Merge pull request '#32: Refactor Database Usage, to be more consistent and understandable' (#33) from task/refactor-dao into main

Reviewed-on: #33
Reviewed-by: SZUT-Ole <ole.kueck@hmmh.de>

.idea/dataSources.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="DataSourceManagerImpl" format="xml" multifile-model="true">
-    <data-source source="LOCAL" name="nursingHome.db" uuid="5a5b8be1-080b-4129-b89d-42f1ea832b90">
+    <data-source source="LOCAL" name="Database" uuid="5a5b8be1-080b-4129-b89d-42f1ea832b90">
       <driver-ref>sqlite.xerial</driver-ref>
       <synchronize>true</synchronize>
       <jdbc-driver>org.sqlite.JDBC</jdbc-driver>

.idea/sqlDataSources.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DdlMappings">
+    <mapping uuid="6de31afe-6f51-4d57-ac29-b95200cc6a68" name="Database Mapping">
+      <data-sources db="5a5b8be1-080b-4129-b89d-42f1ea832b90" ddl="82842a6c-e549-4bc0-9743-9bdb8b472dfc" />
+      <scope>
+        <node negative="1">
+          <node kind="database" negative="1">
+            <node kind="schema" negative="1" />
+          </node>
+          <node kind="schema" qname="main" />
+        </node>
+      </scope>
+    </mapping>
+  </component>
+  <component name="SqlDataSourceStorage">
+    <option name="dataSources">
+      <list>
+        <State>
+          <option name="id" value="82842a6c-e549-4bc0-9743-9bdb8b472dfc" />
+          <option name="name" value="NHPlus DDL" />
+          <option name="dbmsName" value="SQLITE" />
+          <option name="urls">
+            <array>
+              <option value="file://$PROJECT_DIR$/src/main/resources/de/hitec/nhplus/patient/database/Patient.sql" />
+              <option value="file://$PROJECT_DIR$/src/main/resources/de/hitec/nhplus/treatment/database/Treatment.sql" />
+              <option value="file://$PROJECT_DIR$/src/main/resources/de/hitec/nhplus/nurse/database/Nurse.sql" />
+            </array>
+          </option>
+          <option name="outLayout" value="File per object by schema.groovy" />
+        </State>
+      </list>
+    </option>
+  </component>
+</project>

.idea/sqldialects.xml

@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="SqlDialectMappings">
-    <file url="file://$PROJECT_DIR$/src/main/java/de/hitec/nhplus/patient/PatientDao.java" dialect="GenericSQL" />
-    <file url="file://$PROJECT_DIR$/src/main/java/de/hitec/nhplus/treatment/TreatmentDao.java" dialect="GenericSQL" />
+    <file url="file://$PROJECT_DIR$/src/main/java/de/hitec/nhplus/patient/database/PatientDao.java" dialect="GenericSQL" />
+    <file url="file://$PROJECT_DIR$/src/main/java/de/hitec/nhplus/treatment/database/TreatmentDao.java" dialect="GenericSQL" />
+    <file url="file://$PROJECT_DIR$/src/main/java/de/hitec/nhplus/treatment/database/NurseDao.java" dialect="GenericSQL" />
     <file url="PROJECT" dialect="SQLite" />
   </component>
 </project>

src/main/java/de/hitec/nhplus/datastorage/ConnectionBuilder.java

@@ -1,11 +1,17 @@
 package de.hitec.nhplus.datastorage;
 
+import org.sqlite.SQLiteConfig;
+
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.SQLException;
 
-import org.sqlite.SQLiteConfig;
-
+/**
+ * The {@link DaoFactory} allows a safe connection to the Database.
+ *
+ * @author Bernd Heidemann
+ * @version 1.0
+ */
 public class ConnectionBuilder {
 
     private static final String DB_NAME = "nursingHome.db";
@@ -13,6 +19,10 @@ public class ConnectionBuilder {
 
     private static Connection connection;
 
+    /**
+     * @return a Thread-safe {@link Connection} to the Database.
+     * @author Bernd Heidemann
+     */
     synchronized public static Connection getConnection() {
         try {
             if (ConnectionBuilder.connection == null) {
@@ -27,6 +37,11 @@ public class ConnectionBuilder {
         return ConnectionBuilder.connection;
     }
 
+    /**
+     * Closes the Connection to the Database.
+     *
+     * @author Bernd Heidemann
+     */
     synchronized public static void closeConnection() {
         try {
             if (ConnectionBuilder.connection != null) {

src/main/java/de/hitec/nhplus/datastorage/Dao.java

@@ -3,14 +3,52 @@ package de.hitec.nhplus.datastorage;
 import java.sql.SQLException;
 import java.util.List;
 
+/**
+ * {@link Dao} is the Abbreviation of Data-Access-Object.
+ * This Interface has the Basic Methods which are needed on any DAO to work as expected.
+ *
+ * @param <T> The Model for which that DAO is implemented
+ * @author Bernd Heidemann
+ * @version 1.0
+ * @implSpec The Implementations should be added to the {@link DaoFactory}
+ */
 public interface Dao<T> {
+    /**
+     * Create a Database Entry from a Model object.
+     *
+     * @param t the Model instance
+     * @author Bernd Heidemann
+     */
     void create(T t) throws SQLException;
 
+    /**
+     * Read a Database Entry to a Model object.
+     *
+     * @param id of the Element in the Database
+     * @author Bernd Heidemann
+     */
     T read(int id) throws SQLException;
 
+    /**
+     * Read all Database Entries to a {@link List} of Model objects.
+     *
+     * @author Bernd Heidemann
+     */
     List<T> readAll() throws SQLException;
 
+    /**
+     * Update the Database according to the Values of the Model object.
+     *
+     * @param t the Model instance.
+     * @author Bernd Heidemann
+     */
     void update(T t) throws SQLException;
 
-    void deleteById(int id) throws SQLException;
+    /**
+     * Delete a Database Entry.
+     *
+     * @param id of the Element in the Database.
+     * @author Bernd Heidemann
+     */
+    void delete(int id) throws SQLException;
 }

src/main/java/de/hitec/nhplus/datastorage/DaoFactory.java

@@ -1,31 +1,58 @@
 package de.hitec.nhplus.datastorage;
 
-import de.hitec.nhplus.nurse.NurseDao;
-import de.hitec.nhplus.patient.PatientDao;
-import de.hitec.nhplus.treatment.TreatmentDao;
+import de.hitec.nhplus.nurse.database.NurseDao;
+import de.hitec.nhplus.patient.database.PatientDao;
+import de.hitec.nhplus.treatment.database.TreatmentDao;
 
+/**
+ * The {@link DaoFactory} is a Singleton({@link DaoFactory#getInstance}) which should be used to get {@link Dao}s.
+ *
+ * @author Bernd Heidemann
+ * @version 1.0
+ */
 public class DaoFactory {
 
     private static DaoFactory instance;
 
+    /**
+     * A Private Constructor according to the Singleton Pattern.
+     *
+     * @author Bernd Heidemann
+     */
     private DaoFactory() {
     }
 
-    public static DaoFactory getDaoFactory() {
+    /**
+     * @return {@link DaoFactory}, the Singleton Instance
+     * @author Bernd Heidemann
+     */
+    public static DaoFactory getInstance() {
         if (DaoFactory.instance == null) {
             DaoFactory.instance = new DaoFactory();
         }
         return DaoFactory.instance;
     }
 
+    /**
+     * @return a {@link TreatmentDao}
+     * @author Bernd Heidemann
+     */
     public TreatmentDao createTreatmentDao() {
         return new TreatmentDao(ConnectionBuilder.getConnection());
     }
 
+    /**
+     * @return a {@link PatientDao}
+     * @author Bernd Heidemann
+     */
     public PatientDao createPatientDAO() {
         return new PatientDao(ConnectionBuilder.getConnection());
     }
 
+    /**
+     * @return a {@link NurseDao}
+     * @author Dominik Säume
+     */
     public NurseDao createNurseDAO() {
         return new NurseDao(ConnectionBuilder.getConnection());
     }

src/main/java/de/hitec/nhplus/datastorage/DaoImp.java

@@ -1,57 +1,101 @@
 package de.hitec.nhplus.datastorage;
 
-import java.sql.*;
-import java.util.ArrayList;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
 import java.util.List;
 
+/**
+ * The {@link DaoImp} is a Generic Base Implementation of the {@link Dao},
+ * which should fit most use cases.
+ *
+ * @param <T> The Model for which that DAO is implemented
+ * @author Bernd Heidemann
+ * @version 1.0
+ * @implSpec The Implementations should be added to the {@link DaoFactory}
+ */
 public abstract class DaoImp<T> implements Dao<T> {
     protected final Connection connection;
 
+    /**
+     * @param connection a Database Connection, which should be gotten from {@link ConnectionBuilder}
+     * @author Bernd Heidemann
+     */
     public DaoImp(Connection connection) {
         this.connection = connection;
     }
 
+    /**
+     * Creates a new Database Entry from a Model object.
+     *
+     * @param t the Model instance
+     * @author Bernd Heidemann
+     */
     @Override
     public void create(T t) throws SQLException {
         getCreateStatement(t).executeUpdate();
     }
 
+    /**
+     * Read a Database Entry to a Model object.
+     *
+     * @param id of the Element in the Database
+     * @author Bernd Heidemann
+     */
     @Override
-    public T read(int key) throws SQLException {
+    public T read(int id) throws SQLException {
         T object = null;
-        ResultSet result = getReadByIDStatement(key).executeQuery();
+        ResultSet result = getReadByIDStatement(id).executeQuery();
         if (result.next()) {
             object = getInstanceFromResultSet(result);
         }
         return object;
     }
 
+    /**
+     * Read all Database Entries to a {@link List} of Model objects.
+     *
+     * @author Bernd Heidemann
+     */
     @Override
     public List<T> readAll() throws SQLException {
         return getListFromResultSet(getReadAllStatement().executeQuery());
     }
 
+    /**
+     * Update the Database according to the Values of the Model object.
+     *
+     * @param t the Model instance.
+     * @author Bernd Heidemann
+     */
     @Override
     public void update(T t) throws SQLException {
         getUpdateStatement(t).executeUpdate();
     }
 
+    /**
+     * Delete a Database Entry.
+     *
+     * @param id of the Element in the Database.
+     * @author Bernd Heidemann
+     */
     @Override
-    public void deleteById(int key) throws SQLException {
-        getDeleteStatement(key).executeUpdate();
+    public void delete(int id) throws SQLException {
+        getDeleteStatement(id).executeUpdate();
     }
 
-    protected abstract T getInstanceFromResultSet(ResultSet set) throws SQLException;
+    protected abstract T getInstanceFromResultSet(ResultSet result) throws SQLException;
 
-    protected abstract ArrayList<T> getListFromResultSet(ResultSet set) throws SQLException;
+    protected abstract List<T> getListFromResultSet(ResultSet result) throws SQLException;
 
-    protected abstract PreparedStatement getCreateStatement(T t);
+    protected abstract PreparedStatement getCreateStatement(T t) throws SQLException;
 
-    protected abstract PreparedStatement getReadByIDStatement(int key);
+    protected abstract PreparedStatement getReadByIDStatement(int id) throws SQLException;
 
-    protected abstract PreparedStatement getReadAllStatement();
+    protected abstract PreparedStatement getReadAllStatement() throws SQLException;
 
-    protected abstract PreparedStatement getUpdateStatement(T t);
+    protected abstract PreparedStatement getUpdateStatement(T t) throws SQLException;
 
-    protected abstract PreparedStatement getDeleteStatement(int key);
+    protected abstract PreparedStatement getDeleteStatement(int id) throws SQLException;
 }

src/main/java/de/hitec/nhplus/fixtures/Fixture.java

@@ -6,7 +6,7 @@ import java.util.Map;
 
 public interface Fixture<T>
 {
-    void dropTable(Connection connection);
-    void setupTable(Connection connection);
+    void dropTable(Connection connection) throws SQLException;
+    void setupTable(Connection connection) throws SQLException;
     Map<String, T> load() throws SQLException;
 }

src/main/java/de/hitec/nhplus/fixtures/NurseFixture.java

@@ -1,40 +1,28 @@
 package de.hitec.nhplus.fixtures;
 
+import de.hitec.nhplus.Main;
 import de.hitec.nhplus.datastorage.DaoFactory;
-import de.hitec.nhplus.nurse.NurseDao;
 import de.hitec.nhplus.nurse.Nurse;
+import de.hitec.nhplus.nurse.database.NurseDao;
 
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
 import java.sql.Connection;
 import java.sql.SQLException;
-import java.sql.Statement;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
 
 public class NurseFixture implements Fixture<Nurse> {
     @Override
-    public void dropTable(Connection connection) {
-        try (Statement statement = connection.createStatement()) {
-            statement.execute("DROP TABLE nurse");
-        } catch (SQLException exception) {
-            System.out.println(exception.getMessage());
-        }
+    public void dropTable(Connection connection) throws SQLException {
+        connection.createStatement().execute("DROP TABLE nurse");
     }
 
     @Override
-    public void setupTable(Connection connection) {
-        final String SQL = "CREATE TABLE IF NOT EXISTS nurse (" +
-                "id INTEGER PRIMARY KEY AUTOINCREMENT, " +
-                "firstname TEXT NOT NULL, " +
-                "surname TEXT NOT NULL, " +
-                "phoneNumber TEXT NOT NULL" +
-                ");";
-        try (Statement statement = connection.createStatement()) {
-            statement.execute(SQL);
-        } catch (SQLException exception) {
-            System.out.println(exception.getMessage());
-        }
+    public void setupTable(Connection connection) throws SQLException {
+        final InputStream schema = Main.class.getResourceAsStream("/de/hitec/nhplus/nurse/database/Nurse.sql");
+        assert schema != null;
+        final String SQL = new Scanner(schema, StandardCharsets.UTF_8).useDelimiter("\\A").next();
+        connection.createStatement().execute(SQL);
     }
 
     @Override
@@ -52,12 +40,12 @@ public class NurseFixture implements Fixture<Nurse> {
                 "Armout",
                 "9876543210"
         ));
-        NurseDao dao = DaoFactory.getDaoFactory().createNurseDAO();
-        for(Nurse nurse : nurses){
+        NurseDao dao = DaoFactory.getInstance().createNurseDAO();
+        for (Nurse nurse : nurses) {
             dao.create(nurse);
         }
         Map<String, Nurse> nursesByName = new HashMap<>();
-        for (Nurse nurse : dao.readAll()){
+        for (Nurse nurse : dao.readAll()) {
             nursesByName.put(nurse.getFirstName(), nurse);
         }
         return nursesByName;

src/main/java/de/hitec/nhplus/fixtures/PatientFixture.java

@@ -1,107 +1,86 @@
 package de.hitec.nhplus.fixtures;
 
+import de.hitec.nhplus.Main;
 import de.hitec.nhplus.datastorage.DaoFactory;
-import de.hitec.nhplus.patient.PatientDao;
 import de.hitec.nhplus.patient.Patient;
+import de.hitec.nhplus.patient.database.PatientDao;
 
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
 import java.sql.Connection;
 import java.sql.SQLException;
-import java.sql.Statement;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
 
 import static de.hitec.nhplus.utils.DateConverter.convertStringToLocalDate;
 
-public class PatientFixture implements Fixture<Patient>
-{
+public class PatientFixture implements Fixture<Patient> {
     @Override
-    public void dropTable(Connection connection)
-    {
-        try (Statement statement = connection.createStatement())
-        {
-            statement.execute("DROP TABLE patient");
-        } catch (SQLException exception)
-        {
-            System.out.println(exception.getMessage());
-        }
+    public void dropTable(Connection connection) throws SQLException {
+        connection.createStatement().execute("DROP TABLE patient");
     }
 
     @Override
-    public void setupTable(Connection connection)
-    {
-        final String SQL = "CREATE TABLE IF NOT EXISTS patient (" +
-            "   id INTEGER PRIMARY KEY AUTOINCREMENT, " +
-            "   firstname TEXT NOT NULL, " +
-            "   surname TEXT NOT NULL, " +
-            "   dateOfBirth TEXT NOT NULL, " +
-            "   carelevel TEXT NOT NULL, " +
-            "   roomnumber TEXT NOT NULL" +
-            ");";
-        try (Statement statement = connection.createStatement())
-        {
-            statement.execute(SQL);
-        } catch (SQLException exception)
-        {
-            System.out.println(exception.getMessage());
-        }
+    public void setupTable(Connection connection) throws SQLException {
+        // @SuppressWarnings("checkstyle:LineLength")
+        final InputStream schema = Main.class.getResourceAsStream("/de/hitec/nhplus/patient/database/Patient.sql");
+        assert schema != null;
+        final String SQL = new Scanner(schema, StandardCharsets.UTF_8).useDelimiter("\\A").next();
+        connection.createStatement().execute(SQL);
     }
 
     @Override
-    public Map<String, Patient> load() throws SQLException
-    {
+    public Map<String, Patient> load() throws SQLException {
         List<Patient> patients = new ArrayList<>();
 
         patients.add(new Patient(
-            "Seppl",
-            "Herberger",
-            convertStringToLocalDate("1945-12-01"),
-            "4",
-            "202"
+                "Seppl",
+                "Herberger",
+                convertStringToLocalDate("1945-12-01"),
+                "4",
+                "202"
         ));
         patients.add(new Patient(
-            "Martina",
-            "Gerdsen",
-            convertStringToLocalDate("1954-08-12"),
-            "5",
-            "010"
+                "Martina",
+                "Gerdsen",
+                convertStringToLocalDate("1954-08-12"),
+                "5",
+                "010"
         ));
         patients.add(new Patient(
-            "Gertrud",
-            "Franzen",
-            convertStringToLocalDate("1949-04-16"),
-            "3",
-            "002"
+                "Gertrud",
+                "Franzen",
+                convertStringToLocalDate("1949-04-16"),
+                "3",
+                "002"
         ));
         patients.add(new Patient(
-            "Ahmet",
-            "Yilmaz",
-            convertStringToLocalDate("1941-02-22"),
-            "3",
-            "013"
+                "Ahmet",
+                "Yilmaz",
+                convertStringToLocalDate("1941-02-22"),
+                "3",
+                "013"
         ));
         patients.add(new Patient(
-            "Hans",
-            "Neumann",
-            convertStringToLocalDate("1955-12-12"),
-            "2",
-            "001"
+                "Hans",
+                "Neumann",
+                convertStringToLocalDate("1955-12-12"),
+                "2",
+                "001"
         ));
         patients.add(new Patient(
-            "Elisabeth",
-            "Müller",
-            convertStringToLocalDate("1958-03-07"),
-            "5",
-            "110"
+                "Elisabeth",
+                "Müller",
+                convertStringToLocalDate("1958-03-07"),
+                "5",
+                "110"
         ));
 
-        PatientDao dao = DaoFactory.getDaoFactory().createPatientDAO();
-        for (Patient patient : patients){
+        PatientDao dao = DaoFactory.getInstance().createPatientDAO();
+        for (Patient patient : patients) {
             dao.create(patient);
         }
         Map<String, Patient> patientsByName = new HashMap<>();
-        for (Patient patient : dao.readAll()){
+        for (Patient patient : dao.readAll()) {
             patientsByName.put(patient.getFirstName(), patient);
 
         }

src/main/java/de/hitec/nhplus/fixtures/TreatmentFixture.java

@@ -1,68 +1,42 @@
 package de.hitec.nhplus.fixtures;
 
+import de.hitec.nhplus.Main;
 import de.hitec.nhplus.datastorage.DaoFactory;
-import de.hitec.nhplus.treatment.TreatmentDao;
 import de.hitec.nhplus.patient.Patient;
 import de.hitec.nhplus.treatment.Treatment;
+import de.hitec.nhplus.treatment.database.TreatmentDao;
 
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
 import java.sql.Connection;
 import java.sql.SQLException;
-import java.sql.Statement;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
 
 import static de.hitec.nhplus.utils.DateConverter.convertStringToLocalDate;
 import static de.hitec.nhplus.utils.DateConverter.convertStringToLocalTime;
 
-public class TreatmentFixture implements Fixture<Treatment>
-{
+public class TreatmentFixture implements Fixture<Treatment> {
     private final Map<String, Patient> patientsByName;
 
-    public TreatmentFixture(Map<String, Patient> patientsByName)
-    {
+    public TreatmentFixture(Map<String, Patient> patientsByName) {
         this.patientsByName = patientsByName;
     }
 
     @Override
-    public void dropTable(Connection connection)
-    {
-        try (Statement statement = connection.createStatement())
-        {
-            statement.execute("DROP TABLE treatment");
-        } catch (SQLException exception)
-        {
-            System.out.println(exception.getMessage());
-        }
+    public void dropTable(Connection connection) throws SQLException {
+        connection.createStatement().execute("DROP TABLE treatment");
     }
 
     @Override
-    public void setupTable(Connection connection)
-    {
-        final String SQL = "CREATE TABLE IF NOT EXISTS treatment (" +
-            "   id INTEGER PRIMARY KEY AUTOINCREMENT, " +
-            "   patientId INTEGER NOT NULL, " +
-            "   treatment_date TEXT NOT NULL, " +
-            "   begin TEXT NOT NULL, " +
-            "   end TEXT NOT NULL, " +
-            "   description TEXT NOT NULL, " +
-            "   remark TEXT NOT NULL," +
-            "   FOREIGN KEY (patientId) REFERENCES patient (id) ON DELETE CASCADE " +
-            ");";
-
-        try (Statement statement = connection.createStatement())
-        {
-            statement.execute(SQL);
-        } catch (SQLException exception)
-        {
-            System.out.println(exception.getMessage());
-        }
+    public void setupTable(Connection connection) throws SQLException {
+        final InputStream schema = Main.class.getResourceAsStream("/de/hitec/nhplus/treatment/database/Treatment.sql");
+        assert schema != null;
+        final String SQL = new Scanner(schema, StandardCharsets.UTF_8).useDelimiter("\\A").next();
+        connection.createStatement().execute(SQL);
     }
 
     @Override
-    public Map<String, Treatment> load() throws SQLException
-    {
+    public Map<String, Treatment> load() throws SQLException {
         List<Treatment> treatments = new ArrayList<>();
 
         Patient seppl = patientsByName.get("Seppl");
@@ -72,102 +46,102 @@ public class TreatmentFixture implements Fixture<Treatment>
         Patient elisabeth = patientsByName.get("Elisabeth");
 
         treatments.add(new Treatment(
-            1,
-            seppl.getId(),
-            convertStringToLocalDate("2023-06-03"),
-            convertStringToLocalTime("11:00"),
-            convertStringToLocalTime("15:00"),
-            "Gespräch",
-            "Der Patient hat enorme Angstgefühle und glaubt, er sei überfallen worden."
-                + "Ihm seien alle Wertsachen gestohlen worden."
-                + "Patient beruhigt sich erst, als alle Wertsachen im Zimmer gefunden worden sind."
+                1,
+                seppl,
+                convertStringToLocalDate("2023-06-03"),
+                convertStringToLocalTime("11:00"),
+                convertStringToLocalTime("15:00"),
+                "Gespräch",
+                "Der Patient hat enorme Angstgefühle und glaubt, er sei überfallen worden."
+                        + "Ihm seien alle Wertsachen gestohlen worden."
+                        + "Patient beruhigt sich erst, als alle Wertsachen im Zimmer gefunden worden sind."
         ));
         treatments.add(new Treatment(
-            2,
-            seppl.getId(),
-            convertStringToLocalDate("2023-06-05"),
-            convertStringToLocalTime("11:00"),
-            convertStringToLocalTime("12:30"),
-            "Gespräch",
-            "Patient irrt auf der Suche nach gestohlenen Wertsachen durch die Etage "
-                + "und bezichtigt andere Bewohner des Diebstahls."
-                + "Patient wird in seinen Raum zurückbegleitet und erhält Beruhigungsmittel."
+                2,
+                seppl,
+                convertStringToLocalDate("2023-06-05"),
+                convertStringToLocalTime("11:00"),
+                convertStringToLocalTime("12:30"),
+                "Gespräch",
+                "Patient irrt auf der Suche nach gestohlenen Wertsachen durch die Etage "
+                        + "und bezichtigt andere Bewohner des Diebstahls."
+                        + "Patient wird in seinen Raum zurückbegleitet und erhält Beruhigungsmittel."
         ));
         treatments.add(new Treatment(
-            3,
-            martina.getId(),
-            convertStringToLocalDate("2023-06-04"),
-            convertStringToLocalTime("07:30"),
-            convertStringToLocalTime("08:00"),
-            "Waschen",
-            "Patient mit Waschlappen gewaschen und frisch angezogen. Patient gewendet."
+                3,
+                martina,
+                convertStringToLocalDate("2023-06-04"),
+                convertStringToLocalTime("07:30"),
+                convertStringToLocalTime("08:00"),
+                "Waschen",
+                "Patient mit Waschlappen gewaschen und frisch angezogen. Patient gewendet."
         ));
         treatments.add(new Treatment(
-            4,
-            seppl.getId(),
-            convertStringToLocalDate("2023-06-06"),
-            convertStringToLocalTime("15:10"),
-            convertStringToLocalTime("16:00"),
-            "Spaziergang",
-            "Spaziergang im Park, Patient döst  im Rollstuhl ein")
+                4,
+                seppl,
+                convertStringToLocalDate("2023-06-06"),
+                convertStringToLocalTime("15:10"),
+                convertStringToLocalTime("16:00"),
+                "Spaziergang",
+                "Spaziergang im Park, Patient döst  im Rollstuhl ein")
         );
         treatments.add(new Treatment(
-            8,
-            seppl.getId(),
-            convertStringToLocalDate("2023-06-08"),
-            convertStringToLocalTime("15:00"),
-            convertStringToLocalTime("16:00"),
-            "Spaziergang",
-            "Parkspaziergang; Patient ist heute lebhafter und hat klare Momente; erzählt von seiner Tochter")
+                8,
+                seppl,
+                convertStringToLocalDate("2023-06-08"),
+                convertStringToLocalTime("15:00"),
+                convertStringToLocalTime("16:00"),
+                "Spaziergang",
+                "Parkspaziergang; Patient ist heute lebhafter und hat klare Momente; erzählt von seiner Tochter")
         );
         treatments.add(new Treatment(
-            9,
-            martina.getId(),
-            convertStringToLocalDate("2023-06-07"),
-            convertStringToLocalTime("11:00"),
-            convertStringToLocalTime("11:30"),
-            "Waschen",
-            "Waschen per Dusche auf einem Stuhl; Patientin gewendet;")
+                9,
+                martina,
+                convertStringToLocalDate("2023-06-07"),
+                convertStringToLocalTime("11:00"),
+                convertStringToLocalTime("11:30"),
+                "Waschen",
+                "Waschen per Dusche auf einem Stuhl; Patientin gewendet;")
         );
         treatments.add(new Treatment(
-            12,
-            hans.getId(),
-            convertStringToLocalDate("2023-06-08"),
-            convertStringToLocalTime("15:00"),
-            convertStringToLocalTime("15:30"),
-            "Physiotherapie",
-            "Übungen zur Stabilisation und Mobilisierung der Rückenmuskulatur")
+                12,
+                hans,
+                convertStringToLocalDate("2023-06-08"),
+                convertStringToLocalTime("15:00"),
+                convertStringToLocalTime("15:30"),
+                "Physiotherapie",
+                "Übungen zur Stabilisation und Mobilisierung der Rückenmuskulatur")
         );
         treatments.add(new Treatment(
-            14,
-            ahmet.getId(),
-            convertStringToLocalDate("2023-08-24"),
-            convertStringToLocalTime("09:30"),
-            convertStringToLocalTime("10:15"),
-            "KG",
-            "Lympfdrainage"));
+                14,
+                ahmet,
+                convertStringToLocalDate("2023-08-24"),
+                convertStringToLocalTime("09:30"),
+                convertStringToLocalTime("10:15"),
+                "KG",
+                "Lympfdrainage"));
         treatments.add(new Treatment(
-            16,
-            elisabeth.getId(),
-            convertStringToLocalDate("2023-08-31"),
-            convertStringToLocalTime("13:30"),
-            convertStringToLocalTime("13:45"),
-            "Toilettengang",
-            "Hilfe beim Toilettengang; Patientin klagt über Schmerzen beim Stuhlgang. Gabe von Iberogast")
+                16,
+                elisabeth,
+                convertStringToLocalDate("2023-08-31"),
+                convertStringToLocalTime("13:30"),
+                convertStringToLocalTime("13:45"),
+                "Toilettengang",
+                "Hilfe beim Toilettengang; Patientin klagt über Schmerzen beim Stuhlgang. Gabe von Iberogast")
         );
         treatments.add(new Treatment(
-            17,
-            elisabeth.getId(),
-            convertStringToLocalDate("2023-09-01"),
-            convertStringToLocalTime("16:00"),
-            convertStringToLocalTime("17:00"),
-            "KG",
-            "Massage der Extremitäten zur Verbesserung der Durchblutung")
+                17,
+                elisabeth,
+                convertStringToLocalDate("2023-09-01"),
+                convertStringToLocalTime("16:00"),
+                convertStringToLocalTime("17:00"),
+                "KG",
+                "Massage der Extremitäten zur Verbesserung der Durchblutung")
         );
 
-        TreatmentDao dao = DaoFactory.getDaoFactory().createTreatmentDao();
+        TreatmentDao dao = DaoFactory.getInstance().createTreatmentDao();
         Map<String, Treatment> treatmentsById = new HashMap<>();
-        for (Treatment treatment : treatments){
+        for (Treatment treatment : treatments) {
             dao.create(treatment);
             treatmentsById.put(String.valueOf(treatment.getId()), treatment);
         }

src/main/java/de/hitec/nhplus/main/MainWindowController.java

@@ -9,6 +9,7 @@ import javafx.scene.layout.AnchorPane;
 import javafx.scene.layout.BorderPane;
 
 import java.io.IOException;
+import java.util.Objects;
 
 public class MainWindowController {
     @FXML
@@ -40,7 +41,7 @@ public class MainWindowController {
     private void loadPatientPage() {
         try {
             BorderPane patientsPane = FXMLLoader.load(
-                    Main.class.getResource("/de/hitec/nhplus/patient/AllPatientView.fxml")
+                    Objects.requireNonNull(Main.class.getResource("/de/hitec/nhplus/patient/AllPatientView.fxml"))
             );
             patientPage.getChildren().setAll(patientsPane);
             AnchorPane.setTopAnchor(patientsPane, 0d);
@@ -55,7 +56,7 @@ public class MainWindowController {
     private void loadTreatmentsPage() {
         try {
             BorderPane treatmentsPane = FXMLLoader.load(
-                    Main.class.getResource("/de/hitec/nhplus/treatment/AllTreatmentView.fxml")
+                    Objects.requireNonNull(Main.class.getResource("/de/hitec/nhplus/treatment/AllTreatmentView.fxml"))
             );
             treatmentPage.getChildren().setAll(treatmentsPane);
             AnchorPane.setTopAnchor(treatmentsPane, 0d);
@@ -70,7 +71,7 @@ public class MainWindowController {
     private void loadNursePage() {
         try {
             BorderPane nursePane = FXMLLoader.load(
-                    Main.class.getResource("/de/hitec/nhplus/nurse/AllNurseView.fxml")
+                    Objects.requireNonNull(Main.class.getResource("/de/hitec/nhplus/nurse/AllNurseView.fxml"))
             );
             nursePage.getChildren().setAll(nursePane);
             AnchorPane.setTopAnchor(nursePane, 0d);

src/main/java/de/hitec/nhplus/main/Person.java

@@ -4,11 +4,11 @@ import javafx.beans.property.SimpleStringProperty;
 
 public abstract class Person {
     private final SimpleStringProperty firstName;
-    private final SimpleStringProperty surname;
+    private final SimpleStringProperty surName;
 
-    public Person(String firstName, String surname) {
+    public Person(String firstName, String surName) {
         this.firstName = new SimpleStringProperty(firstName);
-        this.surname = new SimpleStringProperty(surname);
+        this.surName = new SimpleStringProperty(surName);
     }
 
     public String getFirstName() {
@@ -23,15 +23,15 @@ public abstract class Person {
         this.firstName.set(firstName);
     }
 
-    public String getSurname() {
-        return surname.get();
+    public String getSurName() {
+        return surName.get();
     }
 
-    public SimpleStringProperty surnameProperty() {
-        return surname;
+    public SimpleStringProperty surNameProperty() {
+        return surName;
     }
 
-    public void setSurname(String surname) {
-        this.surname.set(surname);
+    public void setSurName(String surName) {
+        this.surName.set(surName);
     }
 }

src/main/java/de/hitec/nhplus/nurse/AllNurseController.java

@@ -3,6 +3,7 @@ package de.hitec.nhplus.nurse;
 import static de.hitec.nhplus.utils.Validator.*;
 
 import de.hitec.nhplus.datastorage.DaoFactory;
+import de.hitec.nhplus.nurse.database.NurseDao;
 import javafx.beans.value.ChangeListener;
 import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
@@ -18,9 +19,9 @@ import java.sql.SQLException;
 
 public class AllNurseController {
     @FXML
-    public TextField textFieldSurname;
+    public TextField textFieldSurName;
     @FXML
-    public TextField textFieldFirstname;
+    public TextField textFieldFirstName;
     @FXML
     public TextField textFieldPhoneNumber;
     @FXML
@@ -32,7 +33,7 @@ public class AllNurseController {
     @FXML
     private TableColumn<Nurse, String> columnFirstName;
     @FXML
-    private TableColumn<Nurse, String> columnSurname;
+    private TableColumn<Nurse, String> columnSurName;
     @FXML
     private TableColumn<Nurse, String> columnPhoneNumber;
 
@@ -47,8 +48,8 @@ public class AllNurseController {
         this.columnFirstName.setCellValueFactory(new PropertyValueFactory<>("firstName"));
         this.columnFirstName.setCellFactory(TextFieldTableCell.forTableColumn());
 
-        this.columnSurname.setCellValueFactory(new PropertyValueFactory<>("surname"));
-        this.columnSurname.setCellFactory(TextFieldTableCell.forTableColumn());
+        this.columnSurName.setCellValueFactory(new PropertyValueFactory<>("surName"));
+        this.columnSurName.setCellFactory(TextFieldTableCell.forTableColumn());
 
 
         this.columnPhoneNumber.setCellValueFactory(new PropertyValueFactory<>("phoneNumber"));
@@ -59,21 +60,21 @@ public class AllNurseController {
         this.buttonAdd.setDisable(true);
         ChangeListener<String> inputNewNurseValidationListener = (observableValue, oldText, newText)->
         {
-            boolean isValid = isValidFirstName(this.textFieldFirstname.getText())
-                && isValidSurName(this.textFieldSurname.getText())
+            boolean isValid = isValidFirstName(this.textFieldFirstName.getText())
+                && isValidSurName(this.textFieldSurName.getText())
                 && isValidPhoneNumber(this.textFieldPhoneNumber.getText());
 
             AllNurseController.this.buttonAdd.setDisable(!isValid);
         };
 
-        this.textFieldFirstname.textProperty().addListener(inputNewNurseValidationListener);
-        this.textFieldSurname.textProperty().addListener(inputNewNurseValidationListener);
+        this.textFieldFirstName.textProperty().addListener(inputNewNurseValidationListener);
+        this.textFieldSurName.textProperty().addListener(inputNewNurseValidationListener);
         this.textFieldPhoneNumber.textProperty().addListener(inputNewNurseValidationListener);
     }
 
     private void readAllAndShowInTableView(){
         this.nurses.clear();
-        this.dao = DaoFactory.getDaoFactory().createNurseDAO();
+        this.dao = DaoFactory.getInstance().createNurseDAO();
         try {
             this.nurses.addAll(this.dao.readAll());
         }catch (SQLException exception){
@@ -82,8 +83,8 @@ public class AllNurseController {
     }
     @FXML
     public void handleAdd(){
-        String surname=this.textFieldSurname.getText();
-        String firstName=this.textFieldFirstname.getText();
+        String surname=this.textFieldSurName.getText();
+        String firstName=this.textFieldFirstName.getText();
         String phoneNumber=this.textFieldPhoneNumber.getText();
         try {
             this.dao.create(new Nurse(firstName, surname, phoneNumber));
@@ -96,8 +97,8 @@ public class AllNurseController {
     }
 
     private void clearTextfields() {
-        this.textFieldFirstname.clear();
-        this.textFieldSurname.clear();
+        this.textFieldFirstName.clear();
+        this.textFieldSurName.clear();
         this.textFieldPhoneNumber.clear();
     }
 

src/main/java/de/hitec/nhplus/nurse/Nurse.java

@@ -12,20 +12,20 @@ public class Nurse extends Person {
 
     public Nurse(
             String firstName,
-            String surname,
+            String surName,
             String phoneNumber
     ) {
-        super(firstName, surname);
+        super(firstName, surName);
         this.phoneNumber = new SimpleStringProperty(phoneNumber);
     }
 
     public Nurse(
             int id,
             String firstName,
-            String surname,
+            String surName,
             String phoneNumber
     ) {
-        super(firstName, surname);
+        super(firstName, surName);
         this.id = new SimpleIntegerProperty(id);
         this.phoneNumber = new SimpleStringProperty(phoneNumber);
     }
@@ -55,8 +55,8 @@ public class Nurse extends Person {
         return new StringJoiner(System.lineSeparator())
                 .add("NURSE")
                 .add("ID: " + this.getId())
-                .add("Firstname: " + this.getFirstName())
-                .add("Surname: " + this.getSurname())
+                .add("FirstName: " + this.getFirstName())
+                .add("SurName: " + this.getSurName())
                 .add("PhoneNumber: " + this.getPhoneNumber())
                 .toString();
 

src/main/java/de/hitec/nhplus/nurse/NurseDao.java

@@ -1,115 +0,0 @@
-package de.hitec.nhplus.nurse;
-
-import de.hitec.nhplus.datastorage.DaoImp;
-
-import java.sql.Connection;
-import java.sql.PreparedStatement;
-import java.sql.ResultSet;
-import java.sql.SQLException;
-import java.util.ArrayList;
-
-public class NurseDao extends DaoImp<Nurse> {
-    public NurseDao(Connection connection) {
-        super(connection);
-    }
-
-    @Override
-    protected PreparedStatement getCreateStatement(Nurse nurse) {
-        PreparedStatement preparedStatement = null;
-        try {
-            final String SQL = "INSERT INTO nurse (firstname, surname, phoneNumber)" +
-                    "VALUES (?, ?, ?)";
-            preparedStatement = this.connection.prepareStatement(SQL);
-            preparedStatement.setString(1, nurse.getFirstName());
-            preparedStatement.setString(2, nurse.getSurname());
-            preparedStatement.setString(3, nurse.getPhoneNumber());
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-        return preparedStatement;
-    }
-
-    @Override
-    protected PreparedStatement getReadByIDStatement(int id) {
-        PreparedStatement preparedStatement = null;
-        try {
-            final String SQL = "SELECT * FROM nurse WHERE id = ?";
-            preparedStatement = this.connection.prepareStatement(SQL);
-            preparedStatement.setInt(1, id);
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-        return preparedStatement;
-    }
-
-    @Override
-    protected Nurse getInstanceFromResultSet(ResultSet result) throws SQLException {
-        return new Nurse(
-                result.getInt(1),
-                result.getString(2),
-                result.getString(3),
-                result.getString(4)
-        );
-    }
-
-    @Override
-    protected PreparedStatement getReadAllStatement() {
-        PreparedStatement statement = null;
-        try {
-            final String SQL = "SELECT * FROM nurse";
-            statement = this.connection.prepareStatement(SQL);
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-        return statement;
-    }
-
-    @Override
-    protected ArrayList<Nurse> getListFromResultSet(ResultSet result) throws SQLException {
-        ArrayList<Nurse> list = new ArrayList<>();
-        while (result.next()) {
-            list.add(new Nurse(
-                    result.getInt(1),
-                    result.getString(2),
-                    result.getString(3),
-                    result.getString(4)
-            ));
-        }
-        return list;
-    }
-
-
-    @Override
-    protected PreparedStatement getUpdateStatement(Nurse nurse) {
-        PreparedStatement preparedStatement = null;
-        try {
-            final String SQL =
-                    "UPDATE nurse SET " +
-                            "firstname = ?, " +
-                            "surname = ?, " +
-                            "phoneNumber = ?, " +
-                            "WHERE id = ?";
-            preparedStatement = this.connection.prepareStatement(SQL);
-            preparedStatement.setString(1, nurse.getFirstName());
-            preparedStatement.setString(2, nurse.getSurname());
-            preparedStatement.setString(3, nurse.getPhoneNumber());
-            preparedStatement.setInt(4, nurse.getId());
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-        return preparedStatement;
-    }
-
-    @Override
-    protected PreparedStatement getDeleteStatement(int id) {
-        PreparedStatement preparedStatement = null;
-        try {
-            final String SQL = "DELETE FROM nurse WHERE id = ?";
-            preparedStatement = this.connection.prepareStatement(SQL);
-            preparedStatement.setInt(1, id);
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-        return preparedStatement;
-    }
-}

src/main/java/de/hitec/nhplus/nurse/database/NurseDao.java

@@ -0,0 +1,89 @@
+package de.hitec.nhplus.nurse.database;
+
+import de.hitec.nhplus.datastorage.DaoImp;
+import de.hitec.nhplus.nurse.Nurse;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class NurseDao extends DaoImp<Nurse> {
+    public NurseDao(Connection connection) {
+        super(connection);
+    }
+
+    @Override
+    protected PreparedStatement getCreateStatement(Nurse nurse) throws SQLException {
+        final String SQL = """
+                    INSERT INTO nurse
+                    (firstName, surName, phoneNumber)
+                    VALUES (?, ?, ?)
+                """;
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setString(1, nurse.getFirstName());
+        statement.setString(2, nurse.getSurName());
+        statement.setString(3, nurse.getPhoneNumber());
+        return statement;
+    }
+
+    @Override
+    protected PreparedStatement getReadByIDStatement(int id) throws SQLException {
+        final String SQL = "SELECT * FROM nurse WHERE id = ?";
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setInt(1, id);
+        return statement;
+    }
+
+    @Override
+    protected Nurse getInstanceFromResultSet(ResultSet result) throws SQLException {
+        return new Nurse(
+                result.getInt(1),
+                result.getString(2),
+                result.getString(3),
+                result.getString(4)
+        );
+    }
+
+    @Override
+    protected PreparedStatement getReadAllStatement() throws SQLException {
+        final String SQL = "SELECT * FROM nurse";
+        return this.connection.prepareStatement(SQL);
+    }
+
+    @Override
+    protected List<Nurse> getListFromResultSet(ResultSet result) throws SQLException {
+        ArrayList<Nurse> list = new ArrayList<>();
+        while (result.next()) {
+            list.add(getInstanceFromResultSet(result));
+        }
+        return list;
+    }
+
+    @Override
+    protected PreparedStatement getUpdateStatement(Nurse nurse) throws SQLException {
+        final String SQL = """
+                    UPDATE nurse SET
+                    firstName = ?,
+                    surName = ?,
+                    phoneNumber = ?
+                    WHERE id = ?
+                """;
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setString(1, nurse.getFirstName());
+        statement.setString(2, nurse.getSurName());
+        statement.setString(3, nurse.getPhoneNumber());
+        statement.setInt(4, nurse.getId());
+        return statement;
+    }
+
+    @Override
+    protected PreparedStatement getDeleteStatement(int id) throws SQLException {
+        final String SQL = "DELETE FROM nurse WHERE id = ?";
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setInt(1, id);
+        return statement;
+    }
+}

src/main/java/de/hitec/nhplus/patient/AllPatientController.java

@@ -1,6 +1,7 @@
 package de.hitec.nhplus.patient;
 
 import de.hitec.nhplus.datastorage.DaoFactory;
+import de.hitec.nhplus.patient.database.PatientDao;
 import de.hitec.nhplus.utils.DateConverter;
 import javafx.beans.value.ChangeListener;
 import javafx.collections.FXCollections;
@@ -27,7 +28,7 @@ public class AllPatientController {
     @FXML
     private TableColumn<Patient, String> columnFirstName;
     @FXML
-    private TableColumn<Patient, String> columnSurname;
+    private TableColumn<Patient, String> columnSurName;
     @FXML
     private TableColumn<Patient, String> columnDateOfBirth;
     @FXML
@@ -39,7 +40,7 @@ public class AllPatientController {
     @FXML
     private Button buttonAdd;
     @FXML
-    private TextField textFieldSurname;
+    private TextField textFieldSurName;
     @FXML
     private TextField textFieldFirstName;
     @FXML
@@ -60,8 +61,8 @@ public class AllPatientController {
         this.columnFirstName.setCellValueFactory(new PropertyValueFactory<>("firstName"));
         this.columnFirstName.setCellFactory(TextFieldTableCell.forTableColumn());
 
-        this.columnSurname.setCellValueFactory(new PropertyValueFactory<>("surname"));
-        this.columnSurname.setCellFactory(TextFieldTableCell.forTableColumn());
+        this.columnSurName.setCellValueFactory(new PropertyValueFactory<>("surName"));
+        this.columnSurName.setCellFactory(TextFieldTableCell.forTableColumn());
 
         this.columnDateOfBirth.setCellValueFactory(new PropertyValueFactory<>("dateOfBirth"));
         this.columnDateOfBirth.setCellFactory(TextFieldTableCell.forTableColumn());
@@ -88,7 +89,7 @@ public class AllPatientController {
         {
             boolean isValid = isValidDate(this.textFieldDateOfBirth.getText())
                     && isValidFirstName(this.textFieldFirstName.getText())
-                    && isValidSurName(this.textFieldSurname.getText())
+                    && isValidSurName(this.textFieldSurName.getText())
                     && isValidDate(this.textFieldDateOfBirth.getText())
                     && isValidCareLevel(this.textFieldCareLevel.getText())
                     && isValidRoomNumber(textFieldRoomNumber.getText());
@@ -96,7 +97,7 @@ public class AllPatientController {
             AllPatientController.this.buttonAdd.setDisable(!isValid);
         };
 
-        this.textFieldSurname.textProperty().addListener(inputNewPatientValidationListener);
+        this.textFieldSurName.textProperty().addListener(inputNewPatientValidationListener);
         this.textFieldFirstName.textProperty().addListener(inputNewPatientValidationListener);
         this.textFieldDateOfBirth.textProperty().addListener(inputNewPatientValidationListener);
         this.textFieldCareLevel.textProperty().addListener(inputNewPatientValidationListener);
@@ -123,7 +124,7 @@ public class AllPatientController {
             event.getTableView().refresh();
             return;
         }
-        event.getRowValue().setSurname(newSurName);
+        event.getRowValue().setSurName(newSurName);
         this.doUpdate(event);
     }
 
@@ -174,7 +175,7 @@ public class AllPatientController {
 
     private void readAllAndShowInTableView() {
         this.patients.clear();
-        this.dao = DaoFactory.getDaoFactory().createPatientDAO();
+        this.dao = DaoFactory.getInstance().createPatientDAO();
         try {
             this.patients.addAll(this.dao.readAll());
         } catch (SQLException exception) {
@@ -187,7 +188,7 @@ public class AllPatientController {
         Patient selectedItem = this.tableView.getSelectionModel().getSelectedItem();
         if (selectedItem != null) {
             try {
-                DaoFactory.getDaoFactory().createPatientDAO().deleteById(selectedItem.getId());
+                DaoFactory.getInstance().createPatientDAO().delete(selectedItem.getId());
                 this.tableView.getItems().remove(selectedItem);
             } catch (SQLException exception) {
                 exception.printStackTrace();
@@ -197,7 +198,7 @@ public class AllPatientController {
 
     @FXML
     public void handleAdd() {
-        String surname = this.textFieldSurname.getText();
+        String surname = this.textFieldSurName.getText();
         String firstName = this.textFieldFirstName.getText();
         String birthday = this.textFieldDateOfBirth.getText();
         LocalDate date = DateConverter.convertStringToLocalDate(birthday);
@@ -214,7 +215,7 @@ public class AllPatientController {
 
     private void clearTextfields() {
         this.textFieldFirstName.clear();
-        this.textFieldSurname.clear();
+        this.textFieldSurName.clear();
         this.textFieldDateOfBirth.clear();
         this.textFieldCareLevel.clear();
         this.textFieldRoomNumber.clear();

src/main/java/de/hitec/nhplus/patient/Patient.java

@@ -20,12 +20,12 @@ public class Patient extends Person {
 
     public Patient(
             String firstName,
-            String surname,
+            String surName,
             LocalDate dateOfBirth,
             String careLevel,
             String roomNumber
     ) {
-        super(firstName, surname);
+        super(firstName, surName);
         this.dateOfBirth = new SimpleStringProperty(DateConverter.convertLocalDateToString(dateOfBirth));
         this.careLevel = new SimpleStringProperty(careLevel);
         this.roomNumber = new SimpleStringProperty(roomNumber);
@@ -34,12 +34,12 @@ public class Patient extends Person {
     public Patient(
             int id,
             String firstName,
-            String surname,
+            String surName,
             LocalDate dateOfBirth,
             String careLevel,
             String roomNumber
     ) {
-        super(firstName, surname);
+        super(firstName, surName);
         this.id = new SimpleIntegerProperty(id);
         this.dateOfBirth = new SimpleStringProperty(DateConverter.convertLocalDateToString(dateOfBirth));
         this.careLevel = new SimpleStringProperty(careLevel);
@@ -103,8 +103,8 @@ public class Patient extends Person {
         return new StringJoiner(System.lineSeparator())
                 .add("PATIENT")
                 .add("ID: " + this.getId())
-                .add("Firstname: " + this.getFirstName())
-                .add("Surname: " + this.getSurname())
+                .add("FirstName: " + this.getFirstName())
+                .add("SurName: " + this.getSurName())
                 .add("Birthday: " + this.getDateOfBirth())
                 .add("Carelevel: " + this.getCareLevel())
                 .add("RoomNumber: " + this.getRoomNumber())

src/main/java/de/hitec/nhplus/patient/PatientDao.java

@@ -1,125 +0,0 @@
-package de.hitec.nhplus.patient;
-
-import de.hitec.nhplus.datastorage.DaoImp;
-import de.hitec.nhplus.utils.DateConverter;
-
-import java.sql.Connection;
-import java.sql.PreparedStatement;
-import java.sql.ResultSet;
-import java.sql.SQLException;
-import java.util.ArrayList;
-
-public class PatientDao extends DaoImp<Patient> {
-
-    public PatientDao(Connection connection) {
-        super(connection);
-    }
-
-    @Override
-    protected PreparedStatement getCreateStatement(Patient patient) {
-        PreparedStatement preparedStatement = null;
-        try {
-            final String SQL = "INSERT INTO patient (firstname, surname, dateOfBirth, carelevel, roomnumber) " +
-                    "VALUES (?, ?, ?, ?, ?)";
-            preparedStatement = this.connection.prepareStatement(SQL);
-            preparedStatement.setString(1, patient.getFirstName());
-            preparedStatement.setString(2, patient.getSurname());
-            preparedStatement.setString(3, patient.getDateOfBirth());
-            preparedStatement.setString(4, patient.getCareLevel());
-            preparedStatement.setString(5, patient.getRoomNumber());
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-        return preparedStatement;
-    }
-
-    @Override
-    protected PreparedStatement getReadByIDStatement(int id) {
-        PreparedStatement preparedStatement = null;
-        try {
-            final String SQL = "SELECT * FROM patient WHERE id = ?";
-            preparedStatement = this.connection.prepareStatement(SQL);
-            preparedStatement.setInt(1, id);
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-        return preparedStatement;
-    }
-
-    @Override
-    protected Patient getInstanceFromResultSet(ResultSet result) throws SQLException {
-        return new Patient(
-                result.getInt(1),
-                result.getString(2),
-                result.getString(3),
-                DateConverter.convertStringToLocalDate(result.getString(4)),
-                result.getString(5),
-                result.getString(6));
-    }
-
-    @Override
-    protected PreparedStatement getReadAllStatement() {
-        PreparedStatement statement = null;
-        try {
-            final String SQL = "SELECT * FROM patient";
-            statement = this.connection.prepareStatement(SQL);
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-        return statement;
-    }
-
-    @Override
-    protected ArrayList<Patient> getListFromResultSet(ResultSet result) throws SQLException {
-        ArrayList<Patient> list = new ArrayList<>();
-        while (result.next()) {
-            Patient patient = new Patient(
-                    result.getInt(1),
-                    result.getString(2),
-                    result.getString(3),
-                    DateConverter.convertStringToLocalDate(result.getString(4)),
-                    result.getString(5),
-                    result.getString(6));
-            list.add(patient);
-        }
-        return list;
-    }
-
-    @Override
-    protected PreparedStatement getUpdateStatement(Patient patient) {
-        PreparedStatement preparedStatement = null;
-        try {
-            final String SQL =
-                    "UPDATE patient SET " +
-                            "firstname = ?, " +
-                            "surname = ?, " +
-                            "dateOfBirth = ?, " +
-                            "carelevel = ?, " +
-                            "roomnumber = ?, " +
-                            "WHERE id = ?";
-            preparedStatement = this.connection.prepareStatement(SQL);
-            preparedStatement.setString(1, patient.getFirstName());
-            preparedStatement.setString(2, patient.getSurname());
-            preparedStatement.setString(3, patient.getDateOfBirth());
-            preparedStatement.setString(4, patient.getCareLevel());
-            preparedStatement.setString(5, patient.getRoomNumber());
-            preparedStatement.setInt(6, patient.getId());
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-        return preparedStatement;
-    }
-
-    @Override
-    protected PreparedStatement getDeleteStatement(int id) {
-        PreparedStatement preparedStatement = null;
-        try {
-            final String SQL = "DELETE FROM patient WHERE id = ?";
-            preparedStatement = this.connection.prepareStatement(SQL);
-            preparedStatement.setInt(1, id);
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-        return preparedStatement;
-    }
-}

src/main/java/de/hitec/nhplus/patient/database/PatientDao.java

@@ -0,0 +1,98 @@
+package de.hitec.nhplus.patient.database;
+
+import de.hitec.nhplus.datastorage.DaoImp;
+import de.hitec.nhplus.patient.Patient;
+import de.hitec.nhplus.utils.DateConverter;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class PatientDao extends DaoImp<Patient> {
+
+    public PatientDao(Connection connection) {
+        super(connection);
+    }
+
+    @Override
+    protected PreparedStatement getCreateStatement(Patient patient) throws SQLException {
+        final String SQL = """
+                    INSERT INTO patient
+                    (firstName, surName, dateOfBirth, careLevel, roomNumber)
+                    VALUES (?, ?, ?, ?, ?)
+                """;
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setString(1, patient.getFirstName());
+        statement.setString(2, patient.getSurName());
+        statement.setString(3, patient.getDateOfBirth());
+        statement.setString(4, patient.getCareLevel());
+        statement.setString(5, patient.getRoomNumber());
+        return statement;
+    }
+
+    @Override
+    protected PreparedStatement getReadByIDStatement(int id) throws SQLException {
+        final String SQL = "SELECT * FROM patient WHERE id = ?";
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setInt(1, id);
+        return statement;
+    }
+
+    @Override
+    protected Patient getInstanceFromResultSet(ResultSet result) throws SQLException {
+        return new Patient(
+                result.getInt(1),
+                result.getString(2),
+                result.getString(3),
+                DateConverter.convertStringToLocalDate(result.getString(4)),
+                result.getString(5),
+                result.getString(6));
+    }
+
+    @Override
+    protected PreparedStatement getReadAllStatement() throws SQLException {
+        final String SQL = "SELECT * FROM patient";
+        return this.connection.prepareStatement(SQL);
+    }
+
+    @Override
+    protected List<Patient> getListFromResultSet(ResultSet result) throws SQLException {
+        ArrayList<Patient> list = new ArrayList<>();
+        while (result.next()) {
+            list.add(getInstanceFromResultSet(result));
+        }
+        return list;
+    }
+
+    @Override
+    protected PreparedStatement getUpdateStatement(Patient patient) throws SQLException {
+        final String SQL = """
+                    UPDATE patient SET
+                    firstName = ?,
+                    surName = ?,
+                    dateOfBirth = ?,
+                    careLevel = ?,
+                    roomNumber = ?,
+                    WHERE id = ?
+                """;
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setString(1, patient.getFirstName());
+        statement.setString(2, patient.getSurName());
+        statement.setString(3, patient.getDateOfBirth());
+        statement.setString(4, patient.getCareLevel());
+        statement.setString(5, patient.getRoomNumber());
+        statement.setInt(6, patient.getId());
+        return statement;
+    }
+
+    @Override
+    protected PreparedStatement getDeleteStatement(int id) throws SQLException {
+        final String SQL = "DELETE FROM patient WHERE id = ?";
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setInt(1, id);
+        return statement;
+    }
+}

src/main/java/de/hitec/nhplus/treatment/AllTreatmentController.java

@@ -3,7 +3,9 @@ package de.hitec.nhplus.treatment;
 import de.hitec.nhplus.Main;
 import de.hitec.nhplus.datastorage.DaoFactory;
 import de.hitec.nhplus.patient.Patient;
-import de.hitec.nhplus.patient.PatientDao;
+import de.hitec.nhplus.patient.database.PatientDao;
+import de.hitec.nhplus.treatment.database.TreatmentDao;
+import javafx.beans.property.SimpleStringProperty;
 import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
 import javafx.fxml.FXML;
@@ -27,7 +29,7 @@ public class AllTreatmentController {
     private TableColumn<Treatment, Integer> columnId;
 
     @FXML
-    private TableColumn<Treatment, Integer> columnPatientId;
+    private TableColumn<Treatment, String> columnPatientName;
 
     @FXML
     private TableColumn<Treatment, String> columnDate;
@@ -58,7 +60,12 @@ public class AllTreatmentController {
         comboBoxPatientSelection.getSelectionModel().select(0);
 
         this.columnId.setCellValueFactory(new PropertyValueFactory<>("id"));
-        this.columnPatientId.setCellValueFactory(new PropertyValueFactory<>("patientId"));
+        this.columnPatientName.setCellValueFactory(
+                cellData ->  {
+                    Patient patient = cellData.getValue().getPatient();
+                    return new SimpleStringProperty(patient.getSurName() + ", " + patient.getFirstName());
+                }
+        );
         this.columnDate.setCellValueFactory(new PropertyValueFactory<>("date"));
         this.columnBegin.setCellValueFactory(new PropertyValueFactory<>("begin"));
         this.columnEnd.setCellValueFactory(new PropertyValueFactory<>("end"));
@@ -78,7 +85,7 @@ public class AllTreatmentController {
 
     public void readAllAndShowInTableView() {
         comboBoxPatientSelection.getSelectionModel().select(0);
-        this.dao = DaoFactory.getDaoFactory().createTreatmentDao();
+        this.dao = DaoFactory.getInstance().createTreatmentDao();
         try {
             this.treatments.setAll(dao.readAll());
         } catch (SQLException exception) {
@@ -87,12 +94,12 @@ public class AllTreatmentController {
     }
 
     private void createComboBoxData() {
-        PatientDao dao = DaoFactory.getDaoFactory().createPatientDAO();
+        PatientDao dao = DaoFactory.getInstance().createPatientDAO();
         try {
             patientList = (ArrayList<Patient>) dao.readAll();
             this.patientSelection.add("alle");
             for (Patient patient : patientList) {
-                this.patientSelection.add(patient.getSurname());
+                this.patientSelection.add(patient.getSurName());
             }
         } catch (SQLException exception) {
             exception.printStackTrace();
@@ -104,7 +111,7 @@ public class AllTreatmentController {
     public void handleComboBox() {
         String selectedPatient = this.comboBoxPatientSelection.getSelectionModel().getSelectedItem();
         this.treatments.clear();
-        this.dao = DaoFactory.getDaoFactory().createTreatmentDao();
+        this.dao = DaoFactory.getInstance().createTreatmentDao();
 
         if (selectedPatient.equals("alle")) {
             try {
@@ -126,7 +133,7 @@ public class AllTreatmentController {
 
     private Patient searchInList(String surname) {
         for (Patient patient : this.patientList) {
-            if (patient.getSurname().equals(surname)) {
+            if (patient.getSurName().equals(surname)) {
                 return patient;
             }
         }
@@ -137,9 +144,9 @@ public class AllTreatmentController {
     public void handleDelete() {
         int index = this.tableView.getSelectionModel().getSelectedIndex();
         Treatment t = this.treatments.remove(index);
-        TreatmentDao dao = DaoFactory.getDaoFactory().createTreatmentDao();
+        TreatmentDao dao = DaoFactory.getInstance().createTreatmentDao();
         try {
-            dao.deleteById(t.getId());
+            dao.delete(t.getId());
         } catch (SQLException exception) {
             exception.printStackTrace();
         }
@@ -209,12 +216,12 @@ public class AllTreatmentController {
             Stage stage = new Stage();
 
             TreatmentModalController controller = loader.getController();
-            PatientDao pDao = DaoFactory.getDaoFactory().createPatientDAO();
+            PatientDao pDao = DaoFactory.getInstance().createPatientDAO();
             controller.initialize(
                     this,
                     stage,
                     treatment,
-                    pDao.read(treatment.getPatientId())
+                    pDao.read(treatment.getPatient().getId())
             );
 
             stage.setScene(scene);
@@ -228,7 +235,7 @@ public class AllTreatmentController {
     }
 
     public void createTreatment(Treatment treatment) {
-        TreatmentDao dao = DaoFactory.getDaoFactory().createTreatmentDao();
+        TreatmentDao dao = DaoFactory.getInstance().createTreatmentDao();
         try {
             dao.create(treatment);
         } catch (SQLException exception) {
@@ -237,7 +244,7 @@ public class AllTreatmentController {
     }
 
     public void updateTreatment(Treatment treatment) {
-        TreatmentDao dao = DaoFactory.getDaoFactory().createTreatmentDao();
+        TreatmentDao dao = DaoFactory.getInstance().createTreatmentDao();
         try {
             dao.update(treatment);
         } catch (SQLException exception) {

src/main/java/de/hitec/nhplus/treatment/Treatment.java

@@ -1,94 +1,122 @@
 package de.hitec.nhplus.treatment;
 
+import de.hitec.nhplus.patient.Patient;
 import de.hitec.nhplus.utils.DateConverter;
+import javafx.beans.property.SimpleIntegerProperty;
+import javafx.beans.property.SimpleObjectProperty;
+import javafx.beans.property.SimpleStringProperty;
 
 import java.time.LocalDate;
 import java.time.LocalTime;
 import java.util.StringJoiner;
 
 public class Treatment {
-    private int id;
-    private final int patientId;
-    private LocalDate date;
-    private LocalTime begin;
-    private LocalTime end;
-    private String description;
-    private String remarks;
+    private SimpleIntegerProperty id;
+    private final SimpleObjectProperty<Patient> patient;
+    private final SimpleObjectProperty<LocalDate> date;
+    private final SimpleObjectProperty<LocalTime> begin;
+    private final SimpleObjectProperty<LocalTime> end;
+    private final SimpleStringProperty description;
+    private final SimpleStringProperty remarks;
 
-    public Treatment(int patientId, LocalDate date, LocalTime begin,
+    public Treatment(Patient patient, LocalDate date, LocalTime begin,
                      LocalTime end, String description, String remarks) {
-        this.patientId = patientId;
-        this.date = date;
-        this.begin = begin;
-        this.end = end;
-        this.description = description;
-        this.remarks = remarks;
+        this.patient = new SimpleObjectProperty<>(patient);
+        this.date = new SimpleObjectProperty<>(date);
+        this.begin = new SimpleObjectProperty<>(begin);
+        this.end = new SimpleObjectProperty<>(end);
+        this.description = new SimpleStringProperty(description);
+        this.remarks = new SimpleStringProperty(remarks);
     }
 
-    public Treatment(int id, int patientId, LocalDate date, LocalTime begin,
+    public Treatment(int id, Patient patient, LocalDate date, LocalTime begin,
                      LocalTime end, String description, String remarks) {
-        this.id = id;
-        this.patientId = patientId;
-        this.date = date;
-        this.begin = begin;
-        this.end = end;
-        this.description = description;
-        this.remarks = remarks;
+        this.id = new SimpleIntegerProperty(id);
+        this.patient = new SimpleObjectProperty<>(patient);
+        this.date = new SimpleObjectProperty<>(date);
+        this.begin = new SimpleObjectProperty<>(begin);
+        this.end = new SimpleObjectProperty<>(end);
+        this.description = new SimpleStringProperty(description);
+        this.remarks = new SimpleStringProperty(remarks);
     }
 
     public int getId() {
-        return id;
+        return id.getValue();
     }
 
-    public int getPatientId() {
-        return this.patientId;
+    public Patient getPatient() {
+        return patient.getValue();
     }
 
     public String getDate() {
-        return date.toString();
+        return date.getValue().toString();
     }
 
     public String getBegin() {
-        return begin.toString();
+        return begin.getValue().toString();
     }
 
     public String getEnd() {
-        return end.toString();
+        return end.getValue().toString();
     }
 
     public void setDate(String date) {
-        this.date = DateConverter.convertStringToLocalDate(date);
+        this.date.set(DateConverter.convertStringToLocalDate(date));
     }
 
     public void setBegin(LocalTime begin) {
-        this.begin = begin;
+        this.begin.set(begin);
     }
 
     public void setEnd(LocalTime end) {
-        this.end = end;
+        this.end.set(end);
     }
 
     public String getDescription() {
-        return description;
+        return description.getValue();
     }
 
     public void setDescription(String description) {
-        this.description = description;
+        this.description.set(description);
     }
 
     public String getRemarks() {
+        return remarks.getValue();
+    }
+
+    public SimpleObjectProperty<Patient> patientProperty() {
+        return patient;
+    }
+
+    public SimpleObjectProperty<LocalDate> dateProperty() {
+        return date;
+    }
+
+    public SimpleObjectProperty<LocalTime> beginProperty() {
+        return begin;
+    }
+
+    public SimpleObjectProperty<LocalTime> endProperty() {
+        return end;
+    }
+
+    public SimpleStringProperty descriptionProperty() {
+        return description;
+    }
+
+    public SimpleStringProperty remarksProperty() {
         return remarks;
     }
 
     public void setRemarks(String remarks) {
-        this.remarks = remarks;
+        this.remarks.set(remarks);
     }
 
     public String toString() {
         return new StringJoiner(System.lineSeparator())
                 .add("TREATMENT")
                 .add("ID: " + this.getId())
-                .add("PatientID: " + this.getPatientId())
+                .add("Patient: " + this.getPatient().getSurName() + ", " + this.getPatient().getFirstName())
                 .add("Date: " + this.getDate())
                 .add("Begin: " + this.getBegin())
                 .add("End: " + this.getEnd())

src/main/java/de/hitec/nhplus/treatment/TreatmentDao.java

@@ -1,151 +0,0 @@
-package de.hitec.nhplus.treatment;
-
-import de.hitec.nhplus.datastorage.DaoImp;
-import de.hitec.nhplus.utils.DateConverter;
-
-import java.sql.Connection;
-import java.sql.PreparedStatement;
-import java.sql.ResultSet;
-import java.sql.SQLException;
-import java.util.ArrayList;
-import java.util.List;
-
-public class TreatmentDao extends DaoImp<Treatment> {
-
-    public TreatmentDao(Connection connection) {
-        super(connection);
-    }
-
-    @Override
-    protected PreparedStatement getCreateStatement(Treatment treatment) {
-        PreparedStatement preparedStatement = null;
-        try {
-            final String SQL = "INSERT INTO treatment (patientId, treatment_date, begin, end, description, remark) " +
-                    "VALUES (?, ?, ?, ?, ?, ?)";
-            preparedStatement = this.connection.prepareStatement(SQL);
-            preparedStatement.setInt(1, treatment.getPatientId());
-            preparedStatement.setString(2, treatment.getDate());
-            preparedStatement.setString(3, treatment.getBegin());
-            preparedStatement.setString(4, treatment.getEnd());
-            preparedStatement.setString(5, treatment.getDescription());
-            preparedStatement.setString(6, treatment.getRemarks());
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-        return preparedStatement;
-    }
-
-    @Override
-    protected PreparedStatement getReadByIDStatement(int id) {
-        PreparedStatement preparedStatement = null;
-        try {
-            final String SQL = "SELECT * FROM treatment WHERE id = ?";
-            preparedStatement = this.connection.prepareStatement(SQL);
-            preparedStatement.setInt(1, id);
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-        return preparedStatement;
-    }
-
-    @Override
-    protected Treatment getInstanceFromResultSet(ResultSet result) throws SQLException {
-        return new Treatment(
-                result.getInt(1),
-                result.getInt(2),
-                DateConverter.convertStringToLocalDate(result.getString(3)),
-                DateConverter.convertStringToLocalTime(result.getString(4)),
-                DateConverter.convertStringToLocalTime(result.getString(5)),
-                result.getString(6),
-                result.getString(7)
-        );
-    }
-
-    @Override
-    protected PreparedStatement getReadAllStatement() {
-        PreparedStatement statement = null;
-        try {
-            final String SQL = "SELECT * FROM treatment";
-            statement = this.connection.prepareStatement(SQL);
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-        return statement;
-    }
-
-    @Override
-    protected ArrayList<Treatment> getListFromResultSet(ResultSet result) throws SQLException {
-        ArrayList<Treatment> list = new ArrayList<>();
-        while (result.next()) {
-            Treatment treatment = new Treatment(
-                    result.getInt(1),
-                    result.getInt(2),
-                    DateConverter.convertStringToLocalDate(result.getString(3)),
-                    DateConverter.convertStringToLocalTime(result.getString(4)),
-                    DateConverter.convertStringToLocalTime(result.getString(5)),
-                    result.getString(6),
-                    result.getString(7)
-            );
-            list.add(treatment);
-        }
-        return list;
-    }
-
-    private PreparedStatement getReadAllTreatmentsOfOnePatientByPid(int patientId) {
-        PreparedStatement preparedStatement = null;
-        try {
-            final String SQL = "SELECT * FROM treatment WHERE patientId = ?";
-            preparedStatement = this.connection.prepareStatement(SQL);
-            preparedStatement.setInt(1, patientId);
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-        return preparedStatement;
-    }
-
-    public List<Treatment> readTreatmentsByPid(int patientId) throws SQLException {
-        ResultSet result = getReadAllTreatmentsOfOnePatientByPid(patientId).executeQuery();
-        return getListFromResultSet(result);
-    }
-
-    @Override
-    protected PreparedStatement getUpdateStatement(Treatment treatment) {
-        PreparedStatement preparedStatement = null;
-        try {
-            final String SQL =
-                    "UPDATE treatment SET " +
-                            "patientId = ?, " +
-                            "treatment_date = ?, " +
-                            "begin = ?, " +
-                            "end = ?, " +
-                            "description = ?, " +
-                            "remark = ? " +
-                            "WHERE id = ?";
-            preparedStatement = this.connection.prepareStatement(SQL);
-            preparedStatement.setInt(1, treatment.getPatientId());
-            preparedStatement.setString(2, treatment.getDate());
-            preparedStatement.setString(3, treatment.getBegin());
-            preparedStatement.setString(4, treatment.getEnd());
-            preparedStatement.setString(5, treatment.getDescription());
-            preparedStatement.setString(6, treatment.getRemarks());
-            preparedStatement.setInt(7, treatment.getId());
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-        return preparedStatement;
-    }
-
-    @Override
-    protected PreparedStatement getDeleteStatement(int id) {
-        PreparedStatement preparedStatement = null;
-        try {
-            final String SQL =
-                    "DELETE FROM treatment WHERE id = ?";
-            preparedStatement = this.connection.prepareStatement(SQL);
-            preparedStatement.setInt(1, id);
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-        return preparedStatement;
-    }
-}

src/main/java/de/hitec/nhplus/treatment/TreatmentModalController.java

@@ -17,7 +17,7 @@ public class TreatmentModalController {
     @FXML
     private Label labelFirstName;
     @FXML
-    private Label labelSurname;
+    private Label labelSurName;
     @FXML
     private TextField textFieldBegin;
     @FXML
@@ -44,7 +44,7 @@ public class TreatmentModalController {
             isNewTreatment = true;
             LocalTime currentTime = LocalTime.now();
             this.treatment = new Treatment(
-                    patient.getId(),
+                    patient,
                     LocalDate.now(),
                     LocalTime.of(currentTime.getHour(), currentTime.getMinute()),
                     LocalTime.of(currentTime.getHour(), currentTime.getMinute()),
@@ -99,7 +99,7 @@ public class TreatmentModalController {
 
     private void showData() {
         this.labelFirstName.setText(patient.getFirstName());
-        this.labelSurname.setText(patient.getSurname());
+        this.labelSurName.setText(patient.getSurName());
         LocalDate date = DateConverter.convertStringToLocalDate(treatment.getDate());
         this.datePicker.setValue(date);
         this.textFieldBegin.setText(this.treatment.getBegin());

src/main/java/de/hitec/nhplus/treatment/database/TreatmentDao.java

@@ -0,0 +1,117 @@
+package de.hitec.nhplus.treatment.database;
+
+import de.hitec.nhplus.datastorage.DaoFactory;
+import de.hitec.nhplus.datastorage.DaoImp;
+import de.hitec.nhplus.treatment.Treatment;
+import de.hitec.nhplus.utils.DateConverter;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class TreatmentDao extends DaoImp<Treatment> {
+
+    public TreatmentDao(Connection connection) {
+        super(connection);
+    }
+
+    @Override
+    protected PreparedStatement getCreateStatement(Treatment treatment) throws SQLException {
+        final String SQL = """
+                    INSERT INTO treatment
+                    (patientId, date, begin, end, description, remark)
+                    VALUES (?, ?, ?, ?, ?, ?)
+                """;
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setInt(1, treatment.getPatient().getId());
+        statement.setString(2, treatment.getDate());
+        statement.setString(3, treatment.getBegin());
+        statement.setString(4, treatment.getEnd());
+        statement.setString(5, treatment.getDescription());
+        statement.setString(6, treatment.getRemarks());
+        return statement;
+    }
+
+    @Override
+    protected PreparedStatement getReadByIDStatement(int id) throws SQLException {
+        final String SQL = "SELECT * FROM treatment WHERE id = ?";
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setInt(1, id);
+        return statement;
+    }
+
+    @Override
+    protected Treatment getInstanceFromResultSet(ResultSet result) throws SQLException {
+        return new Treatment(
+                result.getInt(1),
+                DaoFactory.getInstance().createPatientDAO().read(result.getInt(2)),
+                DateConverter.convertStringToLocalDate(result.getString(3)),
+                DateConverter.convertStringToLocalTime(result.getString(4)),
+                DateConverter.convertStringToLocalTime(result.getString(5)),
+                result.getString(6),
+                result.getString(7)
+        );
+    }
+
+    @Override
+    protected PreparedStatement getReadAllStatement() throws SQLException {
+        final String SQL = "SELECT * FROM treatment";
+        return this.connection.prepareStatement(SQL);
+    }
+
+    @Override
+    protected List<Treatment> getListFromResultSet(ResultSet result) throws SQLException {
+        ArrayList<Treatment> list = new ArrayList<>();
+        while (result.next()) {
+            list.add(getInstanceFromResultSet(result));
+        }
+        return list;
+    }
+
+    private PreparedStatement getReadAllTreatmentsOfOnePatientByPid(int patientId) throws SQLException {
+        final String SQL = "SELECT * FROM treatment WHERE patientId = ?";
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setInt(1, patientId);
+        return statement;
+    }
+
+    public List<Treatment> readTreatmentsByPid(int patientId) throws SQLException {
+        ResultSet result = getReadAllTreatmentsOfOnePatientByPid(patientId).executeQuery();
+        return getListFromResultSet(result);
+    }
+
+    @Override
+    protected PreparedStatement getUpdateStatement(Treatment treatment) throws SQLException {
+        final String SQL = """
+                   UPDATE treatment SET
+                   patientId = ?,
+                   date = ?,
+                   begin = ?,
+                   end = ?,
+                   description = ?,
+                   remark = ?
+                   WHERE id = ?
+                """;
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setInt(1, treatment.getPatient().getId());
+        statement.setString(2, treatment.getDate());
+        statement.setString(3, treatment.getBegin());
+        statement.setString(4, treatment.getEnd());
+        statement.setString(5, treatment.getDescription());
+        statement.setString(6, treatment.getRemarks());
+        statement.setInt(7, treatment.getId());
+        return statement;
+    }
+
+    @Override
+    protected PreparedStatement getDeleteStatement(int id) throws SQLException {
+        final String SQL =
+                "DELETE FROM treatment WHERE id = ?";
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setInt(1, id);
+        return statement;
+    }
+}

src/main/java/module-info.java

@@ -11,11 +11,17 @@ module de.hitec.nhplus {
     opens de.hitec.nhplus.main to javafx.base, javafx.fxml;
 
     exports de.hitec.nhplus.patient;
+    exports de.hitec.nhplus.patient.database;
+    opens de.hitec.nhplus.patient.database to javafx.base, javafx.fxml;
     opens de.hitec.nhplus.patient to javafx.base, javafx.fxml;
 
     exports de.hitec.nhplus.treatment;
+    exports de.hitec.nhplus.treatment.database;
     opens de.hitec.nhplus.treatment to javafx.base, javafx.fxml;
+    opens de.hitec.nhplus.treatment.database to javafx.base, javafx.fxml;
 
     exports de.hitec.nhplus.nurse;
+    exports de.hitec.nhplus.nurse.database;
     opens de.hitec.nhplus.nurse to javafx.base, javafx.fxml;
+    opens de.hitec.nhplus.nurse.database to javafx.base, javafx.fxml;
 }

src/main/resources/de/hitec/nhplus/nurse/AllNurseView.fxml

@@ -20,7 +20,7 @@
                         text="ID"
                 />
                 <TableColumn
-                        fx:id="columnSurname"
+                        fx:id="columnSurName"
                         minWidth="140.0"
                         text="Nachname"
                 />
@@ -51,12 +51,12 @@
                         <Insets right="8.0"/>
                     </padding>
                     <TextField
-                            fx:id="textFieldSurname"
+                            fx:id="textFieldSurName"
                             prefWidth="200.0"
                             promptText="Nachname"
                     />
                     <TextField
-                            fx:id="textFieldFirstname"
+                            fx:id="textFieldFirstName"
                             prefWidth="200.0"
                             promptText="Vorname"
                     />

src/main/resources/de/hitec/nhplus/nurse/database/Nurse.sql

@@ -0,0 +1,7 @@
+CREATE TABLE nurse
+(
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    firstName   TEXT NOT NULL,
+    surName     TEXT NOT NULL,
+    phoneNumber TEXT NOT NULL
+)

src/main/resources/de/hitec/nhplus/patient/AllPatientView.fxml

@@ -23,7 +23,7 @@
                         text="ID"
                 />
                 <TableColumn
-                        fx:id="columnSurname"
+                        fx:id="columnSurName"
                         minWidth="140.0"
                         onEditCommit="#handleOnEditSurname"
                         text="Nachname"
@@ -90,7 +90,7 @@
                             GridPane.rowIndex="0"
                             GridPane.columnIndex="1"
                             prefWidth="200.0"
-                            fx:id="textFieldSurname"
+                            fx:id="textFieldSurName"
                             promptText="Nachname"
                     />
                     <TextField

src/main/resources/de/hitec/nhplus/patient/database/Patient.sql

@@ -0,0 +1,9 @@
+CREATE TABLE patient
+(
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    firstName   TEXT NOT NULL,
+    surName     TEXT NOT NULL,
+    dateOfBirth TEXT NOT NULL,
+    careLevel   TEXT NOT NULL,
+    roomNumber  TEXT NOT NULL
+);

src/main/resources/de/hitec/nhplus/treatment/AllTreatmentView.fxml

@@ -24,9 +24,9 @@
                         text="ID"
                 />
                 <TableColumn
-                        fx:id="columnPatientId"
-                        minWidth="40.0"
-                        text="PatientID"
+                        fx:id="columnPatientName"
+                        minWidth="80.0"
+                        text="Patient"
                 />
                 <TableColumn
                         fx:id="columnDate"

src/main/resources/de/hitec/nhplus/treatment/TreatmentModal.fxml

@@ -47,7 +47,7 @@
                     GridPane.rowIndex="0"
                     GridPane.columnIndex="4"
                     prefWidth="200"
-                    fx:id="labelSurname"
+                    fx:id="labelSurName"
                     text="Nachname"
             />
             <!-- Row 2 -->

src/main/resources/de/hitec/nhplus/treatment/database/Treatment.sql

@@ -0,0 +1,11 @@
+CREATE TABLE treatment
+(
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    patientId   INTEGER NOT NULL,
+    date        TEXT    NOT NULL,
+    begin       TEXT    NOT NULL,
+    end         TEXT    NOT NULL,
+    description TEXT    NOT NULL,
+    remark      TEXT    NOT NULL,
+    FOREIGN KEY (patientId) REFERENCES patient (id) ON DELETE CASCADE
+)