added some basic methods

pom.xml

@@ -20,6 +20,11 @@
             <artifactId>javafx-controls</artifactId>
             <version>17.0.6</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.derby</groupId>
+            <artifactId>derby</artifactId>
+            <version>10.17.1.0</version>
+        </dependency>
         <dependency>
             <groupId>org.openjfx</groupId>
             <artifactId>javafx-fxml</artifactId>

src/main/java/at/ionas999/health/services/DatabaseUtilsBase.java

@@ -0,0 +1,39 @@
+package at.ionas999.health.services;
+
+import java.sql.*;
+import java.util.ArrayList;
+
+public abstract class DatabaseUtilsBase {
+
+    private static final String connectionString = "jdbc:derby:DerbyDb;create=true";
+    protected ArrayList<TableCreation> tableCreationArrayList = new ArrayList<>();
+
+    protected Connection GetDbConnection() throws SQLException {
+        Connection connection = DriverManager.getConnection(DatabaseUtilsBase.connectionString);
+
+        if(!ExistAnyTables(connection))
+        {
+            CreateTables(connection);
+        }
+
+        return connection;
+    }
+
+    private void CreateTables(Connection connection) throws SQLException {
+        for (TableCreation tc : tableCreationArrayList) {
+            tc.CreateTable(connection);
+        }
+    }
+
+    private boolean ExistAnyTables(Connection connection) throws SQLException {
+        try (Statement stmt = connection.createStatement()) {
+            ResultSet rs = stmt.executeQuery("SELECT COUNT(*) FROM SYS.SYSTABLES WHERE TABLETYPE='T'");
+            if (rs.next()) {
+                return rs.getInt(1) > 0;
+            }
+        }
+        return false;
+    }
+
+
+}

src/main/java/at/ionas999/health/services/PatientService.java

@@ -0,0 +1,77 @@
+package at.ionas999.health.services;
+
+import at.ionas999.health.model.Patient;
+
+import java.sql.*;
+import java.util.ArrayList;
+
+public class PatientService extends DatabaseUtilsBase implements TableCreation {
+    public PatientService() {
+        this.tableCreationArrayList.add(this);
+    }
+
+
+    @Override
+    public void CreateTable(Connection connection) throws SQLException {
+        String createTableSmt = "CREATE TABLE Patient (\n" +
+                "    name VARCHAR(255) NOT NULL PRIMARY KEY,\n" +
+                "    appointment TIMESTAMP NOT NULL,\n" +
+                "    isEmergency BOOLEAN NOT NULL\n" +
+                ");";
+        connection.createStatement().executeQuery(createTableSmt);
+    }
+
+    public boolean AddPatient(Patient patient) {
+        try (Connection connection = this.GetDbConnection()) {
+            String insertStmt = "INSERT INTO Patient (name, appointment, isEmergency) VALUES (?, ?, ?);";
+
+            PreparedStatement prepStmt = connection.prepareStatement(insertStmt);
+
+            prepStmt.setString(1, patient.getName());
+            prepStmt.setTimestamp(2, Timestamp.valueOf(patient.getAppointment()));
+            prepStmt.setBoolean(3, patient.isEmergency());
+
+            int updates = prepStmt.executeUpdate();
+            prepStmt.close();
+            return updates == 1;
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public void DeletePatient(String name) {
+        try (Connection connection = this.GetDbConnection()) {
+            String stmt = "DELETE FROM Patient WHERE name = ?;";
+            PreparedStatement prepStmt = connection.prepareStatement(stmt);
+            prepStmt.setString(1, name);
+            int updates = prepStmt.executeUpdate();
+            prepStmt.close();
+            if (updates != 1) {
+                throw new RuntimeException("Failed to delete patient with name: " + name);
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public ArrayList<Patient> GetAllPatients() {
+        ArrayList<Patient> patients = new ArrayList<>();
+        try (Connection connection = this.GetDbConnection()) {
+            String stmt = "select name, appointment, isemergency from PATIENT;";
+            ResultSet rs = connection.createStatement().executeQuery(stmt);
+
+            while (rs.next()) {
+                Patient p = new Patient(rs.getString(1),
+                        rs.getTimestamp(2).toLocalDateTime(),
+                        rs.getBoolean(3));
+                patients.add(p);
+            }
+
+            rs.close();
+
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return patients;
+    }
+}

src/main/java/at/ionas999/health/services/TableCreation.java

@@ -0,0 +1,10 @@
+package at.ionas999.health.services;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+
+public interface TableCreation {
+    void CreateTable(Connection connection) throws SQLException;
+
+
+}

src/main/java/module-info.java

@@ -1,6 +1,7 @@
 module at.ionas999.solution {
     requires javafx.controls;
     requires javafx.fxml;
+    requires java.sql;
 
     opens at.ionas999.health.controller to javafx.fxml;
     exports at.ionas999.health;