Added "Save Schedule" button to Calendar View

Saved to database with timestamp
Added "Load Schedule" dropdown to select previous schedules
Implemented "Delete Schedule" functionality

src/main/java/org/example/se302/ExamSchedulerApp.java

@@ -4,8 +4,10 @@ import javafx.application.Application;
 import javafx.fxml.FXMLLoader;
 import javafx.scene.Scene;
 import javafx.stage.Stage;
+import org.example.se302.data.DatabaseManager;
 
 import java.io.IOException;
+import java.sql.SQLException;
 
 /**
  * Main JavaFX Application for Exam Scheduling System.
@@ -23,6 +25,16 @@ public class ExamSchedulerApp extends Application {
         String css = ExamSchedulerApp.class.getResource("css/application.css").toExternalForm();
         scene.getStylesheets().add(css);
 
+        //create tables in database if does not exists
+        try{
+
+            DatabaseManager.CreateTable();
+        }
+        catch (SQLException e)
+        {
+
+        }
+
         stage.setTitle("Exam Scheduling System v1.0");
         stage.setMinWidth(900);
         stage.setMinHeight(600);

src/main/java/org/example/se302/data/DatabaseManager.java

@@ -1,19 +1,21 @@
 package org.example.se302.data;
 
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.SQLException;
-import java.sql.Statement;
+import org.example.se302.model.ExamSchedule;
+
+import java.sql.*;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
 
 public class DatabaseManager {
 
+    private static final DateTimeFormatter FORMATTER = DateTimeFormatter.ISO_LOCAL_DATE_TIME;
+
     private static final String JDBC_URL = "jdbc:sqlite:src/main/resources/db/exam_scheduler.db";
 
     private static final String CREATE_SCHEDULES_TABLE =
             "CREATE TABLE IF NOT EXISTS schedules (" +
                     "    schedule_id INTEGER PRIMARY KEY AUTOINCREMENT," +
                     "    name TEXT NOT NULL," +
-                    "    description TEXT," +
                     "    created_at DATETIME NOT NULL," +
                     "    last_modified DATETIME NOT NULL," +
                     "    is_finalized BOOLEAN NOT NULL DEFAULT 0," +
@@ -61,7 +63,4 @@ public class DatabaseManager {
     }
 
 
-
-
-
 }

src/main/java/org/example/se302/data/ScheduleDAO.java

@@ -1,18 +1,226 @@
 package org.example.se302.data;
 
+import org.example.se302.model.ExamAssignment;
 import org.example.se302.model.ExamSchedule;
+import org.example.se302.model.ScheduleConfiguration;
+
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.sql.*;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
 
 public class ScheduleDAO {
 
+    private static final DateTimeFormatter FORMATTER = DateTimeFormatter.ISO_LOCAL_DATE_TIME;
 
-    public static void SaveSchedule(ExamSchedule examSchedule)
+    public static void InsertSchedule(ExamSchedule examSchedule) throws SQLException
     {
+        long scheduleId = 0;
 
+        try (Connection conn = DatabaseManager.getConnection()) {
+        conn.setAutoCommit(false);
+
+        String sqlSchedule = "INSERT INTO schedules (name, created_at, last_modified, is_finalized, " +
+                "config_num_days, config_slots_per_day, config_start_date) " +
+                "VALUES (?, ?, ?, ?, ?, ?, ?)";
+
+        try (PreparedStatement stmt = conn.prepareStatement(sqlSchedule, Statement.RETURN_GENERATED_KEYS)) {
+
+            String createdAtStr = FORMATTER.format(examSchedule.getCreatedAt());
+            String modifiedAtStr = FORMATTER.format(examSchedule.getLastModified());
+
+            stmt.setString(1, examSchedule.getScheduleName());
+            stmt.setString(2, createdAtStr);
+            stmt.setString(3, modifiedAtStr);
+            stmt.setBoolean(4, examSchedule.isFinalized());
+
+            stmt.setInt(5, examSchedule.getConfiguration().getNumDays());
+            stmt.setInt(6, examSchedule.getConfiguration().getSlotsPerDay());
+            stmt.setString(7, examSchedule.getConfiguration().getStartDate().toString());
+
+            stmt.executeUpdate();
+
+            try (ResultSet rs = stmt.getGeneratedKeys()) {
+                if (rs.next()) {
+                    scheduleId = rs.getLong(1);
+                } else {
+                    throw new SQLException("Program ID'si eklenemedi, veritabanı hatası.");
+                }
+            }
         }
 
-    public static void DeleteSchedule(ExamSchedule examSchedule)
+        if (scheduleId > 0) {
+            InsertAssignments(conn, scheduleId, examSchedule.getAllAssignments());
+        }
+
+        conn.commit();
+
+        } catch (SQLException e) {
+            System.err.println("Yeni program kaydedilirken bir veritabanı hatası oluştu: " + e.getMessage());
+            throw e;
+        }
+    }
+
+    private static void InsertAssignments(Connection conn, long scheduleId, Collection<ExamAssignment> assignments) throws SQLException {
+        String sql = "INSERT INTO exam_assignments (schedule_id, course_code, student_count, is_locked, day_index, timeslot_index, classroom_id) " +
+                "VALUES (?, ?, ?, ?, ?, ?, ?)";
+
+        try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+            for (ExamAssignment assignment : assignments) {
+
+                stmt.setLong(1, scheduleId);
+                stmt.setString(2, assignment.getCourseCode());
+                stmt.setInt(3, assignment.getStudentCount());
+                stmt.setBoolean(4, assignment.isLocked());
+
+                stmt.setInt(5, assignment.getDay());
+                stmt.setInt(6, assignment.getTimeSlotIndex());
+
+                if (assignment.getClassroomId() != null) {
+                    stmt.setString(7, assignment.getClassroomId());
+                } else {
+                    stmt.setNull(7, Types.VARCHAR);
+                }
+
+                stmt.addBatch();
+            }
+            stmt.executeBatch();
+        }
+    }
+
+    public static boolean DeleteSchedule(long scheduleId) throws SQLException
     {
+        String sql = "DELETE FROM schedules WHERE schedule_id = ?";
 
+        try (Connection conn = DatabaseManager.getConnection();
+             PreparedStatement stmt = conn.prepareStatement(sql)) {
+
+            stmt.setLong(1, scheduleId);
+
+            int rowsAffected = stmt.executeUpdate();
+
+            if (rowsAffected > 0) {
+                System.out.printf("Schedule ID %d başarıyla silindi.\n", scheduleId);
+                return true;
+            } else {
+                System.out.printf("Hata: Schedule ID %d bulunamadı veya silinemedi.\n", scheduleId);
+                return false;
+            }
+
+        } catch (SQLException e) {
+            System.err.printf("Program ID %d silinirken veritabanı hatası oluştu: %s\n", scheduleId, e.getMessage());
+            throw e;
+        }
+    }
+    public ExamSchedule loadSchedule(long scheduleId) throws SQLException {
+        ScheduleConfiguration config = null;
+        ExamSchedule schedule = null;
+
+        try (Connection conn = DatabaseManager.getConnection()) {
+
+            // 1. Program Meta Verisini ve Konfigürasyonu Yükle
+            config = loadConfiguration(conn, scheduleId);
+
+            if (config == null) {
+                return null; // Belirtilen ID'ye sahip program bulunamadı.
+            }
+
+            // 2. Temel Schedule Nesnesini Oluştur
+            schedule = loadScheduleMetadata(conn, scheduleId, config);
+
+            if (schedule != null) {
+                // 3. Atamaları Yükle ve Programa Ekle
+                List<ExamAssignment> assignments = loadAssignments(conn, scheduleId);
+
+                for (ExamAssignment assignment : assignments) {
+                    // ExamSchedule'ın assignments Map'ine bu atamaları ekle
+                    schedule.addAssignment(assignment);
+                }
+            }
+
+            return schedule;
+
+        } catch (SQLException e) {
+            System.err.printf("Program ID %d yüklenirken veritabanı hatası oluştu: %s\n", scheduleId, e.getMessage());
+            throw e;
+        }
+    }
+
+    private ScheduleConfiguration loadConfiguration(Connection conn, long scheduleId) throws SQLException {
+        String sql = "SELECT config_num_days, config_slots_per_day, config_start_date FROM schedules WHERE schedule_id = ?";
+        try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+            stmt.setLong(1, scheduleId);
+            try (ResultSet rs = stmt.executeQuery()) {
+                if (rs.next()) {
+                    int numDays = rs.getInt("config_num_days");
+                    int slotsPerDay = rs.getInt("config_slots_per_day");
+                    String startDateStr = rs.getString("config_start_date");
+
+                    // Not: ScheduleConfiguration constructor'ınızın bu alanları almasını varsayıyorum.
+                    return new ScheduleConfiguration(numDays, slotsPerDay);
+                }
+            }
+        }
+        return null;
+    }
+
+
+    private ExamSchedule loadScheduleMetadata(Connection conn, long scheduleId, ScheduleConfiguration config) throws SQLException {
+        String sql = "SELECT name, created_at, last_modified, is_finalized FROM schedules WHERE schedule_id = ?";
+        try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+            stmt.setLong(1, scheduleId);
+            try (ResultSet rs = stmt.executeQuery()) {
+                if (rs.next()) {
+                    String name = rs.getString("name");
+                    LocalDateTime createdAt = LocalDateTime.parse(rs.getString("created_at"), FORMATTER);
+                    LocalDateTime lastModified = LocalDateTime.parse(rs.getString("last_modified"), FORMATTER);
+                    boolean isFinalized = rs.getBoolean("is_finalized");
+
+                    // ExamSchedule'ı konfigürasyon ile başlat
+                    ExamSchedule schedule = new ExamSchedule(config);
+
+                    schedule.setScheduleName(name);
+                    schedule.setFinalized(isFinalized);
+
+                    return schedule;
+                }
+            }
+        }
+        return null;
+    }
+
+    private List<ExamAssignment> loadAssignments(Connection conn, long scheduleId) throws SQLException {
+        List<ExamAssignment> assignments = new ArrayList<>();
+        String sql = "SELECT course_code, student_count, is_locked, day_index, timeslot_index, classroom_id " +
+                "FROM exam_assignments WHERE schedule_id = ?";
+
+        try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+            stmt.setLong(1, scheduleId);
+            try (ResultSet rs = stmt.executeQuery()) {
+                while (rs.next()) {
+                    String courseCode = rs.getString("course_code");
+                    int studentCount = rs.getInt("student_count");
+                    boolean isLocked = rs.getBoolean("is_locked");
+                    int dayIndex = rs.getInt("day_index");
+                    int timeSlotIndex = rs.getInt("timeslot_index");
+                    String classroomId = rs.getString("classroom_id");
+
+                    ExamAssignment assignment = new ExamAssignment(courseCode);
+                    assignment.setStudentCount(studentCount);
+                    assignment.setLocked(isLocked);
+
+                    assignment.setDay(dayIndex);
+                    assignment.setTimeSlotIndex(timeSlotIndex);
+                    assignment.setClassroomId(classroomId);
+
+                    assignments.add(assignment);
+                }
+            }
+        }
+        return assignments;
     }