Java 如何将父表中的行删除到子表中的引用列？

我在javaFx项目和SQlite数据库中使用JDBC。我有两个表

“PROJECT”

和

“SMAllPROJECT”

，例如PROJECT具有此结构

PROJECT（名称、日期、状态）

和

SMAllPROJECT

具有此结构

SMAllPROJECT（名称、日期、状态、*项目名称*）

<代码>项目名称引用自

项目表

的

名称

列

我正在尝试从

PROJECT

中删除行，应该删除

SMAllPoject

中引用的行。在sqlitestudio中，当我从父表中应用delete行时，我配置了

onCascade

方法，当我在sqlitestudio中测试它时，一切都很好，但在我的代码中，它只是从父表中删除了行

这是我的代码：

控制器方法

public void ExecuteDeleteProject() {

        if (!SearchIdProjectSupp.getText().isEmpty()) {

            Project project = new ProjectDao().FindString(SearchIdProjectSupp.getText());
            new ProjectDao().Delete(project);
            String title = "Suppression";
            String message = "Vous avez supprimé le projet " + SearchIdProjectSupp.getText() + ".";
            NotificationType notification = NotificationType.SUCCESS;
            TrayNotification tray = new TrayNotification();
            tray.setTitle(title);
            tray.setMessage(message);
            tray.setNotificationType(notification);
            tray.setAnimationType(AnimationType.SLIDE);
            tray.setImage(new Image("Images/check.png"));
            tray.setRectangleFill(Paint.valueOf("#a8a9fe"));
            tray.showAndDismiss(Duration.seconds(4));
            SearchIdProjectSupp.setText("");
            SuppPaneProject.setVisible(false);
            DeleteProjetButton.setDisable(true);
            CountP.setVisible(true);
            CountP();
            CountR();
            CountPP();

        }

    }

public boolean Delete(Project Object) {

        try {

            String queryDeletePerson = "DElETE FROM PROJECT WHERE name=" + "'" + Object.getName() + "'";//Query Insertion in Person_Table

            PreparedStatement preparedStatementPerson = Dbaconnection.getConnection().prepareStatement(queryDeletePerson);//Prepared statement i use this for high performance 

            preparedStatementPerson.execute();

        } catch (SQLException ex) {

            Logger.getLogger(EMPDao.class.getName()).log(Level.SEVERE, null, ex);
        }

        return true;
    }

DAO模式方法

public void ExecuteDeleteProject() {

        if (!SearchIdProjectSupp.getText().isEmpty()) {

            Project project = new ProjectDao().FindString(SearchIdProjectSupp.getText());
            new ProjectDao().Delete(project);
            String title = "Suppression";
            String message = "Vous avez supprimé le projet " + SearchIdProjectSupp.getText() + ".";
            NotificationType notification = NotificationType.SUCCESS;
            TrayNotification tray = new TrayNotification();
            tray.setTitle(title);
            tray.setMessage(message);
            tray.setNotificationType(notification);
            tray.setAnimationType(AnimationType.SLIDE);
            tray.setImage(new Image("Images/check.png"));
            tray.setRectangleFill(Paint.valueOf("#a8a9fe"));
            tray.showAndDismiss(Duration.seconds(4));
            SearchIdProjectSupp.setText("");
            SuppPaneProject.setVisible(false);
            DeleteProjetButton.setDisable(true);
            CountP.setVisible(true);
            CountP();
            CountR();
            CountPP();

        }

    }

public boolean Delete(Project Object) {

        try {

            String queryDeletePerson = "DElETE FROM PROJECT WHERE name=" + "'" + Object.getName() + "'";//Query Insertion in Person_Table

            PreparedStatement preparedStatementPerson = Dbaconnection.getConnection().prepareStatement(queryDeletePerson);//Prepared statement i use this for high performance 

            preparedStatementPerson.execute();

        } catch (SQLException ex) {

            Logger.getLogger(EMPDao.class.getName()).log(Level.SEVERE, null, ex);
        }

        return true;
    }

这是我的DDL

CREATE TABLE PROJECT (
    NAME VARCHAR2 (100) PRIMARY KEY,
    STATE  VARCHAR2 (100),
    DATEDBT DATE,
 );

CREATE TABLE SMALLPROJECT (
    NAMEPROJECT       VARCHAR2 (100) REFERENCES PROJECT (NAME) ON DELETE CASCADE
                                                          ON UPDATE CASCADE,
    NAME VARCHAR2 (20)  PRIMARY KEY,
    DATEDBT     DATE,
    STATE VARCHAR2 (20)  PRIMARY KEY

    );

根据和的答案 ，它应该在执行任何查询之前配置数据库连接。我有这个问题，因为我没有强制外键约束

public static final String DB_URL = "jdbc:sqlite:database.db";  
public static final String DRIVER = "org.sqlite.JDBC";  

public static Connection getConnection() throws ClassNotFoundException {  
    Class.forName(DRIVER);  
    Connection connection = null;  
    try {  
        SQLiteConfig config = new SQLiteConfig(); //I add this configuration 
        config.enforceForeignKeys(true);  
        connection = DriverManager.getConnection(DB_URL,config.toProperties());  
    } catch (SQLException ex) {}  
    return connection;  
}

---

您能否共享表的定义（不仅仅是列列表，还有用于创建它们的实际DDL）？@Mureinik，我共享了用于创建它们的实际DDL。当您建立与SQLite数据库的JDBC连接时，是否显式启用外键，通过执行

PRAGMA foreign_keys=ON

或使用

SQLiteConfig

object？@MenaiAlaEddine，这些DDL会产生多个错误。你确定这些是你的DDL吗？@GordThompson我使用了SQLiteConfig对象，它工作得很好，谢谢。