Java Mysql 准备好的语句更新错误

Question

我正在处理一个 java 项目，我需要更新 mysql 数据库中的一行。我正在使用 preparedStatement 并且确实收到错误。我尝试只使用语句并且它有效。但是我需要在我的 sql statemnet 中设置一些数据。所以我必须使用preparedStatement。怎么了？

所以我有一个包含 4 列的数据库：Integer id (AI)、Boolean monf2d、Varchar monf2p 和 Varchar monf2a。数据库有 2 行，我想更新第一行，id 1。

带有 PreparedStatement 的第一个版本：

private Connection connection;
public void test() {
        PreparedStatement pr;
        String sql = "UPDATE routes SET monf2d = true, monf2p = 'Data1', monf2a = 'Data2'  WHERE id = ?";
        try {
            this.connection = ServerConnection.getConnection();
            pr = this.connection.prepareStatement(sql);
            pr.setInt(1,1);
            pr.executeQuery();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

带有 PreparedStatement 的第二个版本：

private Connection connection;
public void test() {
        Statement st;
        String sql = "UPDATE routes SET monf2d = true, monf2p = 'Data1', monf2a = 'Data2'  WHERE id = 1";
        try {
            this.connection = ServerConnection.getConnection();
            st = this.connection.createStatement();
            st.execute(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

当我使用带有 preparedStatement 的版本时，出现此错误。

java.sql.SQLException: Can not issue data manipulation statements with executeQuery().
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:898)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:887)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:861)
    at com.mysql.jdbc.StatementImpl.checkForDml(StatementImpl.java:469)
    at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1968)
    at dbUtil.ServerSync.test(ServerSync.java:224)
    at adminapp.AdminController.initialize(AdminController.java:55)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2425)
    at loginapp.LoginController.adminLogin(LoginController.java:107)
    at loginapp.LoginController.login(LoginController.java:89)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
    at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
    at javafx.event.Event.fireEvent(Event.java:198)
    at javafx.scene.Node.fireEvent(Node.java:8411)
    at javafx.scene.control.Button.fire(Button.java:185)
    at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase.handle(BehaviorSkinBase.java:96)
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase.handle(BehaviorSkinBase.java:89)
    at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
    at javafx.event.Event.fireEvent(Event.java:198)
    at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
    at javafx.scene.Scene$MouseHandler.access00(Scene.java:3485)
    at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
    at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:394)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent8(GlassViewEventHandler.java:432)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:410)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:431)
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
    at com.sun.glass.ui.View.notifyMouse(View.java:937)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null2(WinApplication.java:177)
    at java.lang.Thread.run(Thread.java:748)

Answer 1

要在语句的情况下更新 table，您必须使用 executeUpdate() 方法。

而不是使用

st.execute(sql);

在下面使用。

st.executeUpdate(sql);

如果是 PreparedStatement，则必须使用 executeUpdate() 方法。

要了解有关 Statement 和 PreparedStatment 中方法的更多详细信息，请查看下面的链接。 https://docs.oracle.com/javase/8/docs/api/java/sql/Statement.html

https://docs.oracle.com/javase/8/docs/api/java/sql/PreparedStatement.html#executeUpdate--

Answer 2

不使用 pr.executeQuery()，而是使用 pr.executeUpdate(sql)。它应该像一个魅力。

我们将 executeQuery() 用于 "select" 类型的查询，但为了执行对 table 进行修改的查询，请使用 "executeUpdate" 或 "executeLargeUpdate"（在如果要修改大量行）方法

Java Mysql 准备好的语句更新错误

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