Question

我在Netbeans中做一个简单的java应用程序，包含一个包含2个字段，名称和年龄的注册表单。我想将文本字段信息提交到MySQL数据库。单击“提交”按钮时，我使用以下代码：

private void btnOKActionPerformed(java.awt.event.ActionEvent evt)
{                                      

    String name = txtName.getText();
    String age = txtAge.getText();

    String request = "INSERT INTO register VALUES ('"+name+"','"+age+"');";


    try{
    Class.forName("com.mysql.jdbc.Driver");
    Connection conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/registsDB","root","root");
    Statement st = conn.createStatement();
    st.executeQuery(request);
    }
    catch(Exception ex) {
        System.out.println("Whoops.");
    }

我认为连接是成功的，但是在执行查询时出现了某种错误。我已经看过几个例子，他们使用类似的代码，无法弄清楚是什么＆＃39错了。

相当新的java。如果有人可以帮助我，我会非常感激。提前致谢。

修改：

错误列表：

java.sql.SQLException: Can not issue data manipulation statements with executeQuery().
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1074)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:988)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:974)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:919)
at com.mysql.jdbc.StatementImpl.checkForDml(StatementImpl.java:504)
at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1523)
at jantarinho.Cadastro.btnOKActionPerformed(Register.java:113)
at registsDB.Register.access$000(Register.java:19)
at registDB.Register$1.actionPerformed(Register.java:52)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6505)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3320)
at java.awt.Component.processEvent(Component.java:6270)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:708)
at java.awt.EventQueue$4.run(EventQueue.java:706)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

Answer 1

您无法使用executeQuery（）方法操作表（插入，更新）。您需要运行stmt.executeUpdate（request）;.

https://docs.oracle.com/javase/7/docs/api/java/sql/Statement.html#executeUpdate%28java.lang.String%29

为什么我可以将java应用程序连接到MySQL DB但不能执行查询？

1 个答案: