MySql查询抛出错误

Question

我只是想将它用作一个非常简单的注册系统，我想在我的表用户中存储用户和密码。如果实际执行查询，一切似乎都可以正常工作。我相信它在一个名为checkForDML的函数中失败（需要2个参数）。请帮忙谢谢。

//password is just censored    
String dbUrl = "jdbc:mysql://localhost:3306/gim?user=root&password=*********";
String dbClass = "com.mysql.jdbc.Driver";
String query = "Select * FROM users";

String user = txtUser.getText();
String password = txtPassword.getText();
txtUser.setText("");
txtPassword.setText("");
PreparedStatement ps;
query = "INSERT INTO gim.users(name, password) VALUES(?, ?)";
try
{
    Class.forName(dbClass).newInstance();
    Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/gim",   "root", "Pl4tf0rmD3v");
    ps = conn.prepareStatement(query);
    ps.setString(1, user);
    ps.setString(2, password);
    ps.executeQuery();
    conn.close();
}
catch(SQLException e) 
{
    e.printStackTrace();
}
catch(ClassNotFoundException e)
{
    e.printStackTrace();
}
catch(Exception e)
{
    e.printStackTrace();
}

堆栈跟踪是：

java.sql.SQLException: Can not issue data manipulation statements with executeQuery().
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:927)
at com.mysql.jdbc.StatementImpl.checkForDml(StatementImpl.java:490)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2194)
at com.soe.sony.im.gui.GUI$2.actionPerformed(GUI.java:181)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

Answer 1

对INSERT语句使用executeUpate（）方法而不是executeQuery（）方法：executeUpdate()

Answer 2

问题出在这里

ps.executeQuery();应为ps.executeUpdate();

ResultSet executeQuery（）

在此PreparedStatement对象中执行SQL查询 返回查询生成的ResultSet对象。

int executeUpdate（）

在此PreparedStatement中执行SQL语句 object，必须是SQL INSERT，UPDATE或DELETE 声明;或者返回任何内容的SQL语句，例如 作为DDL声明。

Also have a look at this link

祝你好运!!!