Question

我试图在我的swing应用程序中插入数据库中的数据，但它显示错误

java.sql.SQLException：无法检索过程的元数据。

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:910)
at com.mysql.jdbc.CallableStatement.extractProcedureName(CallableStatement.java:861)
at com.mysql.jdbc.CallableStatement.determineParameterTypes(CallableStatement.java:692)
at com.mysql.jdbc.CallableStatement.<init>(CallableStatement.java:513)
at com.mysql.jdbc.Connection.parseCallableStatement(Connection.java:4536)
at com.mysql.jdbc.Connection.prepareCall(Connection.java:4610)
at com.mysql.jdbc.Connection.prepareCall(Connection.java:4584)
at ttg.subject.saveActionPerformed(subject.java:110)
at ttg.subject.access$000(subject.java:15)
at ttg.subject$1.actionPerformed(subject.java:72)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
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:6535)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6300)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4891)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2750)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

我的代码在这里：

   /*
    * To change this license header, choose License Headers in Project           Properties.
   * To change this template file, choose Tools | Templates
    * and open the template in the editor.
  */
 package ttg;

import java.sql.ResultSet;
import javax.swing.JOptionPane;

/**
*
* @author Chirag Gojaria
*/

公共类主题扩展了javax.swing.JFrame {

database db = new database();

/**
 * Creates new form subject
 */
public subject() {
    initComponents();
}

/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    jPanel1 = new javax.swing.JPanel();
    jLabel1 = new javax.swing.JLabel();
    jLabel3 = new javax.swing.JLabel();
    jLabel4 = new javax.swing.JLabel();
    jLabel5 = new javax.swing.JLabel();
    nhr = new javax.swing.JTextField();
    name = new javax.swing.JTextField();
    cradit = new javax.swing.JTextField();
    save = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jPanel1.setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());

    jLabel1.setFont(new java.awt.Font("Times New Roman", 1, 18)); // NOI18N
    jLabel1.setText(":: Subject ::");
    jPanel1.add(jLabel1, new org.netbeans.lib.awtextra.AbsoluteConstraints(352, 46, 102, 29));

    jLabel3.setFont(new java.awt.Font("Times New Roman", 1, 14)); // NOI18N
    jLabel3.setText("Name                   :");
    jPanel1.add(jLabel3, new org.netbeans.lib.awtextra.AbsoluteConstraints(210, 90, 130, 30));

    jLabel4.setFont(new java.awt.Font("Times New Roman", 1, 14)); // NOI18N
    jLabel4.setText("Cradit                  :");
    jPanel1.add(jLabel4, new org.netbeans.lib.awtextra.AbsoluteConstraints(210, 130, 120, 30));

    jLabel5.setFont(new java.awt.Font("Times New Roman", 1, 14)); // NOI18N
    jLabel5.setText("No. of Hourse Req :");
    jPanel1.add(jLabel5, new org.netbeans.lib.awtextra.AbsoluteConstraints(210, 180, 130, 30));
    jPanel1.add(nhr, new org.netbeans.lib.awtextra.AbsoluteConstraints(350, 180, 240, 30));
    jPanel1.add(name, new org.netbeans.lib.awtextra.AbsoluteConstraints(350, 90, 240, 30));
    jPanel1.add(cradit, new org.netbeans.lib.awtextra.AbsoluteConstraints(350, 130, 240, 30));

    save.setFont(new java.awt.Font("Times New Roman", 1, 14)); // NOI18N
    save.setText("Save");
    save.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            saveActionPerformed(evt);
        }
    });
    jPanel1.add(save, new org.netbeans.lib.awtextra.AbsoluteConstraints(483, 233, 100, 30));

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, 785, Short.MAX_VALUE)
            .addGap(28, 28, 28))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, 313, Short.MAX_VALUE)
            .addGap(31, 31, 31))
    );

    pack();
}// </editor-fold>                        

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

    try {
        db.connection();
        if (name.getText().length() > 0) {

            ResultSet rs = db.getSpecificRecord("subject", "name", name.getText());

            if (rs.next()) {

                JOptionPane.showMessageDialog(this, "Alredy entered", "Error", JOptionPane.ERROR_MESSAGE);

            } else {
                java.sql.PreparedStatement psb = db.cn.prepareCall("insert into subject values(?,?,?)");
                psb.setString(1, name.getText());
                psb.setString(2, cradit.getText());
                psb.setString(3, nhr.getText());
                psb.execute();
                db.cn.close();
                JOptionPane.showMessageDialog(this, "New User create Successfully", "success", 1);

            }

        }

    } catch (Exception e) {

        e.printStackTrace();

    }
}                                    

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    /* Set the Nimbus look and feel */
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(subject.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(subject.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(subject.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(subject.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new subject().setVisible(true);
        }
    });
}

// Variables declaration - do not modify                     
private javax.swing.JTextField cradit;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JPanel jPanel1;
private javax.swing.JTextField name;
private javax.swing.JTextField nhr;
private javax.swing.JButton save;
// End of variables declaration

}

请提出一些建议

Answer 1

您正在尝试使用prepareCall()来执行常规SQL查询，prepareStatement()用于调用存储过程。请改用SELECT DISPLAY_ID, PICKER_NAME, CREDIT, HOURLY_RATE, DAILY_RATE, WEIGHT, CASE WHEN (DeviceGroups IS NOT NULL AND WorkerGroups IS NOT NULL) THEN CONCAT(DeviceGroups,',',WorkerGroups) WHEN (DeviceGroups IS NULL AND WorkerGroups IS NOT NULL) THEN WorkerGroups WHEN (DeviceGroups IS NOT NULL AND WorkerGroups IS NULL) THEN DeviceGroups WHEN (DeviceGroups IS NULL AND WorkerGroups IS NULL) THEN NULL END as GROUPS FROM....。

无法检索过程的元数据

1 个答案: