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我想插頁我的Swing應用程序數據庫中的數據，但它顯示錯誤無法檢索元數據過程
值java.sql.SQLException：無法檢索元數據的過程。
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)
我的代碼是在這裏：
/*
* 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
*/
公共類主題擴展javax.swing.JFrame中{
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
}
請給一些建議
thanx bro ..它的工作 –