import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.swing.JOptionPane;
import javax.swing.table.DefaultTableModel;
import javax.sql.*;

public class Student extends javax.swing.JFrame {
    ResultSet rs;
    PreparedStatement pst = null;
    JDBCconnection conn;

    public Student() {
        initComponents();
        conn = new JDBCconnection();
    }
}

//               JDBCconnection con = new JDBCconnection();
private void btnaddStudentactionPerformed(java.awt.event.actionEvent evt) {                                              
    conn.Connection();
    String studentid = txtStudent_Id.getText();
    String studentname = txtStudentName.getText();
    String studentfathername = txtFatherName.getText();
    String rollno = txtRollNo.getText();
    String  studentclass = txtClass.getText();
    DefaultTableModel model =  (DefaultTableModel) 

tableStudent.getModel（）;         model.addRow（new Object [] {             学生编号，学生姓名，学生父亲姓名，学生班级，罗尔诺         }）;         尝试{             字符串查询；             查询=“插入student（Student_Id，Student_Name，     Father_Name，Roll_No，Class）VALUES（？，？，？，？，？）？“;             JOptionPane.showmessagedialog（null，“已插入数据         成功..“）;             pst = conn.prepareStatement（query）; // ****错误          prepareStatement ****             pst.setString（1，txtStudent_Id.getText（））;             pst.execute（）;         } catch（Exception e）{         }     }