Question

我试图将数据从jtable插入数据库!!从jtexfield插入前三列（stafftimetableid，staffname，staffid）（未发现错误，成功添加）但是当我试图从jtable插入时，它会提示java.null pointerExcetion错误!!

我在数据库连接中没有错误!!

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        if (jComboBox1.getSelectedItem().equals("Staff Time Table"))
        {
            try 
            {
                PreparedStatement pst =null;
                Connection con = clerkpanell.DBConnection.connectDB();
                String data=jTable2.getValueAt(0,1).toString();

                String sql = "insert into stafftimetable      (StaffTimeTableID,StaffName,StaffID,7.50-8.30) values ('"+ttid.getText()+"','"+staffname.getText()+"','"+staffid.getText()+"','"+data+"');";


                 pst=con.prepareStatement(sql);
                 pst.executeUpdate();
             //    JOptionPane.showMessageDialog(null,"Added");
            }
            catch (Exception e)

            {
                JOptionPane.showMessageDialog(null,e);

            }    
        }

Answer 1

在此声明中String sql = "insert into stafftimetable (StaffTimeTableID,StaffName,StaffID,7.50-8.30) values ('"+ttid.getText()+"','"+staffname.getText()+"','"+staffid.getText()+"','"+data+"');";

请将ttid.getText()，staffname.getText()，staffid.getText()存储到单独的变量中。像这样的东西，

String ttid=ttid.getText();
String staffname = staffname.getText();
String staffid = staffid.getText();

然后插入语句应该是这样的

String sql = "insert into stafftimetable      (StaffTimeTableID,StaffName,StaffID,7.50-8.30) values ('"+ttid.+"','"+staffname+"','"+staffid+"','"+data+"');";

如何将值从jtable插入到mysql？

1 个答案: