Question

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // TODO add your handling code here:
    try
    {
        String sql="insert into invoice (bill_no,name,number,title1,title2,title3,title4) values(?,?,?,?,?,?,?)";
        pst=conn.prepareStatement(sql);

        pst.setString(1, jTextField1.getText());
        pst.setString(2, jTextField2.getText());
        pst.setString(3, jTextField3.getText());


        //this is my code to insert data from jTable1 into database
        //but no entry is made in my database for the following lines
        int last=jTable1.getRowCount();
        String column1= (String) jTable1.getValueAt(last-1,0);
        String column2= (String) jTable1.getValueAt(last-1,1);
        String column3= (String) jTable1.getValueAt(last-1,2);
        String column4= (String) jTable1.getValueAt(last-1,3);

        pst.execute();
        JOptionPane.showMessageDialog(null, "data saved");

    }
    catch(Exception e)
    {}
}

这是我将数据插入数据库的代码显示没有错误，但是当我检查我的数据库时，没有任何条目将JTable数据导入数据库，但成功插入了文本字段的数据请帮助我给我一个代码，将JTable中的数据插入数据库。我是初学者，不知道多少编码。

Answer 1

您没有错误，因为您没有在catch块中打印错误。

您必须将数据从jTable设置为pst。

try
{
    String sql="insert into invoice (bill_no,name,number,title1,title2,title3,title4) values(?,?,?,?,?,?,?)";
    pst=conn.prepareStatement(sql);

    pst.setString(1, jTextField1.getText());
    pst.setString(2, jTextField2.getText());
    pst.setString(3, jTextField3.getText());

    int last=jTable1.getRowCount();
    String column1= (String) jTable1.getValueAt(last-1,0);
    String column2= (String) jTable1.getValueAt(last-1,1);
    String column3= (String) jTable1.getValueAt(last-1,2);
    String column4= (String) jTable1.getValueAt(last-1,3);

    pst.setString(4,column1);
    pst.setString(5,column2);
    pst.setString(6,column3);
    pst.setString(7,column4);

    pst.execute();
    JOptionPane.showMessageDialog(null, "data saved");

}
catch(Exception e)
{e.printStackTrace();}

您可以将e.printStackTrace()放入catch block。

，以查看例外情况

Answer 2

这是一个不完整的代码.. 试试这个

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        try {
            String sql="insert into invoice (bill_no,name,number,title1,title2,title3,title4) values(?,?,?,?,?,?,?)";
            pst=conn.prepareStatement(sql);

            pst.setString(1, jTextField1.getText());
            pst.setString(2, jTextField2.getText());
            pst.setString(3, jTextField3.getText());

            int last=jTable1.getRowCount();
            String column1= (String) jTable1.getValueAt(last-1,0);
            String column2= (String) jTable1.getValueAt(last-1,1);
            String column3= (String) jTable1.getValueAt(last-1,2);
            String column4= (String) jTable1.getValueAt(last-1,3);

            pst.setString(4,column1);
            pst.setString(5,column2);
            pst.setString(6,column3);
            pst.setString(7,column4);

            pst.execute();
            JOptionPane.showMessageDialog(null, "data saved");

        }
        catch(Exception e) {
            e.printStackTrace();
        }
    }

在成功插入文本字段的数据时，无法将JTable数据插入数据库

2 个答案: