如何调用自动递增的MySQL的主键Java变量

-1

| Pid  | int(6) unsigned zerofill | NO | PRI | NULL | auto_increment | 

| Ino  | varchar(20)    | NO | PRI |   |    | 

| pno  | int(11)     | NO | PRI | 0  |    | 

| cno  | int(11)     | NO | PRI | 0  |    | 

| Pamount | double     | NO |  |   |    | 

| Pdate | date      | NO |  |   |    | 

| Ptype | varchar(15)    | NO |  |   |    |

插入值

String ch_sql = 
    "INSERT INTO Payment(Ino , pno , cno, Pamount, Pdate, Ptype) VALUES('" + 
    (paymentIno) + "','" + 
    (cashPno) + "','" + 
    (cashCno) + "','" + 
    (cashAmount) + "','" + 
    (cashDate) + "','" + 
    (cashType) + "')"; 
ch.executeUpdate(ch_sql);

现在我已经得到了自动将MySQL值递增为一个Java变量，以便我可以将该pid插入到下表中。

另一张表，我应该插入pid：

pid | int（11）| NO | PRI | 0

所有事情都发生在一次点击事件中。

private void jButton25ActionPerformed(java.awt.event.ActionEvent evt) { 

    try { 
     Connection_db cd = new Connection_db(); 
     Connection con = cd.createconnection(); 
     Statement ch = con.createStatement(); 
     Statement cq = con.createStatement(); 
     Statement dd = con.createStatement(); 

     String paymentIno = Payment_Invoice_No.getText(); 
     String depositDate = DD_date.getText(); 
     String depositBrand = DD_brand.getText(); 
     String sql_get = "SELECT Pno, Cno FROM invoice WHERE Ino = '" + (paymentIno) + "'"; 
     ResultSet sql_get_rs = ch.executeQuery(sql_get); 
     String cashPno = ""; 
     String cashCno = ""; 

     while (sql_get_rs.next()) { 
      cashPno = sql_get_rs.getString("Pno"); 
      cashCno = sql_get_rs.getString("Cno"); 
     } 

     int cashAmount = Integer.parseInt(Cash_Amount.getText()); 
     String cashDate = Cash_Date.getText(); 
     String cashType = ""; 

     if (rb_cash.isSelected()) { 
      cashType = "Cash"; 
     } else if (rb_cheque.isSelected()) { 
      cashType = "Cheque"; 
     } else if (rb_dd.isSelected()) { 
      cashType = "Direct Deposit"; 
     } 

     String ch_sql = 
      "INSERT INTO Payment(Ino , pno , cno, Pamount, Pdate, Ptype) VALUES('" + 
      (paymentIno) + "','" + 
      (cashPno) + "','" + 
      (cashCno) + "','" + 
      (cashAmount) + "','" + 
      (cashDate) + "','" + 
      (cashType) + "')"; 
     ch.executeUpdate(ch_sql); 
     JOptionPane.showMessageDialog(null, "Sucessfully paid"); 

     int paymentBalance = Integer.parseInt(Payment_Invoice_Balance.getText()); 
     paymentBalance = paymentBalance - cashAmount; 
     String sql_balance = 
      "UPDATE invoice set Ibalance = '" + (paymentBalance) + 
      "' WHERE ino = '" + (paymentIno) + "'"; 
     ch.executeUpdate(sql_balance); 
     Payment_Invoice_Balance.setText(String.valueOf(paymentBalance)); 

     if (rb_cheque.isSelected()) { 
      // 
     } else if (rb_dd.isSelected()) { 
      // ???? String sql_pid = "SELECT pid FROM Payment WHERE pid" 

      String sql_directD = 
       "INSERT INTO Payment VALUES('" + 
       (paymentIno) + "','" + 
       (cashPno) + "','" + 
       (cashCno) + "','" + 
       (cashAmount) + "','" + 
       (cashDate) + "','" + 
       (cashType) + "')"; 
     } 
    } 
    catch (Exception e) { 
     JOptionPane.showMessageDialog(this, e.getMessage()); 
    } 
}

来源

2017-04-16 Stefan Shiloh

我们应该理解的是什么？ –

你想获得最后生成的密钥吗？ –

不清楚你在这里问什么，因为你的问题的格式化使得它不可读，并且因为你似乎没有提出问题。请通读[我如何问一个好问题？]（http://stackoverflow.com/help/how-to-ask），然后回来并相应地编辑您的问题。 – DaveyDaveDave

try (ResultSet generatedKeys = ch.getGeneratedKeys()) { 
     if (generatedKeys.next()) { 
      return generatedKeys.getLong(1); 
     } 
     else { 
      throw new SQLException("Creating user failed, no ID obtained."); 
     } 
    }

来源

2017-04-16 07:10:27

我是新来的，所以我不太明白你在这里做了什么。 –

你能告诉我们整个方法，以便我们可以帮助你更多！ –

我编辑了整个方法的帖子 –

如何调用自动递增的MySQL的主键Java变量

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