子句在PHP mysql中的WHERE

Question

我只想更新我最新插入的数据。但我确信我在WHERE (在$query1和$query2)上错了

<?php
include "koneksi.php";
$kdj=$_POST['kdj'];
$id=$_POST['id'];
$qty = $_POST['qty'];
$kodelagi = mysql_query("Select kd_jual from nota ORDER BY id_nota DESC LIMIT 1");
$row = mysql_fetch_array($kodelagi);
$kodelagi1 = $row['kd_jual'];
if((!empty($id)) && (!empty($kdj)) && (!empty($qty)))
{
    $query = mysql_query("INSERT INTO nota (id_item,qty,kd_jual) values ('$id','$qty','$kdj');");
    $query1 = mysql_query("UPDATE nota,item SET nota.harga_item = item.harga_item WHERE nota.kd_jual = '$kodelagi1'");
    $query2 = mysql_query("UPDATE nota SET subtotal = harga_item * qty WHERE nota.kd_jual = '$kodelagi1'");
    ?><script language="Javascript">;
    document.location = 'transaksi2.php' </script><?php
}else 
{
    print "<script>alert('Maaf, tidak boleh ada field yang kosong !');
    javascript:history.go(-1);</script>";
}?> 

因为当我运行这个的时候，我在我的数据库里得到了这个

| id_nota | id_item | harga_item | qty | subtotal | Kd_jual
|  57     |   11    |  0         | 23  |  0       |13-10-201323:32:20

Answer 1

您正在尝试在插入之前获取最新的插入记录。插入记录后执行选择查询。还有一点，您将为最后插入的记录获取"kd_jual“值。它是datetime列。可以有多条记录具有相同的日期时间。因此，在某些用例中，这将失败&依次更新多个记录(不仅仅是最近插入的记录)。最好使用ID列(Id_nota)

我尝试修改你的代码，如下所示。我没有测试过它。如果需要，请进行更正。

<?php
include "koneksi.php";
$kdj=$_POST['kdj'];
$id=$_POST['id'];
$qty = $_POST['qty'];

if((!empty($id)) && (!empty($kdj)) && (!empty($qty)))
{
$query = mysql_query("INSERT INTO nota (id_item,qty,kd_jual) values ('$id','$qty','$kdj');");

$kodelagi = mysql_query("Select id_nota from nota ORDER BY id_nota DESC LIMIT 1");
$row = mysql_fetch_array($kodelagi);
$max_id_nota= $row['id_nota'];

$query1 = mysql_query("UPDATE nota,item SET nota.harga_item = item.harga_item WHERE nota.id_nota = '$max_id_nota'");

$query2 = mysql_query("UPDATE nota SET subtotal = harga_item * qty WHERE nota.id_nota = '$max_id_nota'");

?><script language="Javascript">;
document.location = 'transaksi2.php' </script><?php
}else 
{
print "<script>alert('Maaf, tidak boleh ada field yang kosong !');
javascript:history.go(-1);</script>";
}?>