**DELETE.PHP**
<?PHP
include("db.PHP");
$id = $_GET['id'];
$check=MysqLi_query($conn,"SELECT * FROM details WHERE id='$id'");
while($row = MysqLi_fetch_array($check))
{
$sub=$row['sub'];
$quan=$row['quan'];
}
$check1=MysqLi_query($conn,"SELECT * FROM instock WHERE s_brand=$sub");
while($row1 = MysqLi_fetch_array($check1))
{
$qty1=$row1['qty'];
}
$check2=MysqLi_query($conn,"SELECT * FROM outstock WHERE s_brand=$sub");
while($row2 = MysqLi_fetch_array($check2))
{
$qty2=$row2['qty'];
}
$test2=MysqLi_query($conn,"UPDATE instock SET qty =$qty1+$quan WHERE
s_brand='$sub'");
$test3=MysqLi_query($conn,"UPDATE outstock SET qty =$quan-$qty2 WHERE
s_brand='$sub'");
$result = MysqLi_query($conn, "DELETE FROM details WHERE id=$id");
header("Location:add_sale.PHP");
?>
这是我的delete.PHP文件
删除查询工作正常.但是两个更新查询工作错误.它只是从$quan设置了数量.
我需要马上
提前致谢.
解决方法:
在你的第二个和第三个SELECT语句中,我认为你可能需要在$sub周围添加单引号,所以它们将是:
$check1=MysqLi_query($conn,"SELECT * FROM instock WHERE s_brand='$sub'");
和
$check2=MysqLi_query($conn,"SELECT * FROM outstock WHERE s_brand='$sub'");