Question

添加新库存时，我正在尝试更新库存数量。我使用数组是因为我想在页面中添加多个产品。但是数据不会插入数据库，也不会更新库存数量。我会在此代码上错过什么？

 <?php
include 'db_connection.php';

    if(isset($_POST["submit4"])){


        foreach($_POST['fk_product'] as $index => $searchid){

            $sql="INSERT INTO supplier (supplier_name, date_in, fk_product, quantity_in) VALUES ('".$_POST['supplier_name']."','".$_POST['date_in']."','".$_POST['fk_product'][$index]."', '".$_POST["quantity_in"][$index]."')"; 

            $quantity_bal=$_POST['quantity_bal'];

            if($quantity_bal==0){
            $sql="UPDATE product set quantity_bal= quantity_ori + '".$_POST["quantity_in"][$index]."' WHERE id_produk = '".$_GET['id']."'";
            }else if($quantity_bal!=0){
            $sql="UPDATE product set quantity_bal= quantity_bal + '".$_POST["quantity_in"][$index]."' WHERE id_produk = '".$_GET['id']."'";

            }

            $query = mysqli_multi_query($conn,$sql);
    if($query){
        header("location:product.php");
    }



    }      
        }
?>

Answer 1

您所缺少的是，您需要使用=赋值运算符来连接查询，您刚刚覆盖了前一个字符串，所以应该像这样

foreach($_POST['fk_product'] as $index => $searchid){

        $sql = "INSERT INTO supplier (supplier_name, date_in, fk_product, quantity_in) VALUES ('".$_POST['supplier_name']."','".$_POST['date_in']."','".$_POST['fk_product'][$index]."', '".$_POST["quantity_in"][$index]."')"; 

        $quantity_bal = $_POST['quantity_bal'];

        if($quantity_bal == 0){
            //I'm presuming that the quantity_ori is a variable here 'coz you're trying to sum up with the original to the latest one
            $sql .= "UPDATE product set quantity_bal= $quantity_ori + '".$_POST["quantity_in"][$index]."' WHERE id_produk = '".$_GET['id']."'";
        }else if($quantity_bal != 0){
            $sql .= "UPDATE product set quantity_bal= $quantity_bal + '".$_POST["quantity_in"][$index]."' WHERE id_produk = '".$_GET['id']."'";
        }

}

我们将更新查询中的=符号更改为.=，然后您先前的quantity_ori没有$符号，因为我们认为它是一个变量，请不要忘记$

如何插入库存数量并更新到另一个表中？

1 个答案: