Question

将详细信息插入子表时，我想从主表中减少该数量。例如，如果主表有10个项目，我通过表单减少6个项目，当我提交它时，主表应该有4个项目。我的主表是 mainstock ，子表是请求这是我的代码。

[![<form id="details" action="" method="POST">
        <label for="Item">Item</label>
        <select id="Item" name="Item">
            <option value="item one">One</option>
            <option value="item two">Two</option>
            <option value="item three">Three</option>
        </select>
        <label for="Quantity">Quantity</label>
        <input type="text" id="Quantity" name="Quantity" placeholder="Enter the Quantity">
        <label for="Location">Location</label>
        <select id="Location" name="Location">
            <option value="item one">One</option>
            <option value="item two">Two</option>
            <option value="item three">Three</option>
        </select>
        <label for="FromDate">From</label>
        <input <label type="text" id="FromDate" name="FromDate" placeholder="YYYY-MM-DD">
        <label for="ToDate">To</label>
        <input <label type="text" id="ToDate" name="ToDate" placeholder="YYYY-MM-DD">

        <center><button name="submit" type="submit" id="submit">Submit</button>
        <button onclick="win();" name="Back" type="back" id="details-back">Back</button></center>
    </form>

<!-- INSERT DATA INTO DATABASE -->
<?php

    if(isset($_POST\['submit'\])){


    $Item = $_POST\['Item'\];
    $Quantity = $_POST\['Quantity'\];
    $Location = $_POST\['Location'\];
    $FromDate = $_POST\['FromDate'\];
    $ToDate = $_POST\['ToDate'\];

    //Insert Query of SQL
    $query = mysql_query("INSERT INTO request(Item,Quantity,Location,FromDate,ToDate) VALUES ('$Item','$Quantity','$Location' ,'$FromDate', '$ToDate')",$connection);
    }

?>          
<!-- END INSERT DATA INTO DATABASE       -->]

Answer 1

您手头有数量，因此您可以更新主菜：

UPDATE `mainstock` SET `quantity`=`quantity` - '.$Quantity.' WHERE `item`="'.$Item.'"'

Answer 2

如果我理解正确，您希望在插入请求表后更新mainStock表中的数量。

为此你可以执行一个选择＆amp;更新主表上的查询。

例如=＆gt;

//选择查询

import base64
import zlib
data = 'H4sIAAAAAAAAAHWPwQqCQBCGX0Xm7EFtK+smZBEUgXoLCdMhFtKV3akI8d0bLYmibvPPN3wz00CJxmQnTO41whwWQRIctmEcB6sQbFC3CjW3XW8kxpOpP+OC22d1Wml1qZkQGtoMsScxaczKN3plG8zlaHIta5KqWsozoTYw3/djzwhpLwivWFGHGpAFe7DL68JlBUk+l7KSN7tCOEJ4M3/qOI49vMHj+zCKdlFqLaU2ZHV2a4Ct/an0/ivdX8oYc1UVX860fQDQiMdxRQEAAA=='

json_str = zlib.decompress(base64.b64decode(data), 16 + zlib.MAX_WBITS).decode('utf-8')

获得当前数量值后，您可以计算剩余数量。

$query = mysql_query("select Quantity from mainstock where Item = '$Item'"),$connection)

//使用更新查询更新主表

$remaining = $current - $Quantity;

希望这会有所帮助：）

减少主表的数量

2 个答案: