Question

我想将表单中的数据插入两个表（购买和库存），如果有相同的项目，我希望它插入购买表（记录购买）并更新到库存表（而不是购买表，所以它凸轮添加购买的项目的数量，并在库存表上没有重复的项目）。问题是我不明白这种行为的代码逻辑。

表单页面代码段：

<form name="purchaseform" method="post" onsubmit="return validateForm()" action="submitpurchaseadmin.php">
<table>
<tr>
        <td>Type</td>
        <td>
        <select name="type">
        <option value="opt1">Option1</option>
        <option value="opt2">Option2</option>
        </select>
        </td>
</tr>
    <tr>
        <td>Quantity</td>
        <td><input type="text" name="qty"></td>
    </tr>
    <tr>
        <td>Date</td>
        <td><input type="text" name="date" value="<?php echo date("d-m-Y"); ?>"></td>
    </tr>
    <tr>
        <td colspan="2" align="center"><input type="submit" name="submit" value="Save"></td>
    </tr>
</table>
</form>

当前提交代码段：

<?php
include("connect.php");

$host="localhost";
$user="root";
$pass="";
$db_name="proyek";
$tbl_name="purchase";

mysql_connect("$host", "$user", "$pass")or die("Cannot connect to SQL."); 
mysql_select_db('$db_name');

$type=$_POST['type'];
$qty=$_POST['qty'];
$date=$_POST['date'];

$query=("SELECT * FROM stock");
$result=mysql_query($query);
$row=mysql_num_rows($result);
if ($row==0)
{
    mysql_query("INSERT into stock (item, qty) VALUES ('$type', '$qty')");
    mysql_query("INSERT into purchase (type, qty, date) VALUES ('$type', '$qty', '$date')");
}
else
{
    mysql_query("INSERT into purchase (type, qty, date) VALUES ('$type', '$qty', '$date')");
    mysql_query("UPDATE stock SET qty=qty+'$qty' WHERE item='$type'");
}
header("location:purchasehistory.php");
?>

修改

根据您的反馈，我改变了我的代码的底部位置：

$query=("SELECT * FROM stock where item='$type'");
$result=mysql_query($query);
$row=mysql_num_rows($result);
if($row=0)
{
    mysql_query("INSERT into stock (item, qty) VALUES ('$type', '$qty')");
    mysql_query("INSERT into purchase (type, qty, date) VALUES ('$type', '$qty', '$date')");
}
if($type==$row[1]) //$row[1] is item column in table
{
    mysql_query("UPDATE stock SET qty=qty+'$qty' WHERE item='$type'");
}
else
{
    mysql_query("INSERT into purchase (type, qty, date) VALUES ('$type', '$qty', '$date')");
    mysql_query("INSERT into stock (item, qty) VALUES ('$type', '$qty')");
}
header("location:purchasehistoryadmin.php");

在插入相同项目时仍然有重复的库存

Answer 1

您当前的查询会选择所有行，而不管项目是否相等。您需要修改查询，以便检查项目等于$type的那些行：

改变这个：

$query=mysql_query("SELECT * FROM stock");

要：

$query=mysql_query("SELECT * FROM stock WHERE item = '$type'");

Answer 2

您更正后的代码块： -

更正1： -

mysql_select_db('$db_name'); // here db_name treating as a string

应该是： -

mysql_select_db($db_name);

更正2： -

 $query=("SELECT * FROM stock");
 $result=mysql_query($query);

应该是： -

$query= "SELECT * FROM stock";
$result=mysql_query($query); // or you can directly write query here

完整的代码块： -

<?php

include("connect.php");

$host = "localhost";
$user = "root";
$pass = "";
$db_name = "proyek";
$tbl_name = "purchase";

mysql_connect($host, $user, $pass) or die("Cannot connect to SQL.");
mysql_select_db($db_name);

$type = (isset($_POST['type'])) ? $_POST['type'] : '';
$qty = (isset($_POST['qty'])) ? $_POST['qty'] : '';
$date = (isset($_POST['date'])) ? $_POST['date'] : '';

$query = "SELECT * FROM stock";
$result = mysql_query($query);
$row = mysql_num_rows($result);
if ($row == 0) {
    mysql_query("INSERT into stock (item, qty) VALUES ('$type', '$qty')");
    mysql_query("INSERT into purchase (type, qty, date) VALUES ('$type', '$qty', '$date')");
} else {
    mysql_query("INSERT into purchase (type, qty, date) VALUES ('$type', '$qty', '$date')");
    mysql_query("UPDATE stock SET qty=qty+'$qty' WHERE item='$type'");
}
header("location:purchasehistory.php");

最重要：请不要使用mysql_，因为它已在最新版本中弃用

php：插入和更新表

2 个答案: