用条件插入数据库

Question

当我将book_Status从表格book更新为AVAILABLE时，我无法将reserve_Status更改为RESERVED。我的剧本出了什么问题？

reserve.php ：

<?php
        include 'dbconnect.php';

        $query1 ="  
                    SELECT b.book_Status, r.reserve_Status

                    FROM book b
                    JOIN reservations r
                    ON r.book_Accession = b.book_Accession
                    ";


        $result1 = mysql_query($query1) or die('SQL error');
        $row1 = mysql_fetch_array($result1, MYSQL_ASSOC);

        if ($row1['book_Status'] == 'Available')
        {
            $Reserved = "Reserved";

        }               
        $query2 = "INSERT INTO reservations
                        WHERE reserve_Status = '$Reserved' ";

?>

Answer 1

您需要update query。并将该查询移到您的if语句

中

if ($row1['book_Status'] == 'Available')
        {
            $Reserved = "Reserved";
$query2 = "UPDATE reservations SET reserve_status = 'reserved' WHERE book_Status='Available'";

        }     

Answer 2

问题是您更改了变量$Reserved的值，但未查询数据库以执行更新。