Question

我正在尝试删除数据库中的多个条目。我正在使用复选框来确定我需要删除哪些数据。勾选复选框后，它会向我发送我用来删除它的主键值。到目前为止，我已经提出了这个

当我尝试删除单个或多个数据时，它直接进入成功页面，成功计算已删除玩家的预期数量。但是当我显示所有表格时没有任何反应。

HTML / PHP代码

            <?php
                $self = htmlentities($_SERVER['PHP_SELF']);
                echo "<form id='delete' method='POST' action='$self'>";
            ?>
    <div class="content">                   
            <h3>Delete Athlete</h3>
            <hr>
            <table>
                <tr>
                    <th>Select Player</th><th>Photo</th><th>First Name</th><th>Last Name</th><th>Gender</th><th>Sport</th><th>Country</th><th>Population</th><th>Flag</th>
                </tr>
                    <?php
                        foreach($showResult as $row)
                        {
                            echo("<tr><td><input type='checkbox' name='checkdelete[]' value='$row[athleteID]'>$row[athleteID]</td>
                            <td><img class='photo' src='files/$row[image]' alt='$row[lastName].jpg'/></td>
                            <td>$row[firstName]</td><td>$row[lastName]</td>
                            <td><img class='genderImg' src='files/$row[gender].png' alt='$row[gender].jpg'/></td>
                            <td>$row[sport]</td><td>$row[countryName]</td><td>$row[population]</td>
                            <td><img class = 'flag' src='files/flags/$row[flag]' alt='$row[flag].jpg'/></tr>");
                        }
                    ?>                      
            </table>    
    <br><input type="submit" name="deleteAth" value="Delete">               
    </div>
</body>

我有PHP的这段代码

<?php

包括'connect.inc.php';

try   // select statement for the output page/delete page
{
    $showJoinedTbl = "SELECT athleteID,image, firstName, lastName, gender, sport, 
    countryName, population, flag from athTbl join
    counTbl on athTbl.countryID = counTbl.countryID ORDER by firstName";
    $showResult = $pdo->query($showJoinedTbl);
}
catch (PDOException $e)
{
    $error = 'Select statement error';
    include 'error.html.php';
    exit();
}
$dataCorrect = true;
if (isset($_POST['deleteAth']))
{           
    try
    {
        $valueID = $_POST['checkdelete'];
        $N = count ($valueID);
        for ($i=0; $i; $i++)
        {
            $deleteQry = $db->prepare("DELETE from athTbl WHERE athleteID= ?");
            echo ("$valueID[$i]");

            //$stmt = $pdo->prepare($deleteQry);
            $stmt->bindValue(1,$valueID[$i]);
            $stmt->execute();
        }   //when I try to delete single or multiple data, it goes straight to success page which successfully count the number of intended amount of deleted player. But nothing happens when I show all tables.
    }
    catch (PDOException $e)
    {
        $error = 'Error deleting data from athleteTbl';
        include 'error.html.php';
        exit();
    }
    include 'DeleteSuccess.html.php';           // output screen if I deleted it successfully.
}
else
{
    include 'Delete.html.php';
}   
?>

Answer 1

你的循环中有错误：

...
$N = count ($valueID);
for ($i=0; $i; $i++)
           ^^ 0 on the first iteration
{
     ...

当条件（中间值）为true时，您的循环将运行。您将$i设置为0，其值为false，因此您的循环永远不会运行。

或者，来自manual：

在每次迭代开始时，将评估expr2。如果它计算结果为TRUE，循环继续，嵌套语句为执行。如果计算结果为FALSE，则循环的执行结束。

你可能想要：

...
$N = count ($valueID);
for ($i=0; $i < $N; $i++)
{
     ...

使用PDK，PHP和MYSQL使用primaryKey＆amp;删除语句。复选框

1 个答案: