php - 从我页面的第二个表中删除行的问题

Question

我有一个包含 2 个表格的报告页面，一个显示库存商品，另一个显示已售商品。我为他们做了一个删除选项，它在表格的右端提供了一个按钮，用于从我的表格中删除行。我遇到的问题是该代码适用于第一个表，但对于第二个表，代码将执行但数据不会从数据库中删除。

我认为发生的事情是，由于我使用相同的代码从两个表中删除，所以只有 1 个有效。 (我想我不确定)在查看了一段时间后，试图找出我犯的潜在错误并试图查看其他可能的问题，我决定向您寻求帮助!

这里是代码:

<?php


$config['conn'] = array(
'host' => 'localhost',
'username' => 'root',
'password' => '',
'dbname' => 'inventarisdb'
);

$conn = new PDO('mysql:host=' . $config['conn']['host'] . ';dbname=' . $config['conn']['dbname'], $config['conn']['username'], $config['conn']['password']);


$action = isset($_GET['action']) ? $_GET['action']: "";

if($action=='delete'){ //if the user clicked ok, run our delete query
    try {

        $query = "DELETE FROM BCD WHERE id = ?";
        $stmt = $conn->prepare($query);
        $stmt->bindParam(1, $_GET['id']);

        $result = $stmt->execute();
        echo "<div>Record was deleted.</div>";

    }catch(PDOException $exception){ //to handle error
        echo "Error: " . $exception->getMessage();
    }

}

//select all data
$query = "SELECT ID, Categorie, SerieNummer, MacAdress, ProductCode, Prijs, RekNummer, PaletNummer, Hoeveelheid, Aantekeningen FROM BCD";
$stmt = $conn->prepare( $query );
$stmt->execute();

//this is how to get number of rows returned
$num = $stmt->rowCount();



if($num>0){ //check if more than 0 record found

    echo "<table border='1'>";//start table

        //creating our table heading
        echo "<tr>";
            echo "<th>Categorie</th>";
            echo "<th>SerieNummer</th>";
            echo "<th>MacAdress</th>";
            echo "<th>ProductCode</th>";
            echo "<th>Prijs</th>";
            echo "<th>RekNummer</th>";
            echo "<th>PaletNummer</th>";
            echo "<th>Hoeveelheid</th>";
            echo "<th>Aantekeningen</th>";
        echo "</tr>";

        //retrieve our table contents
        //fetch() is faster than fetchAll()
        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)){
            //extract row
            //this will make $row['firstname'] to
            //just $firstname only
            extract($row);

            //creating new table row per record
            echo "<tr>";
                echo "<td>{$Categorie}</td>";
                echo "<td>{$SerieNummer}</td>";
                echo "<td>{$MacAdress}</td>";
                echo "<td>{$ProductCode}</td>";
                echo "<td>{$Prijs}</td>";
                echo "<td>{$RekNummer}</td>";
                echo "<td>{$PaletNummer}</td>";
                echo "<td>{$Hoeveelheid}</td>";
                echo "<td>{$Aantekeningen}</td>";
                echo "<td>";


                    //we will use this links on next part of this post
                    echo "<a href='#' onclick='delete_user( {$ID} );'>Delete</a>";
                echo "</td>";
            echo "</tr>";
        }

    echo "</table>";//end table

}else{ //if no records found
    echo "No records found.";
}

?>

<script type='text/javascript'>

    function delete_user( id ){
        var answer = confirm('Are you sure?');
        if ( answer ){ //if user clicked ok
            //redirect to url with action as delete and id to the record to be deleted
            window.location = 'Remove.php?action=delete&id=' + id;
        }
    }
</script>

<br/><br/><br/><br/><br/><br/><br/><br/><br/>



<?php


$config['conn'] = array(
'host' => 'localhost',
'username' => 'root',
'password' => '',
'dbname' => 'inventarisdb2'
);

$conn = new PDO('mysql:host=' . $config['conn']['host'] . ';dbname=' . $config['conn']['dbname'], $config['conn']['username'], $config['conn']['password']);


$action = isset($_GET['action']) ? $_GET['action']: "";

if($action=='delete'){ //if the user clicked ok, run our delete query
    try {

        $query = "DELETE FROM CDE WHERE id = ?";
        $stmt = $conn->prepare($query);
        $stmt->bindParam(1, $_GET['id']);

        $result = $stmt->execute();
        echo "<div>Record was deleted.</div>";

    }catch(PDOException $exception){ //to handle error
        echo "Error: " . $exception->getMessage();
    }

}

//select all data
$query = "SELECT ID2, Klant, Categorie1, SerieNummer1, MacAdress1, ProductCode1, Prijs1, Hoeveelheid1, Aantekeningen1 FROM CDE";
$stmt = $conn->prepare( $query );
$stmt->execute();

//this is how to get number of rows returned
$num = $stmt->rowCount();



if($num>0){ //check if more than 0 record found

    echo "<table border='1'>";//start table

        //creating our table heading
        echo "<tr>";
            echo "<th>Klant</th>";
            echo "<th>Categorie1</th>";
            echo "<th>SerieNummer1</th>";
            echo "<th>MacAdress1</th>";
            echo "<th>ProductCode1</th>";
            echo "<th>Prijs1</th>";
            echo "<th>Hoeveelheid1</th>";
            echo "<th>Aantekeningen1</th>";
        echo "</tr>";

        //retrieve our table contents
        //fetch() is faster than fetchAll()
        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)){
            //extract row
            //this will make $row['firstname'] to
            //just $firstname only
            extract($row);

            //creating new table row per record
            echo "<tr>";
                echo "<td>{$Klant}</td>";
                echo "<td>{$Categorie1}</td>";
                echo "<td>{$SerieNummer1}</td>";
                echo "<td>{$MacAdress1}</td>";
                echo "<td>{$ProductCode1}</td>";
                echo "<td>{$Prijs1}</td>";
                echo "<td>{$Hoeveelheid1}</td>";
                echo "<td>{$Aantekeningen1}</td>";
                echo "<td>";

                    //we will use this links on next part of this post
                    echo "<a href='#' onclick='delete_user( {$ID2} );'>Delete</a>";
                echo "</td>";
            echo "</tr>";
        }

    echo "</table>";//end table

}else{ //if no records found
    echo "No records found.";
}

?>

<script type='text/javascript'>

    function delete_user( id ){
        var answer = confirm('Are you sure?');
        if ( answer ){ //if user clicked ok
            //redirect to url with action as delete and id to the record to be deleted
            window.location = 'Remove.php?action=delete&id=' + id;
        }
    }
</script>

简而言之:第一个表:一切正常，所有数据都被删除 第 2 个表:似乎可以正常工作，但在确认删除后，数据仍然存在并且没有从我的数据库中删除。

表2的代码与表1的代码完全相同，除了DB和表的名称等。

我希望您能查看我的代码，看看您是否注意到任何可能导致此问题的原因。也许如果你同意我的想法，相同的代码不适用于同一页面上的两个表，你可以举一个例子或一个链接来说明我如何解决这个问题？对不起，长代码!先谢谢你!

Answer 1

你不应该混合删除，因为你可能有一个 id 与另一个相同的实例，所以你会删除错误的东西。但我不认为这是你的主要问题:

你的选择是

SELECT ID2, Klant, Categorie1, SerieNummer1, MacAdress1, ProductCode1, Prijs1, Hoeveelheid1, Aantekeningen1 FROM CDE

但是你的删除是:

DELETE FROM CDE WHERE id = ?";

你要删除的应该是:

DELETE FROM CDE WHERE ID2 = ?";

防止误删:

这里最简单的事情就是更改您要删除用户的 JavaScript 以接受操作参数并指定要执行的删除操作，因为这两个删除尝试现在都在运行。

JavaScript

您不需要在同一页面上使用 JavaScript 两次。只需在您的 HEAD 或正文末尾之前使用一次即可。

<script type='text/javascript'>
    function delete_user( action, id ){
        var answer = confirm('Are you sure?');
        if ( answer ){ //if user clicked ok
            //redirect to url with action as delete and id to the record to be deleted
            window.location = 'Remove.php?action=' + action + '&id=' + id;
        }
    }
</script>

检查操作

if ($action=='delete_BCD') { 
// or
if ($action=='delete_CDE') { 

渲染行

echo "<a href='#' onclick='delete_user( \"delete_BCD\", {$ID2} );'>Delete</a>";
// or
echo "<a href='#' onclick='delete_user( \"delete_CDE\", {$ID2} );'>Delete</a>";