Question

我试图从数据库中删除一些信息，但当我要求用户确认操作时，出现了问题。你能救我吗？

脚本打印类别以选择是否结算。然后，它要求用户删除或不删除所选的类别。最后，它删除了所选择的内容。

但是最后一部分（脚本中的第一部分）出现了一些错误，我无法理解它出错的地方：

    <?php
//If the user confirm to delete...
    if(isset($_POST['eliminazione_conferma']) and $_POST['eliminazione_conferma']=='conferma'){
//if conferma_eliminazione=1, don't delete
        if(isset($_POST['conferma_eliminazione']) and $_POST['conferma_eliminazione']=='1'){
                echo 'Eliminazione annullata';
            }else{//Delete if conferma_eliminazione=0
                while($row=$categoria){
                    $delete= "DELETE FROM categorie WHERE $row = category_id";
                    $query=mysql_query($delete);
                    echo "$row eliminato\n";
                }
            }
    }else{//ELSE, print the form to confirm action
    if(isset($_POST['eliminazione']) and $_POST['eliminazione']=='delete'){
//Array with the chosen "categories"
        $categoria=isset($_POST['categoria']) ? $_POST['categoria'] : array();
//Print the chosen categories to ask confirmation
        echo'Sicuro di voler eliminare le seguenti categoire?<br />';
        foreach($categoria as $row){
            echo "$row<br />\n";
        }
//Yes = 0, No = 1
        echo '<form method="post" action="',$_SERVER['REQUEST_URI'],'">
        <input type="radio" name="conferma_elimiazione" value="0" />Si<br />
        <input type="radio" name="conferma_eliminzione" value="1" />No<br />
        <input type="hidden" name="eliminazione_conferma" value="conferma" />';

        foreach($categoria as $row){
            echo'<input type="hidden" name="categoria[]" value="',$row,'" />',"\n",'' ;
        }   
        echo'
        <input type="submit" value="Conferma" />
        </form>';
        }else{//In the end, if nothing is settled, print the form to check the category to delete
//Select the categories from the database
        echo'<form method="post" action="',$_SERVER['REQUEST_URI'],'" />',"\n",'';
    $select = "SELECT nome,category_id FROM categorie ORDER BY category_id" ;
    $select_result=mysql_query($select) or die("Mysql Error: ".mysql_error());
    while($row = mysql_fetch_assoc($select_result)){
        echo '<input type="checkbox" name="categoria[]" value="',$row['category_id'],'">',$row['nome'],'<br />';

    }
    echo'<input type="hidden" name="eliminazione" value="delete" />
    <input type="submit" name="submit" value="Elimina" />
    </form>';
    }
    }

Answer 1

查询问题

$delete= "DELETE FROM categorie WHERE $row = category_id";

是

这里

WHERE $row = category_id";

什么是category_id？

你有价值吗？

您可能需要WHERE category_id=/*something here like $row['column_name']*/

Answer 2

感谢大家的帮助，但我已经用这种方式解决了我的问题（脚本并没有改变＆＃34; conferma_eliminazione＆＃34;在整数类型中的值）：

<h2>Modifica o Elimina Categoria </h2>
<?php
if(isset($_POST['eliminazione_conferma']) and $_POST['eliminazione_conferma']=='conferma'){
        $categoria=isset($_POST['categoria']) ? $_POST['categoria'] : array();
        $a=(int)$_POST['eliminazione'];
                if($a=='1'){
            echo 'Eliminazione annullata';
            echo "\n";
        }elseif($a=='0'){
            foreach($categoria as $row){
                $delete= "DELETE FROM categorie WHERE $row = category_id";
                $query=mysql_query($delete);
                echo "$row eliminato\n";
            }
        }
}else{
if(isset($_POST['eliminazione']) and $_POST['eliminazione']=='delete'){

    $categoria=isset($_POST['categoria']) ? $_POST['categoria'] : array();
    echo'Sicuro di voler eliminare le seguenti categoire?<br />';
    foreach($categoria as $row){
        echo '',$row,'<br />',"\n";
    }
    echo '<form method="post" name="form_eliminazione_categoria" action="',$_SERVER['REQUEST_URI'],'">',"\n",'
    <input type="radio" name="eliminazione" value="0" />Si<br />' ,"\n",'
    <input type="radio" name="eliminazione" value="1" />No<br />',"\n",'
    <input type="hidden" name="eliminazione_conferma" value="conferma" />',"\n",'';
    foreach($categoria as $row){
        echo '<input type="hidden" name="categoria[]" value="',$row,'" /><br />',"\n",'';
    }
    echo'
    <input type="submit" value="Conferma" />
    </form>';
    }else{
    echo'<form method="post" action="',$_SERVER['REQUEST_URI'],'" />',"\n",'';
$select = "SELECT nome,category_id FROM categorie ORDER BY category_id" ;
$select_result=mysql_query($select) or die("Mysql Error: ".mysql_error());
while($row = mysql_fetch_assoc($select_result)){
    echo '<input type="checkbox" name="categoria[]" value="',$row['category_id'],'">',$row['nome'],'<br />';
    echo "\n";
}
echo'<input type="hidden" name="eliminazione" value="delete" />',"\n",'
<input type="submit" name="submit" value="Elimina" />',"\n",'
</form>';
}
}

从DB中删除数据时出错

2 个答案: