Question

有谁能看到这个脚本有什么问题？我已经验证数据是在$ _POST数组中，并且查询字符串也是正确形成的，但由于某种原因，当执行此操作时，要更新的列将在数据库中清空。

/* Get the ID for the house to be modified by using a hidden-field 'hiddenDescription' */
$stmt = $db->prepare('SELECT id FROM talot WHERE kuvaus = :description');
$stmt->bindParam(':description', $_POST['hiddenDescription'], PDO::PARAM_STR);
$stmt->execute();
if($row = $stmt->fetch(PDO::FETCH_ASSOC)){
    // The column names in the database
    $col_names = array("kaupunki", "osoite", "pintaAla", "koko", "vuosi", "hinta", "otsikko", "kuvaus", "valittaja");
    $comma = ",";
    $i = 0;
    $unprepared = 'UPDATE talot SET ';
    /* Go through the POST -array and add the column name and :$key (for binding) into the query string. Also add comma  */
    foreach($_POST as $key => $value){
        if(!empty($_POST[$key])){
            // Skip hiddenDescription
            if($key != 'hiddenDescription'){
                $unprepared .= "$col_names[$i] = :$key".$comma;
            }
            // If $key was hiddenDescription decrement $i;
            else{
                $i--;
            }
        }
        $i++;
    }
    // chop the last comma.
    $prepared = chop($unprepared, ',');
    $prepared .= ' WHERE id = :id';
    $stmt = $db->prepare($prepared);
    $i = 0;
    /* Go through the POST -array and bind values that are not empty. Again skip hiddenDescription. */
    foreach($_POST as $key => $value){
        if(!empty($value)){
            if($key != 'hiddenDescription'){
                $stmt->bindParam(":$key", $value, PDO::PARAM_STR);
            }
            else{
                $i--;
            }
        } 
        $i++;
    }
    // Bind the ID received in the first database query.
    $id = (int)$row['id'];
    $stmt->bindParam(":id", $id, PDO::PARAM_INT);
    $result = $stmt->execute();
    if($result){
        echo 1;
    }

谢谢！

Answer 1

好吧..解决了这个嘿嘿。

此：

foreach($_POST as $key => $value){
    if(!empty($value)){
        if($key != 'hiddenDescription'){
            $stmt->bindParam(":$key", $value, PDO::PARAM_STR);
        }
        else{
            $i--;
        }
    } 
    $i++;
}

改为：

foreach($_POST as $key => &$value){
if(!empty($value)){
    if($key != 'hiddenDescription'){
        $stmt->bindParam(":$key", $value, PDO::PARAM_STR);
    }
    else{
        $i--;
    }
} 
$i++;

}

（bindParam需要＆amp; $ variable）：

PDO UPDATE查询删除值而不是更新

1 个答案: