Question

我有一个可拖动的div，其位置被保存到数据库中。但是当我尝试查询数据库时，它并没有回应最后的位置。这里有什么我想念的吗？任何输入都非常感谢。

更新：我已经重写了下面的代码，现在一切正常了

global $wpdb;

$user_exists = $wpdb->get_row($wpdb->prepare("SELECT * FROM coords WHERE user_id = %d", $current_user->ID));

if($user_exists) {
  echo "<div id='draggable' style='left:".$user_exists->x_pos."px; top:".$user_exists->y_pos."px;' class='flex_cell_inner'>";

}else{

  echo "<div id='draggable' class='flex_cell_inner'>";
    };

以下是我用于将数据保存到数据库的代码。但是我在前端更新div位置时遇到问题：

global $wpdb;

    $_POST['user_id'];
    $_POST['div_id'];
    $_POST['x_pos'];
    $_POST['y_pos'];

    $user_id    = $_POST['user_id'];
    $div_id     = $_POST['div_id'];
    $x_pos      = $_POST['x_pos'];
    $y_pos      = $_POST['y_pos'];

$wpdb->query($wpdb->prepare(" INSERT INTO coords

(user_id, div_id, x_pos, y_pos)
    VALUES (%d, %s, %d, %d)
    ON DUPLICATE KEY UPDATE
    x_pos = VALUES(x_pos), y_pos = VALUES(y_pos)",

    $user_id,
    $div_id,
    $x_pos,
    $y_pos
    ));

Answer 1

试试这个

function userIdExists($user_id){
    global $wpdb;
    $count = $wpdb->get_var($wpdb->prepare("SELECT COUNT(*) FROM $wpdb->users WHERE ID = %d",$user_id));
    if($count == 1){ return true; }else{ return false; }
}

使用if condition

调用此函数

if(userIdExists($user_id)){
     echo "<div id='draggable' style='left: ".$x_pos."px; top: ".$y_pos."px;' class='flex_cell_inner'>";
}else{
     echo "<div id='draggable' class='flex_cell_inner'>";
}

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1 个答案: