Question

使用prepare语句我只获取一行，我试着循环所有行，但只有一行女巫被提取。请帮助我如何获取数据库中的所有行而不是一行

PHP函数： .....

  public function StudentsOfParent($mobile){
 $stmt = $this->conn->prepare("SELECT
                         a.id,
                         a.name, 
                         a.mobile, 
                         c.id as sutdentId, 
                         c.user_id, 
                         c.full_name, 
                         c.school, 
                         c.level,
                         c.year,
                         c.id                    
                         from users a 
                         join students c 
                         on a.id = c.user_id where a.mobile= ?");

    $stmt->bind_param("i", $mobile);
    if ($stmt->execute()) {

   while ($user = $stmt->get_result()->fetch_assoc())
            {
        $stmt->close();

            // return user's results
            return $user;
                }
            }
        else {
        return NULL;
    }
}
  .....

用于访问上述功能的外部php文件：retrieve.php：

  <?php 
  include './DbHandler.php';
   $db = new DbHandler(); 
    // json response array
  $response = array("error" => FALSE);
     if (isset($_POST['mobile'])){
  $mobile = $_POST['mobile']; 
   $user = $db->StudentsOfParent($mobile);
    if ($user != false) {            
      // user found successfully
        $response["error"] = FALSE;
        $response["user"]["id"] = $user["id"];
 $response["user"]["sutdentId"] = $user["sutdentId"];
 $response["user"]["user_id"] = $user["user_id"];
 $response["user"]["full_name"] = $user["full_name"];
 $response["user"]["school"] = $user["school"];
 $response["user"]["level"] = $user["level"];
 $response["user"]["year"] = $user["year"];
        // $response["user"]["photo"] = $user["photo"];
                     echo json_encode($response);
         // $json = json_encode($response);
    }    else {
    // user is not found with the credentials
    $response["error"] = TRUE;
    $response["error_msg"] = "Sorry we could not find you !";
    echo json_encode($response);
   }
    } 
   else {
    // required post params is missing
   $response["error"] = TRUE;
    $response["error_msg"] = "Required parameter is missing!";
   echo json_encode($response);
   }
  ?>

Answer 1

使用prepare语句我只获取一行，我试着循环所有行，但只有一行是女性被提取。

那是因为你在$user循环本身的第一次迭代中返回while，循环甚至不会继续进行第二次迭代。另外，您还在第一次迭代中关闭语句对象$stmt->close();。相反，您的代码块应该是这样的：

// your code
if ($stmt->execute()) {
    $result = $stmt->get_result();
    $usersArr = array();
    while ($user = $result->fetch_assoc()){
        $usersArr[] = $user;
    }
    $stmt->close();
    return $usersArr;
} else {
    return NULL;
}
// your code

现在返回的$usersArr数组是一个多维数组，您需要适当地循环以获取所有用户的详细信息。如果要查看完整的数组结构，请执行var_dump($usersArr);。

如何使用预准备语句从mysql中获取多行

1 个答案: