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问题描述

我有一个 mysql 查询,我正在将其转换为 mysqli(准备好的语句),但遇到了一个问题,引发了以下错误,

I had a mysql query and I was converting it to mysqli(prepared statement) but I ran in to a problem which throws the below error,

警告:mysqli_stmt::bind_result():绑定变量的数量与准备好的语句中的字段数量不匹配

Mysql 代码

$random_name_generated = vpb_generate_random_name().'.jpg'; //Generated name for uploaded files or images

if (move_uploaded_file($_FILES['file_to_upload']['tmp_name'], $final_uploads_location)) {
    $check_empty_field = mysql_query("select * from `vpb_uploads` where `username` = '".mysql_real_escape_string(strip_tags($username))."'  and `firstname` = '".mysql_real_escape_string("")."' and `lastname` = '".mysql_real_escape_string("")."'");
    if (mysql_num_rows($check_empty_field) < 1) {
        mysql_query("insert into `vpb_uploads` values('', '".mysql_real_escape_string($username)."', '', '', '".mysql_real_escape_string($random_name_generated)."', '', '', '', '', '".mysql_real_escape_string(date("d-m-Y"))."')");

        $identity = "image_one";
    } else {
        $get_empty_field = mysql_fetch_array($check_empty_field);
        $image_one = strip_tags($get_empty_field["image_one"]);
        $image_two = strip_tags($get_empty_field["image_two"]);
        $image_three = strip_tags($get_empty_field["image_three"]);
        $image_four = strip_tags($get_empty_field["image_four"]);
        $image_five = strip_tags($get_empty_field["image_five"]);
        global $identity;

以下是我尝试过的,即使它不起作用.我已经知道它行不通,但我想在提问之前自己尝试一下.错误来自 $get_empty_field = $stmt->bind_result($stmt);

The below is what I tried even though it didn't work. I already knew it won't work but I wanted to try it myself before asking a question. And the error is coming from the $get_empty_field = $stmt->bind_result($stmt);

if (move_uploaded_file($_FILES['file_to_upload']['tmp_name'], $final_uploads_location)) {
    $firstname = '""';
    $lastname = '""';
    $stmt = $mysqli->prepare("select * from `vpb_uploads` where `username` = ?  and `firstname` = ? and `lastname` = ?");
    $stmt->bind_param('sss', $username, $firstname, $lastname);
    $stmt->execute();
    $stmt->store_result();
    if ($stmt->num_rows < 1) {
        $date = 'date("d-m-Y")';
        $image_2 = "''";
        $image_3 = "''";
        $image_4 = "''";
        $image_5 = "''";
        $stmt = $mysqli->prepare("insert into `vpb_uploads` (`username`, `firstname`, `lastname`, `image_one`, `image_two`, `image_three`, `image_four`, `image_five`, `date`) values(?,?,?,?,?,?,?,?,?)");
        $stmt->bind_param('sssssssss', $username, $firstname, $lastname, $random_name_generated, $image_2, $image_3, $image_4, $image_5, $date);
        $stmt->execute();
        $stmt->close();

        $identity = "image_one";
    } else {
        $get_empty_field = $stmt->bind_result($stmt);
        $image_one = strip_tags($get_empty_field["image_one"]);
        $image_two = strip_tags($get_empty_field["image_two"]);
        $image_three = strip_tags($get_empty_field["image_three"]);
        $image_four = strip_tags($get_empty_field["image_four"]);
        $image_five = strip_tags($get_empty_field["image_five"]);
        global $identity;

推荐答案

你需要改变

$get_empty_field = $stmt->bind_result($stmt);

$get_empty_field = $stmt->bind_result($field1, $field2, $field3);

$fieldx 变量的数量等于所选字段的数量.如果你不知道有多少,使用这个:

The number of $fieldx variables being equal to the number of fields that are selected. If you don't know how many there are, use this:

  // Throw an exception if the result metadata cannot be retrieved
  if (!$meta = $stmt->result_metadata())
  {
    throw new Exception($stmt->error);
  }

  // The data array
  $data = array();

  // The references array
  $refs = array();

  // Iterate over the fields and set a reference
  while ($name = $meta->fetch_field())
  {
    $refs[] =& $data[$name->name];
  }

  // Free the metadata result
  $meta->free_result();

  // Throw an exception if the result cannot be bound
  if (!call_user_func_array(array($stmt, 'bind_result'), $refs))
  {
    throw new Exception($stmt->error);
  }

然后在获取后访问结果,使用 $data['field'];

And then you access the result, after fetching, with $data['field'];

这篇关于警告:mysqli_stmt::bind_result():绑定变量的数量与准备好的语句错误中的字段数量不匹配的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-26 08:29