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 [英] Warning: mysqli_stmt::bind_result(): Number of bind variables doesn't match number of fields in prepared statement error

问题描述

我有一个mysql查询，我将其转换为mysqli(准备好的语句)，但遇到一个引发以下错误的问题，

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,

Warning: mysqli_stmt::bind_result(): Number of bind variables doesn't match number of fields in prepared statement

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;

以下是我尝试过的方法，即使该方法无效.我已经知道它不起作用，但是我想在问一个问题之前自己尝试一下.错误是来自$get_empty_field = $stmt->bind_result($stmt);谁能帮助我找出问题出在哪里?

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); Can anyone help me figure out what went wrong?

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

您需要更改

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

收件人

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

$fieldx变量的数量等于所选字段的数量.如果您不知道有多少，请使用以下方法:

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，使用$data['field'];

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

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