Prepared Statements for PHP: Identifying the Problem-PHP Tutorial-php.cn

Prepared Statements for PHP: Identifying the Problem

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Release： 2023-08-30 08:30:01

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PHP 的准备语句：识别问题

PHP's prepared statements (for database access) are great. Not only do they help protect your database queries, but they are especially more effective for larger products. However, there are some issues that seem to make these methods less flexible than we would like. First, we have to use the bind_result method and pass in a specific number of variables. But what happens when this code is in a class and we don't immediately know how many variables to pass? Fortunately, there is a solution! I'm going to show you what it is in today's video tutorial.

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Final code

<?php

function read()
{
   $parameters = array();
   $results = array();

   $mysql = new mysqli('localhost', 'root', 'root', 'db') or die('There was a problem connecting to the database');
   $stmt = $mysql->prepare('SELECT body FROM posts') or die('Problem preparing query');
   $stmt->execute();

   $meta = $stmt->result_metadata();

   while ( $field = $meta->fetch_field() ) {

     $parameters[] = &$row[$field->name]; 
   }

   call_user_func_array(array($stmt, 'bind_result'), $parameters);

   while ( $stmt->fetch() ) {
      $x = array();
      foreach( $row as $key => $val ) {
         $x[$key] = $val;
      }
      $results[] = $x;
   }

   return $results;


}

$results = read();
?>
<!DOCTYPE html>

<html lang="en">
<head>
   <meta charset="utf-8">
   <title>untitled</title>
</head>
<body>
<?php foreach ($results as $row) : ?>

   <p> <?php echo $row['body']; ?> </p>
<?php endforeach; ?>
</body>
</html>

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