How to Seamlessly Transition from MySQL to MySQLi: A Step-by-Step Guide for Developers

Transition from MySQL to MySQLi: A Comprehensive Guide

As MySQL nears its deprecation, it's imperative for developers to upgrade to its successor, MySQLi. However, the transition can be daunting, especially for those accustomed to the MySQL syntax. This article provides a detailed guide on how to convert MySQL code to MySQLi, focusing on database querying techniques.

Querying with MySQLi

To convert MySQL querying syntax to MySQLi, follow these steps:

1. Instantiate a MySQLi connection:

   <code class="php">$connection = mysqli_connect("host", "username", "password", "database");</code>

2. Prepare the query:

   <code class="php">$sql_follows = "SELECT * FROM friends WHERE user1_id=? AND status=2 OR user2_id=? AND status=2";</code>

   Note the use of placeholders (?) for values that will be bound later.

3. Bind the values:

   <code class="php">$stmt = mysqli_prepare($connection, $sql_follows);
   mysqli_stmt_bind_param($stmt, "ii", $_SESSION['id'], $_SESSION['id']);</code>

4. Execute the query:

   <code class="php">mysqli_stmt_execute($stmt);</code>

5. Check for results:

   <code class="php">$result = mysqli_stmt_get_result($stmt);
   if (mysqli_num_rows($result) > 0) {
    // Query successful and has results
   } else {
    // Query successful but has no results
   }</code>

Converter Tools and Shim Library

For those facing challenges in converting their code, there are several resources available:

• MySQLConverterTool: This tool automates the conversion process. However, its generated code may require further refinement.
• MySQL Shim Library: This library allows developers to use the MySQL syntax while working with MySQLi.

Further Considerations

• Ensure that the server supports MySQLi before deploying your code.
• Replace deprecated functions with their MySQLi counterparts.
• Check for any exceptions or errors during the transition process.
• Thoroughly test your converted code to ensure its correct functionality.

By following these guidelines, you can successfully upgrade your code from MySQL to MySQLi and continue to work with database queries efficiently.

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