How to Effectively Convert MySQL Code to MySQLi?

Converting MySQL to MySQLi: A Step-by-Step Guide

Introduction

As a developer transitioning to MySQLi from MySQL, it's crucial to understand the differences between the two APIs. One common question is whether simply replacing "mysql_query($sql);" with "mysqli_query($sql);" will suffice.

Answer and Conversion

While this substitution may work in some cases, it's not always sufficient. To convert your code from MySQL to MySQLi effectively, follow these steps:

1. Replace MySQL_ Functions with MySQLi_ Equivalents:

   Use the MySQLi Extension Function Summary as a reference. For example:

   • mysql_connect -> mysqli_connect
   • mysql_error -> mysqli_error/mysqli_connect_error (depending on context)
   • mysql_query -> mysqli_query

2. Handle Parameter Differences:

   Some functions may have different parameter requirements. For instance:

   • mysql requires mysql_select_db to specify the database.
   • mysqli allows you to specify the database as the fourth parameter to mysqli_connect or use mysqli_select_db.

3. Execute the Updated Code:

   After making the necessary changes, execute your script to verify functionality. Address any errors that arise.

Additional Tips:

• Use a source control system to track your changes and prevent accidental regressions.
• Test your code thoroughly before deploying it to ensure compatibility.
• Consider using PHP's PDO (PHP Data Objects) for an object-oriented approach to database interactions.

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