How to Migrate Your Code from MySQL to MySQLi: A Step-by-Step Guide

Converting MySQL to MySQLi: A Guide for Migrating Your Code

Due to the deprecation of MySQL, it's crucial to upgrade to MySQLi for the best database interaction experience. While this transition may seem daunting, especially with a large codebase using MySQL, we'll provide a detailed explanation to help you make the conversion effortlessly.

One common task when working with databases is querying data. Here's an example of a SQL query written in MySQL:

$sql_follows = "SELECT * FROM friends WHERE user1_id=" . $_SESSION['id'] . " AND status=2 OR user2_id=" . $_SESSION['id'] . " AND status=2";

To convert this query to MySQLi, you can follow these steps:

1. Create a MySQLi Connection:

$connection = mysqli_connect("localhost", "username", "password", "database_name");

2. Prepare the Query Statement:

$query = "SELECT * FROM friends WHERE user1_id=? AND status=? OR user2_id=? AND status=?";

3. Bind Parameters to Prevent SQL Injections:

$stmt = mysqli_prepare($connection, $query);
mysqli_stmt_bind_param($stmt, 'iiii', $_SESSION['id'], 2, $_SESSION['id'], 2);

4. Execute the Prepared Statement:

mysqli_stmt_execute($stmt);

5. Retrieve Results (if applicable):

$result = mysqli_stmt_get_result($stmt);
while ($row = mysqli_fetch_array($result, MYSQLI_ASSOC)) {
    // Process row data
}

Additional Tools:

• MySQL Converter Tool: This tool simplifies the conversion process by automatically generating the MySQLi code from your MySQL code. However, it's recommended to manually review the generated code.
• MySQL Shim Library: This library allows you to use MySQL functions with the MySQLi interface. It provides a compatibility layer that can make the migration process more convenient.

By following these steps and leveraging the provided resources, you can effectively convert your code from MySQL to MySQLi, ensuring compatibility and improved database performance for your application.

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