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How do frameworks like Kohana's ORM and Query Builder contribute to achieving database independence and optimizing performance in PHP applications?

Frameworks like Kohana's ORM and Query Builder help achieve database independence by abstracting the database operations, allowing developers to write code that is not tied to a specific database system. This means that switching between different database systems (e.g., MySQL, PostgreSQL) becomes easier without having to rewrite a significant portion of the code. Additionally, these frameworks optimize performance by generating efficient SQL queries, handling database connections, and providing caching mechanisms.

php 
// Example using Kohana's Query Builder to achieve database independence and optimize performance

// Initialize the Query Builder
$query = DB::select()
            ->from('users')
            ->where('status', '=', 1)
            ->order_by('created_at', 'DESC')
            ->limit(10);

// Execute the query
$results = $query->execute();

// Loop through the results
foreach($results as $row) {
    echo $row['username'] . '<br>';
}

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