How To Get The Raw SQL Query From Laravel's Query Builder?

Implementing toSql() for Raw SQL Retrieval

The toSql() method gets the raw SQL query from Laravel's Query Builder. This method returns the SQL string without running the query.

To use toSql(), add it to the end of your query chain:

$query = DB::table('users')->toSql();

This will return the SQL string that would run if you called get() or first() instead.

For example, DB::table('users')->toSql() returns:

select * from `users`

You can also use toSql() with more complex queries:

$query = DB::table('users')
    ->where('active', 1)
    ->whereIn('role', ['admin', 'moderator'])
    ->toSql();

This would return:

select * from `users` where `active` = ? and `role` in (?, ?)

Note that toSql() doesn't include the actual values for security reasons. It uses question marks as placeholders for the values.

Remember, toSql() only shows the SQL query. It doesn't run the query or return any data from the database. This makes it useful for checking your queries without changing your database.

$query = DB::table('users')->where('active', 1)->whereIn('role', ['admin', 'moderator']);
$sql = $query->toSql();
$bindings = $query->getBindings();

dd($sql, $bindings);

Using DB::getQueryLog()

Laravel has a query logging feature that can help you get SQL queries executed during a request. Here's how to use it:

1. Enable query logging at the start of your script or in a service provider:

DB::enableQueryLog();

2. Run your database queries as usual.

3. Get the log of all executed queries:

$queries = DB::getQueryLog();

This method returns an array of all queries, including the SQL, bindings, and execution time.

Note that query logging can affect performance, so use it only during development or debugging.

DB::enableQueryLog();
// Your database queries here
$queries = DB::getQueryLog();
DB::disableQueryLog();

Implementing Event Listeners

Laravel also lets you capture SQL queries by setting up event listeners. This method gives you more control over when and how you capture queries. Here's how to do it:

1. Create an event listener in your EventServiceProvider:

protected $listen = [
    'Illuminate\Database\Events\QueryExecuted' => [
        'App\Listeners\QueryExecutedListener',
    ],
];

2. Create the listener class:

namespace App\Listeners;

use Illuminate\Database\Events\QueryExecuted;

class QueryExecutedListener
{
    public function handle(QueryExecuted $event)
    {
        $sql = $event->sql;
        $bindings = $event->bindings;
        $time = $event->time;

        // Log or process the query as needed
    }
}

This listener will capture every executed SQL query, allowing you to log or process them as needed.

public function handle(QueryExecuted $event)
{
    if (strpos($event->sql, 'users') !== false) {
        Log::info('User query executed:', [
            'sql' => $event->sql,
            'bindings' => $event->bindings,
            'time' => $event->time
        ]);
    }
}

Both methods provide ways to access raw SQL queries, but they capture all queries rather than just the one you're working on. Use these methods when you need to analyze multiple queries or when you can't modify the original query code.