How to Write Raw Query In Laravel in 2024?

To write a raw query in Laravel, you can use the DB facade provided by Laravel. You can use the select, insert, update, delete, and statement methods to write raw SQL queries.

For example, to select data from a table using a raw query, you can use the select method like this:

1	$results = DB::select('SELECT * FROM users');

You can also bind parameters to the query using the select method like this:

1	$results = DB::select('SELECT * FROM users WHERE id = ?', [1]);

Similarly, you can use the insert, update, and delete methods to write raw insert, update, and delete queries in Laravel.

It's important to note that writing raw queries bypasses Laravel's query builder and ORM, so you need to be careful when writing raw queries to avoid vulnerabilities like SQL injection.

How to write a raw query with subqueries in Laravel?

You can use the DB facade in Laravel to write raw SQL queries with subqueries. Here is an example of how you can do that:

$query = DB::select("SELECT * FROM table1 WHERE column1 IN 
    (SELECT column2 FROM table2 WHERE condition)");

foreach ($query as $result) {
    // do something with the result
}

In this example, we are selecting all rows from table1 where column1 is in the result of a subquery that selects column2 from table2 based on a certain condition.

Make sure to sanitize and validate input data to prevent SQL injection attacks when using raw SQL queries.

What is the difference between PDO and raw queries in Laravel?

PDO (PHP Data Objects) is a lightweight and consistent interface for accessing databases in PHP. In Laravel, PDO is used to execute raw SQL queries directly on the database.

Raw queries, on the other hand, refer to SQL queries that are written directly in code without using Laravel's query builder methods. You can use raw queries in Laravel by using the DB::statement() method.

The main difference between PDO and raw queries in Laravel is that PDO allows you to interact with the database using a consistent object-oriented interface, while raw queries allow you to write and execute SQL queries directly in your code. PDO provides a more secure way to interact with the database, as it automatically escapes input to prevent SQL injection attacks. However, raw queries give you more control over the queries you want to execute and can be more flexible in certain situations.

How to write a raw query with limit and offset in Laravel?

You can write a raw query with limit and offset in Laravel using the DB facade. Here's an example:

use Illuminate\Support\Facades\DB;

$results = DB::select(DB::raw("SELECT * FROM your_table LIMIT :limit OFFSET :offset"), [
    'limit' => 10,
    'offset' => 20
]);

In this example, we are using the DB::raw method to write a raw SQL query with a LIMIT and OFFSET clause. We use the DB::select method to execute the query and pass an array of bindings that includes the values of the limit and offset placeholders in the query.

This will return the results of the query with a limit of 10 rows starting from the 20th row.

How to write a raw query leveraging Laravel's query builder structure?

To write a raw query leveraging Laravel's query builder structure, you can use the DB facade. Here is an example of how you can write a raw query using Laravel's query builder structure:

use Illuminate\Support\Facades\DB;

$results = DB::select('SELECT * FROM users WHERE id = ?', [1]);

foreach ($results as $user) {
    echo $user->name;
}

In this example, we are using the DB::select method to execute a raw SQL query that selects all columns from the users table where the id is equal to 1. We are also passing an array of bindings to prevent SQL injection attacks.

You can also use other methods provided by the DB facade, such as insert, update, delete, etc., to perform different types of raw queries. Just make sure to sanitize input data and use parameter binding to avoid SQL injection vulnerabilities.

How to bind parameters to a raw SQL query in Laravel?

You can bind parameters to a raw SQL query in Laravel using the following syntax:

1
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$query = "SELECT * FROM users WHERE id = :id";

$users = DB::select($query, ['id' => 1]);

In this example, the :id placeholder in the raw SQL query is replaced with the actual value of the id parameter that is passed as an array in the select method. Laravel will automatically sanitize the input to prevent SQL injection attacks.

How to debug raw queries in Laravel?

Debugging raw queries in Laravel can be done by using the toSql() method on a query builder instance before executing the query. This method returns the raw SQL query that will be executed when the get() or first() method is called.

Here's an example of how you can debug raw queries in Laravel:

Build your query using the query builder methods:

$query = DB::table('users')
    ->select('name', 'email')
    ->where('active', true)
    ->orderBy('created_at', 'desc');

Use the toSql() method to get the raw SQL query:

1 2	$sql = $query->toSql(); dd($sql);

Execute the query with the get() or first() method:

1	$results = $query->get();

By using the toSql() method, you can easily debug and see the actual SQL query that will be executed by Laravel. This can help you identify any issues with your query and make debugging easier.

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How to Write Raw Query In Laravel?