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Learn SQL By Examples: Examples of SQL Queries and Stored Procedures for MySQL and Oracle Databases
To write an SQL query in Laravel, you can use the query builder provided by Laravel's Eloquent ORM. The query builder allows you to interact with your database using an intuitive PHP syntax instead of writing raw SQL statements.
You can use methods such as select, from, where, join, orderBy, groupBy, having, and limit to build your query. For example, to fetch data from a users table where the id is equal to 1, you can write the following query:
$user = DB::table('users')->where('id', 1)->first();
You can also use Eloquent models to interact with your database. By defining a model that extends Laravel's Model class, you can perform database operations using object-oriented syntax. For example, to retrieve all users from the users table, you can write:
$users = User::all();
Overall, Laravel provides a powerful and flexible way to write SQL queries, making it easier to work with databases in your PHP applications.
What is the order by clause in Laravel queries?
The order by clause in Laravel queries is used to sort the results of a query in ascending or descending order based on one or more columns. It is typically used in conjunction with the orderBy() method in Laravel's query builder.
For example, the following code snippet sorts users by their name in ascending order:
$users = DB::table('users') ->orderBy('name') ->get();
You can also specify the sort direction by providing a second argument to the orderBy() method:
$users = DB::table('users') ->orderBy('created_at', 'desc') ->get();
In this example, the query sorts users by their created_at column in descending order.
You can also chain multiple orderBy() calls to sort by multiple columns:
$users = DB::table('users') ->orderBy('name') ->orderBy('created_at', 'desc') ->get();
This query would first sort users by their name in ascending order, and then sort users with the same name by their created_at column in descending order.
How to insert a new record in a Laravel query?
To insert a new record in a Laravel query, you can use the insert method on the model class or the query builder. Here is an example using the query builder:
DB::table('users')->insert([ 'name' => 'John Doe', 'email' => 'john.doe@example.com', 'password' => Hash::make('password123'), ]);
In this example, we are inserting a new record into the users table with the specified values for name, email, and password.
Alternatively, if you are using Eloquent models, you can create a new instance of the model and use the save method to insert the record into the database:
$user = new User; $user->name = 'John Doe'; $user->email = 'john.doe@example.com'; $user->password = Hash::make('password123'); $user->save();
This will create a new User model instance with the specified values and save it to the database.
How to use raw SQL in Laravel queries?
You can use raw SQL in Laravel queries by using the DB facade to make direct SQL queries to your database. Here's an example of how to use raw SQL in a Laravel query:
use Illuminate\Support\Facades\DB;
$users = DB::select('SELECT * FROM users WHERE age > ?', [18]);
foreach ($users as $user) { echo $user->name; }
In this example, we're using the select method of the DB facade to execute a raw SQL query that selects all users with an age greater than 18. The second parameter of the select method is an array of bindings that will be replaced in the query to prevent SQL injection.
It's important to be cautious when using raw SQL queries in your Laravel application to prevent SQL injection attacks. Always use parameter binding to sanitize user input and avoid directly inserting user input into your raw SQL queries.