How Does Laravel Manage Multiple Database Connections?

Managing Multiple Databases in Laravel

Laravel offers robust capabilities for working with multiple databases in a single application. This flexibility allows developers to separate data sources logically and cater to diverse requirements.

Facade Method

Yes, Laravel provides the DB facade to facilitate the use of multiple database connections. Using the connection method on this facade, developers can seamlessly access each connection defined in the config/database.php configuration file.

Connection Definition

To define multiple database connections, follow the instructions below:

• Using Environment Variables:

  • Set DB_CONNECTION and DB_CONNECTION_[connection_name] environment variables along with their corresponding details.

• Using config/database.php:

  • Add an entry for each database connection in the 'connections' array with the appropriate database credentials.

• Without Environment Variables (Laravel <= 4.0):

  • Define connections in the 'connections' array within app/config/database.php.

Schema and Migration

To use specific connections for schema and migration operations, use the connection method on the Schema or Migration class. Alternatively, you can set the $connection variable within your model to use a specific connection.

Query Builder

Execute queries against specific connections using the DB::connection method, providing the desired connection name.

Model

To connect Eloquent models to a specific database, set the $connection variable within the model class.

Eloquent

In Eloquent ORM (Laravel <= 4.0), set the $connection variable within the model class to connect a model to a specific database.

Transaction Mode

Manage transactions across multiple databases by using the DB::transaction method. You can specify the connection for each operation within the transaction block.

Runtime Connection Customization

Customize database connections at runtime using the setConnection method (non-static) or the on static method within your models or controllers.

Note: Building relationships between tables across different databases requires caution due to potential caveats based on your database and settings. Refer to the provided documentation for further insights and recommended practices.

The above is the detailed content of How Does Laravel Manage Multiple Database Connections?. For more information, please follow other related articles on the PHP Chinese website!