query database name

Database: Getting Started
September 30, 2022 – 06:20 am
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The database configuration for your application is located at config/database.php. In this file you may define all of your database connections, as well as specify which connection should be used by default. Examples for most of the supported database systems are provided in this file.

By default, Laravel's sample environment configuration is ready to use with Laravel Homestead, which is a convenient virtual machine for doing Laravel development on your local machine. Of course, you are free to modify this configuration as needed for your local database.

SQLite Configuration

After creating a new SQLite database using a command such as touch database/database.sqlite, you can easily configure your environment variables to point to this newly created database by using the database's absolute path:

DB_CONNECTION=sqlite DB_DATABASE=/absolute/path/to/database.sqlite

SQL Server Configuration

Laravel supports SQL Server out of the box; however, you will need to add the connection configuration for the database to your config/database.php configuration file:

'sqlsrv' => [ 'driver' => 'sqlsrv', 'host' => env('DB_HOST', 'localhost'), 'database' => env('DB_DATABASE', 'forge'), 'username' => env('DB_USERNAME', 'forge'), 'password' => env('DB_PASSWORD', ''), 'charset' => 'utf8', 'prefix' => '', ],

Read & Write Connections

Sometimes you may wish to use one database connection for SELECT statements, and another for INSERT, UPDATE, and DELETE statements. Laravel makes this a breeze, and the proper connections will always be used whether you are using raw queries, the query builder, or the Eloquent ORM.

To see how read / write connections should be configured, let's look at this example:

'mysql' => [ 'read' => [ 'host' => '', ], 'write' => [ 'host' => '' ], 'driver' => 'mysql', 'database' => 'database', 'username' => 'root', 'password' => '', 'charset' => 'utf8mb4', 'collation' => 'utf8mb4_unicode_ci', 'prefix' => '', ],

Note that two keys have been added to the configuration array: read and write. Both of these keys have array values containing a single key: host. The rest of the database options for the read and write connections will be merged from the main mysql array.

You only need to place items in the read and write arrays if you wish to override the values from the main array. So, in this case, will be used as the host for the "read" connection, while will be used for the "write" connection. The database credentials, prefix, character set, and all other options in the main mysql array will be shared across both connections.

Using Multiple Database Connections

When using multiple connections, you may access each connection via the connection method on the DB facade. The name passed to the connection method should correspond to one of the connections listed in your config/database.php configuration file:

$users = DB::connection('foo')->select(...);

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Source: laravel.com
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