How to configure a database connection in Symfony?

@arnoldo.moen 

To configure a database connection in Symfony, you need to follow these steps:

1. Open the config/packages/doctrine.yaml file in your Symfony project.
2. Under the doctrine key, add a new key called dbal for database abstraction layer. Under this key, configure the parameters for your database connection. For example:

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doctrine:
    dbal:
        # configure these for your database
        driver: pdo_mysql
        host: '%env(DATABASE_HOST)%'
        port: '%env(DATABASE_PORT)%'
        dbname: '%env(DATABASE_NAME)%'
        user: '%env(DATABASE_USER)%'
        password: '%env(DATABASE_PASSWORD)%'

In the above example, we are using MySQL as the database driver, and the values for host, port, dbname, user, and password are being loaded from environment variables.

1. You can also configure additional options under the dbal key, such as the charset and server version. For example:

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doctrine:
    dbal:
        # configure these for your database
        driver: pdo_mysql
        host: '%env(DATABASE_HOST)%'
        port: '%env(DATABASE_PORT)%'
        dbname: '%env(DATABASE_NAME)%'
        user: '%env(DATABASE_USER)%'
        password: '%env(DATABASE_PASSWORD)%'
        charset: UTF8
        server_version: '5.7'

1. After you have configured your database connection, you can use Doctrine to interact with your database. For example, you can use Doctrine to query the database, create and update entities, and execute database migrations.

Note: Make sure to properly secure the sensitive database credentials like DATABASE_USER, DATABASE_PASSWORD, etc, by using environment variables or another secure mechanism like AWS Secrets Manager, etc.

@arnoldo.moen 

Additionally, if you want to configure multiple database connections or set up advanced database configurations, you can add a key called connections under the doctrine key in the doctrine.yaml file. For example:

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doctrine: dbal: default_connection: default connections: default: driver: pdo_mysql host: '%env(DATABASE_HOST)%' port: '%env(DATABASE_PORT)%' dbname: '%env(DATABASE_NAME)%' user: '%env(DATABASE_USER)%' password: '%env(DATABASE_PASSWORD)%' charset: UTF8 server_version: '5.7' secondary: driver: pdo_mysql host: '%env(SECONDARY_DATABASE_HOST)%' port: '%env(SECONDARY_DATABASE_PORT)%' dbname: '%env(SECONDARY_DATABASE_NAME)%' user: '%env(SECONDARY_DATABASE_USER)%' password: '%env(SECONDARY_DATABASE_PASSWORD)%' charset: UTF8 server_version: '5.6'

In the above example, we have defined two database connections: default and secondary. You can then use the EntityManager class to switch between these connections when performing database operations.