View file phpBB3/config/default/container/services_db.yml

services:
    dbal.conn:
        class: phpbb\db\driver\factory
        arguments:
            - '@service_container'

    dbal.conn.driver:
        synthetic: true

# ----- DB Tools -----
    dbal.tools.factory:
        class: phpbb\db\tools\factory

    dbal.tools:
        class: phpbb\db\tools\tools_interface
        factory: ['@dbal.tools.factory', get]
        arguments:
            - '@dbal.conn.driver'

# ----- DB Extractor -----
    dbal.extractor.factory:
        class: phpbb\db\extractor\factory
        arguments:
            - '@dbal.conn.driver'
            - '@service_container'

    dbal.extractor:
        class: phpbb\db\extractor\extractor_interface
        factory: ['@dbal.extractor.factory', get]

# ----- DB Extractors for different drivers -----
# Service MUST NOT be shared for all the handlers to work correctly.
    dbal.extractor.extractors.mssql_extractor:
        class: phpbb\db\extractor\mssql_extractor
        shared: false
        arguments:
            - '%core.root_path%'
            - '@request'
            - '@dbal.conn.driver'

    dbal.extractor.extractors.mysql_extractor:
        class: phpbb\db\extractor\mysql_extractor
        shared: false
        arguments:
            - '%core.root_path%'
            - '@request'
            - '@dbal.conn.driver'

    dbal.extractor.extractors.oracle_extractor:
        class: phpbb\db\extractor\oracle_extractor
        shared: false
        arguments:
            - '%core.root_path%'
            - '@request'
            - '@dbal.conn.driver'

    dbal.extractor.extractors.postgres_extractor:
        class: phpbb\db\extractor\postgres_extractor
        shared: false
        arguments:
            - '%core.root_path%'
            - '@request'
            - '@dbal.conn.driver'

    dbal.extractor.extractors.sqlite3_extractor:
        class: phpbb\db\extractor\sqlite3_extractor
        shared: false
        arguments:
            - '%core.root_path%'
            - '@request'
            - '@dbal.conn.driver'