This built-in connector allows you to use the Bookshelf ORM using the strapi-connector-knex connector.
Bookshelf ORM is a JavaScript ORM for Node.js, built on the Knex node module SQL query builder. Featuring both promise based and traditional callback interfaces, providing transaction support, eager/nested-eager relation loading, polymorphic associations, and support for one-to-one, one-to-many, and many-to-many relations.
It is designed to work well with SQLite3, PostgreSQL, MySQL, MariaDB, Microsoft SQL Server and Oracle.