Create executes queries to create database and user.

Delete executes queries to delete database and user.

New returns database interface according to engine type.

AdminCredentials contains admin username and password of database server.

Credentials contains credentials to connect database.

DatabaseAddress contains host and port of a database instance.

Mysql is a database interface, abstraced object represents a database on mysql instance can be used to execute query to mysql database.

Postgres is a database interface, abstraced object represents a database on postgres instance can be used to execute query to postgres database.

Database is interface for CRUD operate of different types of databases.