# The C++ SqlEngine Class

> The SqlEngine class implements functionality common to all SQL databases, whereas McoSqlEngine, McoMultithreadedSqlEngine, RemoteSqlEngine and SqlServer (specialized subclasses) manage the specific integration of SQL with eXtremeDB databases. These subclasses inherit all public methods from base class SqlEngine; the principle methods are listed in the McoSqlEngine page.

> ### For an overview see page C++ Classes