To use a database plugin, place it in the "Plugins" folder along side the REALbasic IDE.  You will need to restart the IDE for the plugin to load.

It is recommended to only install database plugins you are using rather than all of them. 

Some plugins may require external libraries to be installed and the IDE will not load these plugins.  Details as follows.

REAL SQL Server:
  Supported on all platforms.

MySQL:
  Supported on all platforms.

PostgreSQL:
  Supported on all platforms.

ODBC:
  Supported on all platforms.  Requires ODBC drivers.

Oracle:
  Supported on all platforms.  Requires OCI library.