What database systems can OpenOffice Base connect to?
From Apache OpenOffice Wiki
What database systems can OpenOffice Base connect to?
In addition to the driver for embedded HSQLDB engine, Base also supports standard JDBC (https://en.wikipedia.org/wiki/JDBC_driver) or ODBC (http://en.wikipedia.org/wiki/ODBC_driver#Drivers) drivers, as well as native SDBC drivers written specifically for OpenOffice (see: PostgreSQL (https://www.openoffice.org/dba/drivers/postgresql/index.html), MySQL (https://extensions.openoffice.org/en/project/aoo-my-sdbc), etc.).
Some drivers provide read-only access to existing data stored in tabular-spreadsheets (.ods/.xls), delimited text files (.csv), or popular address-book formats. The bundled "dBase" driver provides full read-write access to flat-file "dBase" databases