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By default, FlexRule Designer supports MSSQL. But if you want to use other databases such as MySQL, or PostgreSQL, it requires installing the relevant database extension.
Install the Preferred Database Extension
- From the Extension Manager, select Databases.

- The following databases are available as extensions and install your preferred database extension.

Access the Database
Using the Database node
- Drag and drop a database node.

- Click on the database and the Database Type is available under Properties.

- You can add the connections strings and queries to the database.

Using Expressions
Built-in database functions are available to access the database.
This article contains the available database functions.