(CVAL('DATABASE'))
Returns a text string containing the current connected database or NULL if the user is not connected to a database. This can be used to ensure that the user is connected before trying to execute some code. The example below shows how this might work.
SET VAR vDB = (CVAL('DATABASE'))
IF vDB IS NULL THEN
CONNECT MyDB
ENDIF
SET VAR vDB = (CVAL('DATABASE'))
IF vDB IS NULL THEN
PAUSE 2 USING 'MyDB is currently unavailable'
ENDIF
The check is repeated to ensure that the attempt to connect to the database was successful before continuing with the command file.
