Firebird 2.1 Language Reference Update

Example:
DDL statements
create exception Ex_TooManyManagers
'Too many managers: An attempt was made to create more managers than the
maximum defined in the Limits table. If you really need to create more
managers than you have now, raise the limit first. However, please consult
your department''s manager before doing so. Otherwise, your decision may
be overturned later and the additional manager(s) removed.'
Note
The maximum exception message length depends on a certain system table field. Therefore, pre-2.0 databases
need to be backed up and restored under Firebird 2.x before they can store exception messages of up to 1021
bytes.
CREATE OR ALTER EXCEPTION
Available in: DSQL
Added in: 2.0
Description: If the exception does not yet exist, it is created just as if CREATE EXCEPTION were used. If it
already exists, it is altered. Existing dependencies are preserved.
Syntax: Exactly the same as for CREATE EXCEPTION.
RECREATE EXCEPTION
Available in: DSQL
Added in: 2.0
Description: Creates or recreates an exception. If an exception with the same name already exists, RECREATE
EXCEPTION will try to drop it and create a new exception. This wlll fail if there are existing dependencies on
the exception.
Syntax: Exactly the same as CREATE EXCEPTION.
Note
If you use RECREATE EXCEPTION on an exception that has dependent objects, you may not get an error
message until you try to commit your transaction.
DECLARE EXTERNAL FUNCTION
Available in: DSQL, ESQL
EXTERNAL FUNCTION
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