Firebird 2.1 Language Reference Update

DDL statements
PROCEDURE
A stored procedure (SP) is a code module that can be called by the client, by another stored procedure or by a
trigger. Stored procedures and triggers are written in Procedural SQL (PSQL). Most SQL statements are also
available in PSQL, sometimes with restrictions or extensions. Notable exceptions are DDL and transaction
control statements.
Stored procedures can accept and return multiple parameters.
CREATE PROCEDURE
Available in: DSQL, ESQL
Description: Creates a stored procedure.
Syntax:
CREATE PROCEDURE procname
[( [, ...])]
[RETURNS ( [, ...])]
AS
[]
BEGIN
[]
END
::= [{= | DEFAULT} value]
::=
::= paramname [NOT NULL] [COLLATE collation]
::= sql_datatype | [TYPE OF] domain
::= See PSQL::DECLARE for the exact syntax
/* If sql_datatype is a string type, it may include a character set */
Domains supported in parameter and variable declarations
Changed in: 2.1
Description: Firebird 2.1 and up support the use of domains instead of SQL datatypes when declaring input/output
parameters and local variables. With the “TYPE OF” modifier only the domain's type is used, not its NOT
NULL setting, CHECK constraint and/or default value.
Example:
create domain bool3
smallint
check (value is null or value in (0,1));
create domain bigposnum
bigint
check (value >= 0);
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