ALTER PROCEDURE

Default argument values
Restriction on altering used procedures

Available in: DSQL, ESQL

Default argument values

Added in: 2.0

Description: You can now provide default values for stored procedure arguments, allowing the caller to omit one or more items from the end of the argument list.

Syntax:

ALTER PROCEDURE procname (<inparam> [, <inparam> ...])
   ...

<inparam>  ::=  paramname datatype [{= | DEFAULT} value]
Important: If you give a parameter a default value, all parameters coming after it must also get default values.

Example:

alter procedure TestProc
  (a int, b int default 1007, s varchar(12) = '-')
  ...

Restriction on altering used procedures

Changed in: 2.0, 2.0.1

Description: In Firebird 2.0 only, a restriction is in place which prevents anyone from dropping, altering or recreating a trigger or stored procedure if it has been used since the database was opened. This restriction has been removed again in version 2.0.1. Still, performing these operations on a live database is potentially risky and should only be done with the utmost care.