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ALTER FUNCTION() SQL Commands ALTER FUNCTION()
NAME
ALTER FUNCTION - change the definition of a function
SYNOPSIS
ALTER FUNCTION name ( [ [ argmode ] [ argname ] argtype [, ...] ] )
action [ ... ] [ RESTRICT ]
ALTER FUNCTION name ( [ [ argmode ] [ argname ] argtype [, ...] ] )
RENAME TO new_name
ALTER FUNCTION name ( [ [ argmode ] [ argname ] argtype [, ...] ] )
OWNER TO new_owner
ALTER FUNCTION name ( [ [ argmode ] [ argname ] argtype [, ...] ] )
SET SCHEMA new_schema
where action is one of:
CALLED ON NULL INPUT | RETURNS NULL ON NULL INPUT | STRICT
IMMUTABLE | STABLE | VOLATILE
[ EXTERNAL ] SECURITY INVOKER | [ EXTERNAL ] SECURITY DEFINER
COST execution_cost
ROWS result_rows
SET configuration_parameter { TO | = } { value | DEFAULT }
SET configuration_parameter FROM CURRENT
RESET configuration_parameter
RESET ALL
DESCRIPTION
ALTER FUNCTION changes the definition of a function.
You must own the function to use ALTER FUNCTION. To change a function's schema,
you must also have CREATE privilege on the new schema. To alter the owner, you
must also be a direct or indirect member of the new owning role, and that role must
have CREATE privilege on the function's schema. (These restrictions enforce that
altering the owner doesn't do anything you couldn't do by dropping and recreating
the function. However, a superuser can alter ownership of any function anyway.)
PARAMETERS
name The name (optionally schema-qualified) of an existing function.
argmode
The mode of an argument: either IN, OUT, or INOUT. If omitted, the default
is IN. Note that ALTER FUNCTION does not actually pay any attention to OUT
arguments, since only the input arguments are needed to determine the func-
tion's identity. So it is sufficient to list the IN and INOUT arguments.
argname
The name of an argument. Note that ALTER FUNCTION does not actually pay any
attention to argument names, since only the argument data types are needed
to determine the function's identity.
argtype
The data type(s) of the function's arguments (optionally schema-qualified),
if any.
new_name
The new name of the function.
new_owner
The new owner of the function. Note that if the function is marked SECURITY
DEFINER, it will subsequently execute as the new owner.
new_schema
The new schema for the function.
CALLED ON NULL INPUT
RETURNS NULL ON NULL INPUT
STRICT CALLED ON NULL INPUT changes the function so that it will be invoked when
some or all of its arguments are null. RETURNS NULL ON NULL INPUT or STRICT
changes the function so that it is not invoked if any of its arguments are
null; instead, a null result is assumed automatically. See CREATE FUNCTION
[create_function(7)] for more information.
IMMUTABLE
STABLE
VOLATILE
Change the volatility of the function to the specified setting. See CREATE
FUNCTION [create_function(7)] for details.
[ EXTERNAL ] SECURITY INVOKER
[ EXTERNAL ] SECURITY DEFINER
Change whether the function is a security definer or not. The key word
EXTERNAL is ignored for SQL conformance. See CREATE FUNCTION [create_func-
tion(7)] for more information about this capability.
COST execution_cost
Change the estimated execution cost of the function. See CREATE FUNCTION
[create_function(7)] for more information.
ROWS result_rows
Change the estimated number of rows returned by a set-returning function.
See CREATE FUNCTION [create_function(7)] for more information.
configuration_parameter
value Add or change the assignment to be made to a configuration parameter when
the function is called. If value is DEFAULT or, equivalently, RESET is used,
the function-local setting is removed, so that the function executes with
the value present in its environment. Use RESET ALL to clear all function-
local settings. SET FROM CURRENT saves the session's current value of the
parameter as the value to be applied when the function is entered.
See SET [set(7)] and in the documentation for more information about allowed
parameter names and values.
RESTRICT
Ignored for conformance with the SQL standard.
EXAMPLES
To rename the function sqrt for type integer to square_root:
ALTER FUNCTION sqrt(integer) RENAME TO square_root;
To change the owner of the function sqrt for type integer to joe:
ALTER FUNCTION sqrt(integer) OWNER TO joe;
To change the schema of the function sqrt for type integer to maths:
ALTER FUNCTION sqrt(integer) SET SCHEMA maths;
To adjust the search path that is automatically set for a function:
ALTER FUNCTION check_password(text) SET search_path = admin, pg_temp;
To disable automatic setting of search_path for a function:
ALTER FUNCTION check_password(text) RESET search_path;
The function will now execute with whatever search path is used by its caller.
COMPATIBILITY
This statement is partially compatible with the ALTER FUNCTION statement in the SQL
standard. The standard allows more properties of a function to be modified, but
does not provide the ability to rename a function, make a function a security
definer, attach configuration parameter values to a function, or change the owner,
schema, or volatility of a function. The standard also requires the RESTRICT key
word, which is optional in PostgreSQL.
SEE ALSO
CREATE FUNCTION [create_function(7)], DROP FUNCTION [drop_function(l)]
SQL - Language Statements 2009-03-12 ALTER FUNCTION()
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On Apache/2.2.3 (Red Hat)
Under GNU General Public License
2009-12-23 21:00 @127.0.0.1 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)