ALTER PROCEDURE

Function

ALTER PROCEDURE alters the attributes of a customized stored procedure.

Precautions

Only the owner of a stored procedure or a user granted with the ALTER permission can run the ALTER PROCEDURE command. The system administrator has this permission by default. The following is permission constraints depending on attributes to be modified:

• If a stored procedure involves operations on temporary tables, ALTER PROCEDURE cannot be used.
• To modify the owner or schema of a stored procedure, you must be the owner of the stored procedure or system administrator and a member of the new owner role.
• Only the system administrator and initial user can change the schema of a stored procedure to public.

Syntax

• Modify the additional parameters of a customized stored procedure.

  ALTER PROCEDURE procedure_name ( [ { [ argname ] [ argmode ] argtype} [, ...] ] )
      action [ ... ] [ RESTRICT ];
  

  The syntax of the action clause is as follows:

  {CALLED ON NULL INPUT  | STRICT}
   | {IMMUTABLE | STABLE | VOLATILE}
   | {SHIPPABLE | NOT SHIPPABLE}
   | {NOT FENCED | FENCED}
   | [ NOT ] LEAKPROOF
   | { [ EXTERNAL ] SECURITY INVOKER | [ EXTERNAL ] SECURITY DEFINER }
   | AUTHID { DEFINER | CURRENT_USER }
   | COST execution_cost
   | ROWS result_rows
   | SET configuration_parameter { { TO | = } { value | DEFAULT }| FROM CURRENT}
   | RESET {configuration_parameter | ALL}
   | COMMENT 'text'
  

• Modify the name of a customized stored procedure.

  ALTER PROCEDURE proname ( [ { [ argname ] [ argmode ] argtype} [, ...] ] )
      RENAME TO new_name;
  

• Modify the owner of a customized stored procedure.

  ALTER PROCEDURE proname ( [ { [ argname ] [ argmode ] argtype} [, ...] ] )
      OWNER TO new_owner;
  

• Modify the schema of a customized stored procedure.

  ALTER PROCEDURE proname ( [ { [ argname ] [ argmode ] argtype} [, ...] ] )
      SET SCHEMA new_schema;
  

Parameter Description

• procedure_name

  Specifies the name of the stored procedure to be modified.

  Value range: an existing stored procedure name

• argmode

  Specifies whether a parameter is an input or output parameter.

  Value range: IN, OUT, INOUT, and VARIADIC

• argname

  Specifies the parameter name.

  Value range: a string. It must comply with the identifier naming convention.

• argtype

  Specifies the type of the stored procedure parameter.

• CALLED ON NULL INPUT

  Declares that some parameters of the stored procedure can be called in normal mode if the parameter values are null. Omitting this parameter is the same as specifying it.

• IMMUTABLE

  Specifies that the stored procedure always returns the same result if the parameter values are the same.

• STABLE

  Specifies that the stored procedure cannot modify the database, and that within a single table scan it will consistently return the same result for the same parameter value, but its result varies by SQL statements.

• VOLATILE

  Specifies that the stored procedure value can change in a single table scan and no optimization is performed.

• LEAKPROOF

  Specifies that the stored procedure has no side effect and the parameter contains only the return value. LEAKPROOF can be set only by the system administrator.

• EXTERNAL

  (Optional) The purpose is to be compatible with SQL. This feature applies to all functions, not only external functions.

• SECURITY INVOKER

  AUTHID CURRENT_USER

  Specifies that the stored procedure will be executed with the permissions of the user who calls it. Omitting this parameter is the same as specifying it.

  SECURITY INVOKER and AUTHID CURRENT_USER have the same functions.

• SECURITY DEFINER

  AUTHID DEFINER

  Specifies that the stored procedure will be executed with the permissions of the user who created it.

  AUTHID DEFINER and SECURITY DEFINER have the same functions.

• COST execution_cost

  Estimates the execution cost of the stored procedure.

  The unit of execution_cost is cpu_operator_cost.

  Value range: a positive integer

• ROWS result_rows

  Estimates the number of rows returned by the stored procedure. This is only allowed when the stored procedure is declared to return a set.

  Value range: a positive number. The default value is 1000.

• configuration_parameter

  • value

    Sets a specified database session parameter to a specified value. If the value is DEFAULT or RESET, the default setting is used in the new session. OFF disables the setting.

    Value range: a string.

    • DEFAULT
    • OFF
    • RESET

    Specifies the default value.

  • from current

    Uses the value of configuration_parameter of the current session.

• new_name

  Specifies the new name of the stored procedure. To change the schema of a stored procedure, you must have the CREATE permission on the new schema.

  Value range: a string. It must comply with the identifier naming convention.

• new_owner

  Specifies the new owner of the stored procedure. To change the owner of a stored procedure, the new owner must have the CREATE permission on the schema to which the stored procedure belongs.

  Value range: an existing user role

• new_schema

  Specifies the new schema of the stored procedure.

  Value range: an existing schema

• COMMENT 'text'

  Comment a stored procedure.

Examples

See Examples in CREATE FUNCTION.

Helpful Links

CREATE PROCEDURE and DROP PROCEDURE