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Oracle® Database SQL Language Reference
11g Release 2 (11.2)

Part Number E17118-03
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CALL

Purpose

Use the CALL statement to execute a routine (a standalone procedure or function, or a procedure or function defined within a type or package) from within SQL.

Note:

The restrictions on user-defined function expressions specified in "Function Expressions" apply to the CALL statement as well.

See Also:

Oracle Database PL/SQL Language Reference for information on creating such routine

Prerequisites

You must have EXECUTE privilege on the standalone routine or on the type or package in which the routine is defined.

Syntax

call::=

Description of call.gif follows
Description of the illustration call.gif

routine_clause::=

Description of routine_clause.gif follows
Description of the illustration routine_clause.gif

object_access_expression::=

Description of object_access_expression.gif follows
Description of the illustration object_access_expression.gif

Semantics

You can execute a routine in two ways. You can issue a call to the routine itself by name, by using the routine_clause, or you can invoke a routine inside the type of an expression, by using an object_access_expression.

schema

Specify the schema in which the standalone routine, or the package or type containing the routine, resides. If you do not specify schema, then Oracle Database assumes the routine is in your own schema.

type or package

Specify the type or package in which the routine is defined.

routine_clause

Specify the name of the function or procedure being called, or a synonym that resolves to a function or procedure.

When you call a member function or procedure of a type, if the first argument (SELF) is a null IN OUT argument, then Oracle Database returns an error. If SELF is a null IN argument, then the database returns null. In both cases, the function or procedure is not invoked.

Restriction on Functions If the routine is a function, then the INTO clause is required.

@dblink

In a distributed database system, specify the name of the database containing the standalone routine, or the package or function containing the routine. If you omit dblink, then Oracle Database looks in your local database.

See Also:

"Calling a Procedure: Example" for an example of calling a routine directly

object_access_expression

If you have an expression of an object type, such as a type constructor or a bind variable, then you can use this form of expression to call a routine defined within the type. In this context, the object_access_expression is limited to method invocations.

See Also:

"Object Access Expressions" for syntax and semantics of this form of expression, and "Calling a Procedure Using an Expression of an Object Type: Example" for an example of calling a routine using an expression of an object type

argument

Specify one or more arguments to the routine, if the routine takes arguments. You can use positional, named, or mixed notation for argument. For example, all of the following notations are correct:

CALL my_procedure(arg1 => 3, arg2 => 4) 
CALL my_procedure(3, 4) 

CALL my_procedure(3, arg2 => 4) 

Restrictions on Applying Arguments to Routines The argument is subject to the following restrictions:

INTO :host_variable

The INTO clause applies only to calls to functions. Specify which host variable will store the return value of the function.

:indicator_variable

Specify the value or condition of the host variable.

See Also:

Pro*C/C++ Programmer's Guide for more information on host variables and indicator variables

Example

Calling a Procedure: Example The following statement removes the Entertainment department (created in "Inserting Sequence Values: Example") using uses the remove_dept procedure. See Oracle Database PL/SQL Language Reference for the example that creates this procedure.

CALL emp_mgmt.remove_dept(162); 

Calling a Procedure Using an Expression of an Object Type: Example The following examples show how call a procedure by using an expression of an object type in the CALL statement. The example uses the warehouse_typ object type in the order entry sample schema OE:

ALTER TYPE warehouse_typ
      ADD MEMBER FUNCTION ret_name
      RETURN VARCHAR2
      CASCADE;

CREATE OR REPLACE TYPE BODY warehouse_typ
      AS MEMBER FUNCTION ret_name
      RETURN VARCHAR2
      IS
         BEGIN
            RETURN self.warehouse_name;
         END;
      END;
/
VARIABLE x VARCHAR2(25);

CALL warehouse_typ(456, 'Warehouse 456', 2236).ret_name()
   INTO :x;

PRINT x;
X
--------------------------------
Warehouse 456

The next example shows how to use an external function to achieve the same thing:

CREATE OR REPLACE FUNCTION ret_warehouse_typ(x warehouse_typ) 
  RETURN warehouse_typ
  IS
    BEGIN
      RETURN x;
    END;
/
CALL ret_warehouse_typ(warehouse_typ(234, 'Warehouse 234',
   2235)).ret_name()
   INTO :x;

PRINT x;

X
--------------------------------
Warehouse 234