[variable = ] CALL procedure-name ( [ expression, ... ] )

[variable = ] CALL procedure-name ( [ parameter-name = expression, ... ] )

The CALL statement invokes a procedure that has been previously created with a CREATE PROCEDURE statement. When the procedure completes, any INOUT or OUT parameter value is copied back.

The argument list can be specified by position or by using keyword format. By position, the arguments match up with the corresponding parameter in the parameter list for the procedure (DEFAULT can be used for an optional parameter). By keyword, the arguments are matched up with the named parameters.

Procedure arguments can be assigned default values in the CREATE PROCEDURE statement, and missing parameters are assigned the default value. If no default is set, and an argument is not provided, an error is given.

Inside a procedure, a CALL statement can be used in a DECLARE statement when the procedure returns result sets.

Subqueries and spatial method calls are not allowed as arguments to a stored procedure in a CALL statement.

Procedures can return an integer value (for example, as a status indicator) using the RETURN statement. You can save this return value in a variable using the equality sign as an assignment operator:

If the procedure being called returns an INT and the value is NULL, then the error status value, 0, is returned instead. There is no way to differentiate between this case and the case of an actual value of 0 being returned.

DECLARE varname INT;
SET varname=test( );

You must be the owner of the procedure, or have one of the following privileges:

• EXECUTE privilege on the procedure
• EXECUTE ANY PROCEDURE system privilege

None.

• CREATE FUNCTION statement
• CREATE FUNCTION statement [External call]
• CREATE FUNCTION statement [Web service]
• CREATE PROCEDURE statement
• CREATE PROCEDURE statement [External call]
• CREATE PROCEDURE statement [Web service]
• EXECUTE statement [T-SQL]
• Result sets
• Stored procedures, triggers, batches, and user-defined functions

This example creates a procedure to return the number of orders placed by the customer whose ID is supplied, creates a variable to hold the result, calls the procedure, and displays the result.

CREATE PROCEDURE OrderCount (IN customer_ID INT, OUT Orders INT)
BEGIN
   SELECT COUNT(GROUPO.SalesOrders.ID)
   INTO Orders
   FROM GROUPO.Customers
   KEY LEFT OUTER JOIN SalesOrders
   WHERE Customers.ID = customer_ID;
END
go
 -- Create a variable to hold the result
CREATE VARIABLE Orders INT
go
-- Call the procedure, FOR customer 101
CALL OrderCount ( 101, Orders )
go
--  Display the result
SELECT Orders FROM DUMMY
go