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Call Statement

Syntax

Figure 1 shows the syntax diagram for calling a clause.

Figure 1 call_clause::=

The above syntax diagram is explained as follows:

  • procedure_name specifies the name of a stored procedure.
  • parameter specifies the parameters for the stored procedure. You can set no parameter or multiple parameters.

Examples

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-- Create the stored procedure proc_staffs:
CREATE OR REPLACE PROCEDURE proc_staffs
(
section     NUMBER(6),
salary_sum out NUMBER(8,2),
staffs_count out INTEGER
)
IS
BEGIN
SELECT sum(salary), count(*) INTO salary_sum, staffs_count FROM hr.staffs where section_id = section;
END;
/

-- Create the stored procedure proc_return:
CREATE OR REPLACE PROCEDURE proc_return
AS
v_num NUMBER(8,2);
v_sum INTEGER;
BEGIN
proc_staffs(30, v_sum, v_num);  --Invoke a statement
dbms_output.put_line(v_sum||'#'||v_num);
RETURN;   --Return a statement
END;
/

-- Invoke a stored procedure proc_return:
CALL proc_return();

-- Delete a stored procedure:
DROP PROCEDURE proc_staffs;
DROP PROCEDURE proc_return;

--Create the function func_return.
CREATE OR REPLACE FUNCTION func_return returns void
language plpgsql
AS $$
DECLARE
v_num INTEGER := 1;
BEGIN
dbms_output.put_line(v_num);
RETURN;   --Return a statement
END $$;


-- Invoke the function func_return.
 CALL func_return();

-- Delete the function.
 DROP FUNCTION func_return;
Parent topic: Basic Statements