Help Center/ GaussDB(DWS)/ More Documents/ Developer Guide (ME-Abu Dhabi Region)/ Stored Procedures/ Basic Statements/ Call Statement
Updated on 2022-06-11 GMT+08:00
View PDF
Share

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

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
 
-- 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 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();
1

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