Help Center/ GaussDB/ Developer Guide(Distributed_8.x)/ Stored Procedures/ Basic Statements/ Call Statements
Updated on 2024-08-20 GMT+08:00
View PDF
Share

Call Statements

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
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
 
-- Create a table.
gaussdb=# CREATE SCHEMA hr;
gaussdb=# SET CURRENT_SCHEMA = hr;
gaussdb=# CREATE TABLE staffs 
(
  section_id INTEGER, 
  salary INTEGER
);
gaussdb=# INSERT INTO staffs VALUES (30, 10);
gaussdb=# INSERT INTO staffs VALUES (30, 20);

-- Create the stored procedure proc_staffs.
gaussdb=# CREATE OR REPLACE PROCEDURE proc_staffs
(vIM
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 PROCEDURE
-- Create the stored procedure proc_return.
gaussdb=# CREATE OR REPLACE PROCEDURE proc_return
AS
v_num NUMBER(8,2);
v_sum INTEGER;
BEGIN
proc_staffs(30, v_sum, v_num);  --Call a statement.
dbe_output.print_line(v_sum||'#'||v_num);
RETURN;  --Return a statement.
END;
/
CREATE PROCEDURE
-- Invoke the stored procedure proc_return.
gaussdb=# CALL proc_return();
30#2.00
 proc_return 
-------------

(1 row)

-- Delete the stored procedure.
gaussdb=# DROP PROCEDURE proc_staffs;
gaussdb=# DROP PROCEDURE proc_return;

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

-- Call the function func_return.
gaussdb=# CALL func_return();
1
 func_return 
-------------

(1 row)

-- Drop the function.
gaussdb=# DROP FUNCTION func_return;

-- Clear the current database mode.
gaussdb=# DROP SCHEMA hr CASCADE;
Parent topic: Basic Statements