Help Center/ GaussDB/ Developer Guide(Distributed_V2.0-3.x)/ Stored Procedures/ Control Statements/ Branch Statements
Updated on 2025-08-19 GMT+08:00
View PDF

Branch Statements

Syntax

Figure 1 shows the syntax diagram for a return statement.

Figure 1 case_when::=

Figure 2 shows the syntax diagram for when_clause.

Figure 2 when_clause::=

Parameters:

  • case_expression: specifies the variable or expression.
  • when_expression: specifies the constant or conditional expression.
  • statement: specifies the statement to be executed.

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
 
gaussdb=# CREATE OR REPLACE PROCEDURE proc_case_branch(pi_result in integer, pi_return out integer)
AS 
    BEGIN 
        CASE pi_result 
            WHEN 1 THEN 
                pi_return := 111; 
            WHEN 2 THEN 
                pi_return := 222; 
            WHEN 3 THEN 
                pi_return := 333; 
            WHEN 6 THEN 
                pi_return := 444; 
            WHEN 7 THEN 
                pi_return := 555; 
            WHEN 8 THEN 
                pi_return := 666; 
            WHEN 9 THEN 
                pi_return := 777; 
            WHEN 10 THEN 
                pi_return := 888; 
            ELSE 
                pi_return := 999; 
        END CASE; 
        raise info 'pi_return : %',pi_return ; 
END; 
/
CREATE PROCEDURE

gaussdb=# CALL proc_case_branch(3,0);
INFO:  pi_return : 333
 pi_return 
-----------
       333
(1 row)

-- Drop the stored procedure.
gaussdb=# DROP PROCEDURE proc_case_branch;
DROP PROCEDURE
Parent topic: Control Statements