Help Center/ GaussDB(DWS)/ Developer Guide/ Standard data warehouse (9.1.0.x)/ GaussDB(DWS) Stored Procedure/ GaussDB(DWS) Stored Procedure Control Statements/ Branch Statements
Updated on 2024-12-18 GMT+08:00
View PDF
Share

Branch Statements

Syntax

Figure 1 shows the syntax diagram.

Figure 1 case_when::=

Figure 2 shows the syntax diagram for when_clause.

Figure 2 when_clause::=

Parameter description:

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

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
 
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; 
/

CALL proc_case_branch(3,0);

-- Delete the stored procedure:
DROP PROCEDURE proc_case_branch;