Help Center/ GaussDB/ Developer Guide(Centralized_8.x)/ Stored Procedure/ Control Statements/ Branch Statements
Updated on 2024-08-20 GMT+08:00
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Branch Statements

Syntax

Figure 1 shows the syntax diagram for a branch statement.

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 be executed.

Examples

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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)

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