MariaDB的存儲過程和函數

創建存儲過程

DELIMITER $$
DROP PROCEDURE IF EXISTS `sp_test1`;
CREATE PROCEDURE sp_test1(IN a int, IN b int, OUT sum int )
BEGIN
	DECLARE c int;
if a is null then set a = 0; 
       end if;  
   	 if b is null then set b = 0;
    	end if;
    set sum  = a + b;
END; $$
DELIMITER ;

查詢存儲過程

SHOW PROCEDURE | FUNCTION STATUS LIKE '%sp%';
SHOW PROCEDURE STATUS WHERE Db = 'testdb';

查詢存儲過程定義

SHOW CREATE PROCEDURE `usp_test1` \G;
SELECT * FROM information_schema.ROUTINES WHERE ROUTINE_SCHEMA='testdb' \G;

修改存儲過程

使用ALTER語句可以修改存儲過程或函數的特性，只能修改特性，如果想修改過程體只能刪除存儲過程再重新創建。

ALTER {PROCEDURE|FUNCTION} sp_name [characteriss]

刪除存儲過程

DROP {PROCEDURE|FUNCTION} [IF EXISTS] sp_name

創建函數

SET GLOBAL log_bin_trust_function_creators = 1;
DELIMITER $$
DROP FUNCTION IF EXISTS `ufn_test2`;
CREATE FUNCTION ufn_test2()
RETURNS VARCHAR(100)                 
BEGIN
RETURN(SELECT 1);
END $$
DELIMITER ;
SET GLOBAL log_bin_trust_function_creators = 0;