MariaDB的存储过程和函数

Posted 2020-11-17 FishParadise

创建存储过程

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 ;

查询存储过程

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

查询存储过程定义

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

修改存储过程

使用ALTER语句可以修改存储过程或函数的特性，只能修改特性，如果想修改过程体只能删除存储过程再重新创建。

ALTER {PROCEDURE|FUNCTION} sp_name [characteriss]

删除存储过程

DROP {PROCEDURE|FUNCTION} [IF EXISTS] sp_name

创建函数

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;