mysql-存储函数、存储过程

在测试数据的过程中，通过存储函数及存储过程构造数据：

# 生成随机字符串

DELIMITER $$

CREATE FUNCTION rand_string (n INT) RETURNS VARCHAR(255)

BEGIN

    DECLARE chars_str VARCHAR(100) DEFAULT 'abcdefghijklmnopqrstuvwsyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

    DECLARE return_str VARCHAR(255) DEFAULT '';

    DECLARE i INT DEFAULT 0;

    WHILE i < n DO

        SET return_str = CONCAT(return_str,SUBSTRING(chars_str FROM FLOOR(1+RAND()*52) FOR 1));

        SET i = i+1;

    END WHILE;

    RETURN return_str;

END $$

# 生成随机数

DELIMITER $$

CREATE  FUNCTION `rand_num`() RETURNS int(5)

BEGIN

    DECLARE i INT DEFAULT 0;

    set i = FLOOR(100+RAND()*10);

    RETURN i;

END $$

# 创建存储过程

## 生成dept的数据

DELIMITER $$

CREATE  PROCEDURE `insert_dept`(in start int(10), in max_num int(10))

BEGIN

    declare i int default 0;

    set autocommit = 0;

    repeat

    set i = i + 1;

    insert into dept (deptno, dname, loc) values ((start + i), rand_string(10), rand_string(8));

    until i = max_num

    end repeat;

    commit;

END $$

## 生成emp的数据

CREATE  PROCEDURE `insert_emp`(IN START INT(10), IN max_num INT(10))

BEGIN

    DECLARE i INT DEFAULT 0;

    SET autocommit = 0;

    REPEAT

        SET i = i + 1;

        INSERT INTO emp (empno, ename, job, mgr,hiredate, sal, comm, deptno) VALUES ((START+i), rand_string(6), 'salesman', 0001, CURDATE(), 2000,  400, rand_num());

        UNTIL i = max_num

    end REPEAT;

    COMMIT;

END

## 生成数据brief

delimiter $$

CREATE DEFINER = CURRENT_USER PROCEDURE `insert_brief`(in start bigint(20), in max_num bigint(20))

BEGIN

    declare i int default 0;

    set autocommit = 0;

    repeat

    set i = i + 1;

    insert into brief (`name`, `brief`, `address`) values (rand_string(5), rand_string(10), rand_string(8));

    until i = max_num

    end repeat;

    commit;

END $$

# 调用：

call insert_dept(1, 10);

# 删除函数与存储过程：

drop function/procedure insert_emp