MySQL事务处理

 1 -- --------------------------------------------------------------------------------
 2 -- Routine DDL
 3 -- Note: comments before and after the routine body will not be stored by the server
 4 -- --------------------------------------------------------------------------------
 5 DELIMITER $$
 6 
 7 CREATE DEFINER=`hap_dev`@`%` PROCEDURE `cpm_project_delete`(p_project_id integer)
 8 BEGIN
 9 DECLARE v_employee_id INT;
10 DECLARE v_projects INT;
11 -- 遍历数据结束标志
12 DECLARE done INT DEFAULT 0;
13 -- 事务出错标记位
14 DECLARE MSG INT DEFAULT 0;
15 -- 游标
16 DECLARE cur CURSOR FOR SELECT employee_id FROM cpm_emp_registeration where project_id = p_project_id;
17 -- 将结束标志绑定到游标
18 DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
19 -- 将出错标志绑定
20 DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET MSG = 1;
21 -- 关闭事务自动提交
22 SET AUTOCOMMIT = 0;
23 -- 开启事务
24 START TRANSACTION;
25 -- 打开游标
26 OPEN cur;
27 read_loop:LOOP
28 -- 提取游标里的数据
29 FETCH cur INTO v_employee_id;
30 -- 声明结束的时候
31 IF done=1 or MSG=1 THEN
32 LEAVE read_loop;
33 END IF;
34 SELECT COUNT(project_id) into v_projects FROM cpm_emp_registeration WHERE employee_id = v_employee_id;
35 IF v_projects = 1 then
36 -- 根据员工id删除员工数据
37 DELETE FROM cpm_emp_registeration WHERE employee_id = v_employee_id;
38 DELETE FROM cpm_employees WHERE employee_id = v_employee_id;
39 DELETE FROM cpm_emp_certificates WHERE employee_id = v_employee_id;
40 ELSE 
41 DELETE FROM cpm_emp_registeration WHERE employee_id = v_employee_id and project_id = p_project_id;
42 END IF;
43 END LOOP;
44 -- 关闭游标
45 CLOSE cur;
46 -- 根据工程id删除工程数据
47 DELETE FROM cpm_projects WHERE project_id = p_project_id;
48 DELETE FROM cpm_projects_duty_companies WHERE project_id = p_project_id;
49 -- 判断事务是否一致通过，是则提交，否则回滚
50 IF MSG = 1 THEN ROLLBACK;
51 ELSE COMMIT;
52 END IF;
53 END