如何调试 mysql 触发器 trigger
第一步，创建一张临时表 t (x,cc)
第二步，set global general_log=on；（立即生效，无需重启mysql）
----打开后 general_log后 mysql 会把触发器运行的每一步sql 语句写到 日志文件中 general_log_file
就可以根据日志输出结果来判断trigger 是哪一步异常没有执行下去；
####待调试的触发器如下
CREATE DEFINER=`root`@`%` TRIGGER `t_afterinsert_to_summary` AFTER INSERT ON `a` FOR EACH ROW
begin
declare v1 VARCHAR( 20 );
declare v2 VARCHAR( 20 );
declare done int default 0;
DECLARE mob VARCHAR ( 20 );
DECLARE content VARCHAR ( 500 );
DECLARE node_ip VARCHAR ( 20 );
DECLARE mobile_list CURSOR FOR SELECT mobile FROM c WHERE c.c = new.c1;
declare continue handler for not FOUND set done = 1; /*done = true;亦可*/
insert into t (x,cc) VALUES( new.c1, 'topfirest0');-------人为插入作业点
IF ( new.c1 = 0 ) THEN
insert into t (x,cc) VALUES( new.c1, 'firest1');-------人为插入作业点
select b into v1 from b where b.a=new.c1;
set v2=new.c1;
insert into t (x,cc) VALUES( new.c1, 'firest2');-------人为插入作业点
SET content = CONCAT( 'abcabcabc', '[', v2, ']', 'dede', v2,'ccddddd' );
insert into t (x,cc) VALUES( new.c1, 'firest3');-------人为插入作业点
insert into t (x,cc) VALUES( new.c1, 'firest4');-------人为插入作业点
OPEN mobile_list;-- 将游标中的值赋值给变量，要注意sql结果列的顺序
REPEAT
FETCH mobile_list INTO mob;-- while循环
if not done then
insert into t (x,cc) VALUES( new.c1, 'firest5');-------人为插入作业点
INSERT INTO t (x,cc) VALUES( v2, content);
end if;
-- 关闭游标
until done end repeat;
CLOSE mobile_list;
END IF;
end;
####
general_log_file | /root/sandboxes/msb_5_7_24/data/localhost.log 、
日志输出如下：
2018-02-10T00:05:35.803430Z 196 Query INSERT INTO `test`.`a`(`c1`, `c2`) VALUES ('0', '9999999')
2018-02-10T00:05:35.803682Z 196 Query insert into t (x,cc) VALUES( new.c1, 'topfirest0')
2018-02-10T00:05:35.803736Z 196 Query insert into t (x,cc) VALUES( new.c1, 'firest1')
2018-02-10T00:05:35.803768Z 196 Query select b into v1 from b where b.a=new.c1
2018-02-10T00:05:35.803832Z 196 Query insert into t (x,cc) VALUES( new.c1, 'firest2')
2018-02-10T00:05:35.803865Z 196 Query insert into t (x,cc) VALUES( new.c1, 'firest3')
2018-02-10T00:05:35.803884Z 196 Query insert into t (x,cc) VALUES( new.c1, 'firest4')
2018-02-10T00:05:35.803962Z 196 Query insert into t (x,cc) VALUES( new.c1, 'firest5')
2018-02-10T00:05:35.803989Z 196 Query INSERT INTO t (x,cc) VALUES( NAME_CONST('v2',_latin1'0' COLLATE 'latin1_swedish_ci'), NAME_CONST('content',_latin1'abcabcabc[0]dede0ccddddd' COLLATE 'latin1_swedish_ci'))
2018-02-10T00:05:35.804010Z 196 Query insert into t (x,cc) VALUES( new.c1, 'firest5')
2018-02-10T00:05:35.804066Z 196 Query INSERT INTO t (x,cc) VALUES( NAME_CONST('v2',_latin1'0' COLLATE 'latin1_swedish_ci'), NAME_CONST('content',_latin1'abcabcabc[0]dede0ccddddd' COLLATE 'latin1_swedish_ci'))
2018-02-10T00:05:35.804088Z 196 Query insert into t (x,cc) VALUES( new.c1, 'firest5')
2018-02-10T00:05:35.804105Z 196 Query INSERT INTO t (x,cc) VALUES( NAME_CONST('v2',_latin1'0' COLLATE 'latin1_swedish_ci'), NAME_CONST('content',_latin1'abcabcabc[0]dede0ccddddd' COLLATE 'latin1_swedish_ci'))
2018-02-10T00:05:35.804123Z 196 Query insert into t (x,cc) VALUES( new.c1, 'firest5')
2018-02-10T00:05:35.804138Z 196 Query INSERT INTO t (x,cc) VALUES( NAME_CONST('v2',_latin1'0' COLLATE 'latin1_swedish_ci'), NAME_CONST('content',_latin1'abcabcabc[0]dede0ccddddd' COLLATE 'latin1_swedish_ci'))
2018-02-10T00:05:35.804157Z 196 Query insert into t (x,cc) VALUES( new.c1, 'firest5')
2018-02-10T00:05:35.804173Z 196 Query INSERT INTO t (x,cc) VALUES( NAME_CONST('v2',_latin1'0' COLLATE 'latin1_swedish_ci'), NAME_CONST('content',_latin1'abcabcabc[0]dede0ccddddd' COLLATE 'latin1_swedish_ci'))
2018-02-10T00:05:35.804190Z 196 Query insert into t (x,cc) VALUES( new.c1, 'firest5')
2018-02-10T00:05:35.804206Z 196 Query INSERT INTO t (x,cc) VALUES( NAME_CONST('v2',_latin1'0' COLLATE 'latin1_swedish_ci'), NAME_CONST('content',_latin1'abcabcabc[0]dede0ccddddd' COLLATE 'latin1_swedish_ci'))
2018-02-10T00:05:35.804224Z 196 Query insert into t (x,cc) VALUES( new.c1, 'firest5')
2018-02-10T00:05:35.804239Z 196 Query INSERT INTO t (x,cc) VALUES( NAME_CONST('v2',_latin1'0' COLLATE 'latin1_swedish_ci'), NAME_CONST('content',_latin1'abcabcabc[0]dede0ccddddd' COLLATE 'latin1_swedish_ci'))
2018-02-10T00:05:35.804257Z 196 Query insert into t (x,cc) VALUES( new.c1, 'firest5')
2018-02-10T00:05:35.804273Z 196 Query INSERT INTO t (x,cc) VALUES( NAME_CONST('v2',_latin1'0' COLLATE 'latin1_swedish_ci'), NAME_CONST('content',_latin1'abcabcabc[0]dede0ccddddd' COLLATE 'latin1_swedish_ci'))