Mysql5.7并发插入死锁问题解决

CREATE TABLE `song_rank` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `songId` int(11) NOT NULL,
  `weight` int(11) NOT NULL DEFAULT '0',
  PRIMARY KEY (`id`),
  UNIQUE KEY `songId_idx` (`songId`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8

select @@tx_isolation;

select @@autocommit;
set autocommit=0;

## 事务一
# 第一步执行
begin;
insert into  song_rank(songId,weight) values(17,100) on duplicate key update  weight=weight+1;
# 第三步执行
insert into  song_rank(songId,weight) values(16,100) on duplicate key update  weight=weight+1;

## 事务二
# 第二步执行
begin;
insert into  song_rank(songId,weight) values(16,100) on duplicate key update  weight=weight+1;
# 第四步执行
insert into  song_rank(songId,weight) values(17,100) on duplicate key update  weight=weight+1;

# 事务一
# 第一步执行
begin;
insert into  song_rank(songId,weight) values(17,100) on duplicate key update  weight=weight+1;
# 第四步执行
rollback；

# 事务二
# 第二步执行
begin;
insert into  song_rank(songId,weight) values(17,100) on duplicate key update  weight=weight+1;

# 事务三
# 第三步执行
begin;
insert into  song_rank(songId,weight) values(17,100) on duplicate key update  weight=weight+1;
# 出现死锁