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java-mysql 死锁 Deadlock found when trying to get lock; try restarting transaction

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Jun 06, 2016 am 09:44 AM

mysqljava死锁sqltransaction

语言：java 数据库：mysql 5.0 数据引擎：innodb

项目中遇到一个mysql死锁的问题，报的异常如下：com.mysql.jdbc.exceptions.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction

我把问题简单化一下：

表t有id，a,b,c四个整型字段，id是primary key，a是unique key

5个Thread同时进行如下相同的5条sql操作，每个Thread这5条sql在同一个事物中：

insert into t（a，b,c） values(1，1，1) on duplicate key update b=b+VALUES(b)
insert into t（a，b,c） values(2，2，2) on duplicate key update b=b+VALUES(b)
insert into t（a，b,c） values(3，3，3) on duplicate key update b=b+VALUES(b)
insert into t（a，b,c） values(4，4，4) on duplicate key update b=b+VALUES(b)
insert into t（a，b,c） values(5，5，5) on duplicate key update b=b+VALUES(b)

这时执行就会报以上那个数据库异常。

查了些资料，大概了解是因为多个事物对同一条数据进行操作时，发生了锁的冲突。但是好的解决方案没有找到。

各位大神，帮忙看下，看有什么解决方案或思路，不胜感激！

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