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javatwo
 Post subject: how to avoid duplicate constraints in mysql table
PostPosted: Sat Sep 18, 2010 9:55 pm 
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Joined: Tue Sep 13, 2005 2:01 am
Posts: 137
Hi, we are using Mysql 5.x and JBoss 5.1.0.

We stop/start JBoss often, and found duplicate constraints, for example,

mysql> show create table Book

CONSTRAINT `FK61687183494D1F9` FOREIGN KEY (`userId`) REFERENCES `user` (`id`),
CONSTRAINT `FK61687183494DD3C` FOREIGN KEY (`userId`) REFERENCES `user` (`id`),
CONSTRAINT `FK61687183494E0FD` FOREIGN KEY (`userId`) REFERENCES `user` (`id`),

This will harm mysql performance.

How to prevent Hibernate from generating duplicate constraints? Thanks.
Dave
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