com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '1' for

背景:用Eclipse+MySQL做项目的时候,从项目中保存数据

 

问题:

出现错误

org.springframework.transaction.TransactionSystemException:Could not commit JPA transaction;

nested exception isjavax.persistence.RollbackException: Exception [EclipseLink-4002]

(Eclipse Persistence Services -2.4.0.v20120608-r11652):

org.eclipse.persistence.exceptions.DatabaseException

Internal Exception:

com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException:

Duplicate entry '2' for key 'PRIMARY'

Error Code: 1062

 

关键信息:

1MySQLIntegrityConstraintViolationException是指外键出错了(我的问题是所改主键作为了其他表的外键)

2Duplicate entry '2'for key 'PRIMARY'是指主键重复了

 

解决办法:把数据库中那条主键为2的数据的主键改为其他值,再执行保存,就OK啦!

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