警告: SQL Error: 1451, SQLState: 23000 二月 28, 2013 11:05:58 上午 org.hibernate.util.JDBCExceptionReporter logExceptions 严重: Cannot delete or update a parent row: a foreign key constraint fails (`myworkflow`.`jbpm4_execution`, CONSTRAINT `FK_EXEC_INSTANCE` FOREIGN KEY (`INSTANCE_`) REFERENCES `jbpm4_execution` (`DBID_`)) 二月 28, 2013 11:05:58 上午 org.hibernate.event.def.AbstractFlushingEventListener performExecutions 严重: Could not synchronize database state with session org.hibernate.exception.ConstraintViolationException: could not delete: [org.jbpm.pvm.internal.model.ExecutionImpl#10004] at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:94) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2569) at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2725) at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:97) at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:172) at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:365) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137) at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:656) at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754) at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723) at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:412) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:118) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:50) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) at $Proxy9.addHandleTask(Unknown Source)
分析原因:是jbpm表我有外键关联,不能删除,可是用sqlserver数据库就可以正常结束流程,为什么换成mysql数据库就不行了呢?经过思考发现,可能是配置mysql数据库的配置文件有问题,最后发现是配置的mysql的方言的问题。
解决方法:
我的mysql方言配置如下:
<prop key="hibernate.dialect">com.sense.workflow.util.ExtMySQL5Dialect </prop>
这里我专门写了一个类,为了解决字段hibernate和java映射的错误。而原先这个类的代码如下:
package com.sense.workflow.util; import java.sql.Types; import org.hibernate.Hibernate; import org.hibernate.dialect.MySQL5Dialect; /** * mysql注册类型映射 * @author Kevin12 * */ public class ExtMySQL5Dialect extends MySQL5Dialect{ public ExtMySQL5Dialect(){ super(); this.registerHibernateType(Types.LONGVARCHAR, Hibernate.STRING.getName()); } }
要将该类中继承的MySQL5Dialect改为MySQLInnoDBDialect即可,改后的代码如下:
package com.sense.workflow.util; import java.sql.Types; import org.hibernate.Hibernate; import org.hibernate.dialect.MySQLInnoDBDialect; /** * mysql注册类型映射 * @author Kevin12 * */ public class ExtMySQL5Dialect extends MySQLInnoDBDialect{ public ExtMySQL5Dialect(){ super(); this.registerHibernateType(Types.LONGVARCHAR, Hibernate.STRING.getName()); } }