Question

我是JPA的新手。我正在使用Eclipse JDBC 2.5.2对Oracle数据库和Oracle JDBC驱动程序。对于下面的简单代码：

public List<DummyGrp> findByProperty(String propertyName, Object value) {
    CriteriaBuilder cb = entityManager.getCriteriaBuilder();
    CriteriaQuery<DummyGrp> cq = cb.createQuery(DummyGrp.class);
    Root<DummyGrp> rootQuery = cq.from(DummyGrp.class);
    cq.select(rootQuery);
    cq.where(cb.equal(rootQuery.get(propertyName),value));
    TypedQuery<DummyGrp> q = entityManager.createQuery(cq);
    return q.getResultList();

}

结果始终为空。打开调试后，我确实看到了SQL：

[EL Fine]：sql：2015-01-09 12：20：51.215 - ClientSession（559179052） - Connection（1008188683） - Thread（Thread [main，5，main]） - SELECT ID， DATA_TYPE_IND，ENTRY_TYPE_IND，GRP_DESC，GRP_NAME，TRANS_ORIG_MM，TRANS_ORIG_YR FROM DUMMY_GRP WHERE（GRP_NAME =？） bind =＆gt; [TG_dabfe8]

我调试了Oracle JDBC。我能够调试JDBC到我可以看到带有bind参数的客户端Oracle Statement，如果我直接从IDE运行语句，我可以得到结果。

如果我更改＆＃34;等于＆＃34;操作员＆＃34;喜欢＆＃34; （见下文）： cq.where（cb.like（rootQuery.get（propertyName的），值+＆＃34;％＆＃34））;

我得到了结果。

我相信我可能会遗漏一些简单的东西。谁能开导我？

提前致谢，

彼得C.

顺便提一下，这是Oracle JDBC Diagnositcs日志：

CONFIG：5E158F33 SQL：SELECT ID，DATA_TYPE_IND，ENTRY_TYPE_IND，GRP_DESC，GRP_NAME，TRANS_ORIG_MM，TRANS_ORIG_YR FROM DUMMY_GRP WHERE（GRP_NAME =？） java.lang.Throwable：没有错误 at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout（OracleStatement.java:1647） at oracle.jdbc.driver.OraclePreparedStatement.executeInternal（OraclePreparedStatement.java:4401） at oracle.jdbc.driver.OraclePreparedStatement.executeQuery（OraclePreparedStatement.java:4482） at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery（OraclePreparedStatementWrapper.java:6272）在org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeSelect（DatabaseAccessor.java:1007）在org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall（DatabaseAccessor.java:642）在org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall（DatabaseAccessor.java:558）在org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall（AbstractSession.java:2002）在org.eclipse.persistence.sessions.server.ClientSession.executeCall（ClientSession.java:298）在org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall（DatasourceCallQueryMechanism.java:242）在org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall（DatasourceCallQueryMechanism.java:228）在org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeSelectCall（DatasourceCallQueryMechanism.java:299）在org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.selectAllRows（DatasourceCallQueryMechanism.java:694）在org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRowsFromTable（ExpressionQueryMechanism.java:2738）在org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRows（ExpressionQueryMechanism.java:2691） at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery（ReadAllQuery.java:495） at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery（ObjectLevelReadQuery.java:1168）在org.eclipse.persistence.queries.DatabaseQuery.execute（DatabaseQuery.java:899） at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute（ObjectLevelReadQuery.java:1127）在org.eclipse.persistence.queries.ReadAllQuery.execute（ReadAllQuery.java:403） at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork（ObjectLevelReadQuery.java:1215） at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery（UnitOfWorkImpl.java:2896）在org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery（AbstractSession.java:1804） at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery（AbstractSession.java:1786）在org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery（AbstractSession.java:1751）在org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery（QueryImpl.java:258）在org.eclipse.persistence.internal.jpa.QueryImpl.getResultList（QueryImpl.java:469）在com.gaig.plentry.dao.DummyGroupDAOImpl.findByProperty（DummyGroupDAOImpl.java:47） at com.gaig.plentry.dao.DummyGroupDAOImpl.findByGroupName（DummyGroupDAOImpl.java:28）在com.gaig.plentry.dao.DummyGroupDAOImpl $$ FastClassBySpringCGLIB $$ 2d2bc23e.invoke（）在org.springframework.cglib.proxy.MethodProxy.invoke（MethodProxy.java:204）在org.springframework.aop.framework.CglibAopProxy $ CglibMethodInvocation.invokeJoinpoint（CglibAopProxy.java:717）在org.springframework.aop.framework.ReflectiveMethodInvocation.proceed（ReflectiveMethodInvocation.java:157） at org.springframework.transaction.interceptor.TransactionInterceptor $ 1.proceedWithInvocation（TransactionInterceptor.java:99） at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction（TransactionAspectSupport.java:267） at org.springframework.transaction.interceptor.TransactionInterceptor.invoke（TransactionInterceptor.java:96）在org.springframework.aop.framework.ReflectiveMethodInvocation.proceed（ReflectiveMethodInvocation.java:179）在org.springframework.aop.framework.CglibAopProxy $ DynamicAdvisedInterceptor.intercept（CglibAopProxy.java:653）

CriteriaBuilder等运算符不起作用

彼得C.

0 个答案: