我正在使用 JPA 与 Hibernate 和 Postgresql 开发一个应用程序。使用 Netbeans 向导，我从现有数据库创建了实体类。其中一个类的摘录如下:
@Entity
@Table(name = "ADM_TYPES")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "AdmTypes.findAll", query = "SELECT a FROM AdmTypes a"),
@NamedQuery(name = "AdmTypes.findByCType", query = "SELECT a FROM AdmTypes a WHERE a.cType = :cType"),
@NamedQuery(name = "AdmTypes.findByVlType", query = "SELECT a FROM AdmTypes a WHERE a.vlType = :vlType"),
@NamedQuery(name = "AdmTypes.findByDsType", query = "SELECT a FROM AdmTypes a WHERE a.dsType = :dsType"),
@NamedQuery(name = "AdmTypes.findByVlStatus", query = "SELECT a FROM AdmTypes a WHERE a.vlStatus = :vlStatus"),
@NamedQuery(name = "AdmTypes.findByCTypePrefix", query = "SELECT a FROM AdmTypes a WHERE a.cType like :cTypePrefix")})
public class AdmTypes implements Serializable {
在 EJB 中我有:
@Stateless
@LocalBean
public class ModelManagement {
@PersistenceContext
private EntityManager em;
public List<AdmTypes> listAdmTypesPrefix(String prefix){
TypedQuery<AdmTypes> query = em.createNamedQuery("AdmTypes.findByCTypePrefix", AdmTypes.class);
query.setParameter("cTypePrefix", "'%"+prefix+"%'");
return query.getResultList();
}
当我尝试执行 ModelManagement.listAdmTypesPrefix("APREFIX") 时，它会生成以下错误:
javax.ejb.EJBException
at com.sun.ejb.containers.BaseContainer.processSystemException(BaseContainer.java:5193)
at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:5091)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4879)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2039)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1990)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:222)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88)
at $Proxy192.listAdmTypesPrefix(Unknown Source)
at com.librethinking.simmodsys.ejb.__EJB31_Generated__ModelManagement__Intf____Bean__.listAdmTypesPrefix(Unknown Source)
at com.librethinking.MockServlet.processRequest(MockServlet.java:64)
at com.librethinking.MockServlet.doGet(MockServlet.java:94)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: ERROR: relation "adm_types" does not exist
Position: 136
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1367)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1295)
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:265)
at com.librethinking.simmodsys.ejb.ModelManagement.listAdmTypesPrefix(ModelManagement.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1052)
at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1124)
at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:5366)
at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:619)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:571)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doAround(SystemInterceptorProxy.java:162)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:144)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:861)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:370)
at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5338)
at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5326)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:214)
... 32 more
Caused by: org.hibernate.exception.SQLGrammarException: ERROR: relation "adm_types" does not exist
Position: 136
at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:122)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:129)
at org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler.java:81)
at $Proxy194.executeQuery(Unknown Source)
at org.hibernate.loader.Loader.getResultSet(Loader.java:1953)
at org.hibernate.loader.Loader.doQuery(Loader.java:829)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:289)
at org.hibernate.loader.Loader.doList(Loader.java:2438)
at org.hibernate.loader.Loader.doList(Loader.java:2424)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2254)
at org.hibernate.loader.Loader.list(Loader.java:2249)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:470)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:355)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:195)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1248)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:256)
... 55 more
Caused by: org.postgresql.util.PSQLException: ERROR: relation "adm_types" does not exist
Position: 136
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2101)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1834)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:255)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:510)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:386)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:271)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:122)
... 70 more
我知道 Postgres 有点讨厌大写的表名，但我如何才能将查询更改为指向“ADM_TYPES”而不是 AdmTypes？这不应该自动完成吗(毕竟我是从现有数据库创建实体类的)？代码有什么问题？
谢谢!
最佳答案
Postgres(用于，不确定是否较新)将表名转换为小写。这是首选的操作程序。如果您记录您的查询，您会看到 hibernate 可能会或可能不会引用您的表名(我猜它不是)。
Hibernate saving User model to Postgres
老实说，如果你在 Postgres 上运行，你真的应该正确配置 hibernate ，或者，正如我所看到的，规范化你的数据库，因为表不应该有命名空间冲突(从而消除问题)。
//来自文章...
@Entity
@Table(name="\"User\"")
public class User {
...
}
2012 年 7 月 31 日编辑:
必须按以下方式对表的字段进行此更改:
对于@Column，更改添加转义的列的名称:
@Column(name = "\"C_MODEL\"")
对于 @JoinColumn，更改列的名称并添加 `:
@JoinColumn(name = "`TP_MODEL`")
您必须在出现错误的列上手动执行此操作。
关于java - 使用 Hibernate (JPA) 查询 Postgresql 找不到表，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11595599/