JPA SQL Server没有JDBC类型的Dialect映射：-9
我写了一个原生查询
Query query = entityManagerUtil.getEntityManager().createNativeQuery("SELECT c.NodeID,c.Code,c.Name FROM COM_Location c"); query.getResultList(); 但它对我不起作用….
我使用JPA，MSSQL Server 2008和Spring.It当我尝试用pojo类编写JPA查询但它无法执行本机查询时工作正常。
我在persistance.xml配置是这样的
任何人都建议我解决问题
我的堆栈跟踪说……
org.springframework.orm.jpa.JpaSystemException: org.hibernate.MappingException: No Dialect mapping for JDBC type: -9; nested exception is javax.persistence.PersistenceException: org.hibernate.MappingException: No Dialect mapping for JDBC type: -9 at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:311) at org.springframework.orm.jpa.aspectj.JpaExceptionTranslatorAspect.ajc$afterThrowing$org_springframework_orm_jpa_aspectj_JpaExceptionTranslatorAspect$1$18a1ac9(JpaExceptionTranslatorAspect.aj:15) at com.iconma.carz.daoimpl.SecurityDaoImpl.getAllLocations(SecurityDaoImpl.java:40) at com.iconma.carz.serviceimpl.SecurityServiceImpl.getAllLocations(SecurityServiceImpl.java:31) at com.iconma.carz.controllers.SecurityController.getLocations(SecurityController.java:51) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176) at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426) at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549) at javax.servlet.http.HttpServlet.service(HttpServlet.java:621) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:83) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) Caused by: javax.persistence.PersistenceException: org.hibernate.MappingException: No Dialect mapping for JDBC type: -9 at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1214) at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1147) at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:255) ... 37 more Caused by: org.hibernate.MappingException: No Dialect mapping for JDBC type: -9 at org.hibernate.dialect.TypeNames.get(TypeNames.java:77) at org.hibernate.dialect.TypeNames.get(TypeNames.java:100) at org.hibernate.dialect.Dialect.getHibernateTypeName(Dialect.java:375) at org.hibernate.loader.custom.CustomLoader$Metadata.getHibernateType(CustomLoader.java:590) at org.hibernate.loader.custom.CustomLoader$ScalarResultColumnProcessor.performDiscovery(CustomLoader.java:516) at org.hibernate.loader.custom.CustomLoader.autoDiscoverTypes(CustomLoader.java:532) at org.hibernate.loader.Loader.getResultSet(Loader.java:1962) at org.hibernate.loader.Loader.doQuery(Loader.java:802) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274) at org.hibernate.loader.Loader.doList(Loader.java:2533) at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2276) at org.hibernate.loader.Loader.list(Loader.java:2271) at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:316) at org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1842) at org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:165) at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:157) at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:246) ... 37 more
首先，您必须定义要使用的方言类名称：在hibernate.cfg.xml中添加您自己的类地址
com.nhl.dao.SQlServerDBDialect
然后在下面创建新类
package com.nhl.dao; import java.sql.Types; import org.hibernate.dialect.SQLServerDialect; import org.hibernate.type.StandardBasicTypes; public class SQlServerDBDialect extends SQLServerDialect { public SQlServerDBDialect() { super(); registerHibernateType(Types.NCHAR, StandardBasicTypes.CHARACTER.getName()); registerHibernateType(Types.NCHAR, 1, StandardBasicTypes.CHARACTER.getName()); registerHibernateType(Types.NCHAR, 255, StandardBasicTypes.STRING.getName()); registerHibernateType(Types.NVARCHAR, StandardBasicTypes.STRING.getName()); registerHibernateType(Types.LONGNVARCHAR, StandardBasicTypes.TEXT.getName()); registerHibernateType(Types.NCLOB, StandardBasicTypes.CLOB.getName()); } }
我有一个类似的问题，我的sql就是这个
Query nmspQuery = em.createNativeQuery("select aster from MyTable where my_column = 1001")
Oracle 11g中PRODUCT_NODE_ONIX_TYPE的数据类型是nvarachar2
我通过将值astr转换为to_char来修复它。 这很好用
Query nmspQuery = em.createNativeQuery("select TO_CHAR(aster) from MyTable where my_column = 1001")
类型-9是java.sql.Types.NVARCHAR 。 在https://github.com/hibernate/hibernate-orm/tree/master/hibernate-core/src/main/java/org/hibernate/dialect上查看SQLServerDialect变体的来源，没有nvarchar列的映射。
您可能想要尝试定义自己的方言，该方言还会注册各种NVARCHAR的定义：
public class SQLServer2008DialectWithNvarchar extends SQLServer2008Dialect { public SQLServer2008DialectWithNvarchar () { registerColumnType( Types.NCLOB, "nvarchar(MAX)" ); registerColumnType( Types.LONGNVARCHAR, "nvarchar(MAX)" ); registerColumnType( Types.NVARCHAR, "nvarchar(MAX)" ); registerColumnType( Types.NVARCHAR, 4000, "nvarchar($1)" ); } }
我基于SQLServer2005Dialect VARCHAR定义。 您可能需要将此类放在org.hibernate.dialect包中（或者至少我似乎记得存在问题，如果您不这样做）。
注意：我实际上没有测试过这个！
我也面临同样的问题，所以我做R＆D并得到解决方案，像Do一样显式演员（t2.name as varchar），它对我有用。
cast(t2.name as varchar)
检查此url。 http://www.coderanch.com/t/565413/ORM/databases/Dialect-mapping-JDBC-type
您必须扩展方言，并在构造函数中为N * JDBC类型注册适当的Hibernate类型：
public class MyDialect extends SomeOfTheProvidedDialects { public MyDialect() { registerHibernateType(Types.NCHAR, StandardBasicTypes.CHARACTER.getName()); registerHibernateType(Types.NCHAR, 1, StandardBasicTypes.CHARACTER.getName()); registerHibernateType(Types.NCHAR, 255, StandardBasicTypes.STRING.getName()); registerHibernateType(Types.NVARCHAR, StandardBasicTypes.STRING.getName()); registerHibernateType(Types.LONGNVARCHAR, StandardBasicTypes.TEXT.getName()); registerHibernateType(Types.NCLOB, StandardBasicTypes.CLOB.getName()); } }
经过测试，效果很好。
他们应该已经将这些添加到Hibernate源代码中（在org.hibernate.dialect.Dialect类中）…