JPA SQL Server没有JDBC类型的Dialect映射:-9

Question

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.

我的配置persistance.xml是这样的

<property name="hibernate.dialect" value="org.hibernate.dialect.SQLServerDialect"/>

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

Answer 1

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

<property name="hibernate.dialect">com.nhl.dao.SQlServerDBDialect</property>

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());

    }
}

Answer 2

类型-9是java.sql.Types.NVARCHAR.SQLServerDialect在https://github.com/hibernate/hibernate-orm/tree/master/hibernate-core/src/main/java/org/hibernate/dialect上查看变体的来源,没有nvarchar列的映射.

您可能想要尝试定义自己的方言,它也会注册各种NVARCHAR类似的定义:

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)" );
    }
}

我基于此的定义VARCHAR中SQLServer2005Dialect.您可能需要将此类放在org.hibernate.dialect包中(或者至少我似乎记得如果不这样做会有问题).

注意:我实际上没有测试过这个!

Answer 3

我也面临着同样的问题，所以我进行了研发，并得到了像cast（t2.name as varchar）这样的显式强制转换的解决方案，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