相关疑难解决方法(0)

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) …

我正在使用Hibernate的JPA-Implementation来访问我们的SQL Server 2012数据库.

当尝试nvarchar在本机查询中选择一个字段时,我得到一个异常"JDBC类型的无方言映射:-9".

它看起来很像JDBC类型的No Dialect映射:-9使用Hibernate 4和SQL Server 2012或JDBC类型的No Dialect映射:-9但是我找不到解决方案(两者都没有使用JPA).

我的数据库设置:

CREATE TABLE NvarcharExample(
    exampleField nvarchar(20) PRIMARY KEY
)

INSERT INTO NvarcharExample(exampleField) VALUES ('hello')

我的代码:

import java.io.IOException;
import javax.persistence.*;

@Entity
class NvarcharExample {

    @Id
    public String exampleField;
}

public class NvarcharTest {

    public static void main(String[] args) throws IOException, InterruptedException {

        String queryString = "SELECT e.exampleField FROM NvarcharExample e";

        // establish connection
        EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("persistenceUnit");
        try {
            EntityManager entityManager = entityManagerFactory.createEntityManager();

            // access …