oracle No Dialect mapping for JDBC type-9錯誤

錯誤原因：使用的是Hibernate映射的數據庫方言，數據庫字段是NVARCHAR2()，NVARCHAR2()類型映射不到Java數據類型

Oracle10gDialect中沒有註冊NVARCHAR和NCLOB數據類型

一、重寫方言類  ，重新定義Oracle字段與Java類型的映射

package com.modules.sys.utils;

import java.sql.Types;

import org.hibernate.dialect.Oracle10gDialect;
import org.hibernate.type.StandardBasicTypes;

public class MyOracleDialect extends Oracle10gDialect
{
    public MyOracleDialect(){
        super();
        registerHibernateType(Types.CHAR, StandardBasicTypes.STRING.getName());
        registerHibernateType(Types.NVARCHAR, StandardBasicTypes.STRING.getName());
        registerHibernateType(Types.LONGNVARCHAR, StandardBasicTypes.STRING.getName());
        registerHibernateType(Types.DECIMAL, StandardBasicTypes.DOUBLE.getName());
        registerHibernateType(Types.NCLOB, StandardBasicTypes.STRING.getName());
    }
}

二、修改Hibernate配置文件  dialect指向自定義的方言類

<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> 
   <property name="dataSource" ref="dataSource"/>
   <property name="packagesToScan" value="com.greatmap"/>
   <property name="hibernateProperties">
      <props>
         <prop key="hibernate.dialect">com.modules.sys.utils.MyOracleDialect</prop>
         <prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</prop>
         <prop key="net.sf.ehcache.configurationResourceName">${hibernate.ehcache.configFile}</prop>
         <prop key="hibernate.cache.use_second_level_cache">false</prop>
         <prop key="hibernate.cache.use_query_cache">false</prop>
         <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
         <prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
         <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
      </props>
   </property>
</bean>