No Dialect mapping for JDBC type: -9

由于项目中使用的是hibernate 4.35版本和sqlserver 2008数据库。所以，自定义方言时，需要和老版本做区别：

public class MySQLServerDialect extends SQLServerDialect {
 public MySQLServerDialect()
 {
     super();
     registerHibernateType(1, "string");
     registerHibernateType(-9, "string");
     registerHibernateType(-16, "string");
     registerHibernateType(3, "double");  

     registerHibernateType(Types.CHAR, StandardBasicTypes.STRING.getName());
     registerHibernateType(Types.NVARCHAR, StandardBasicTypes.STRING.getName());
     registerHibernateType(Types.LONGNVARCHAR, StandardBasicTypes.STRING.getName());
     registerHibernateType(Types.DECIMAL, StandardBasicTypes.DOUBLE.getName());
 }
}

然后注意修改hibernate 配置。本项目是将hibernate托管于spring,

  <property name="hibernateProperties">
  <props>
   <prop key="hibernate.show_sql">true</prop>
   <prop key="current_session_context_class">thread</prop>
  <!--   <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop> -->
  <prop key="hibernate.dialect">manage.myextends.sqlserver.MySQLServerDialect</prop> 

  </props>
  </property>