(动态改变数据源遇到的问题)sqlserver2012：No Dialect mapping for JDBC type: -9解决方案

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());
 }
}