(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());

 }

}