static void test()
{
IdleBus <IFreeSql> ib = null; //单例注入
var fsql = ib.Get(); //获取当前租户对应的 IFreeSql
var fsql00102 = ib.ChangeTenant("00102").Get(); //切换租户，后面的操作都是针对 00102
var songRepository = ib.GetRepository <Song>();
var detailRepository = ib.GetRepository <Detail>();
}