Nhibernate中CreateSQLQuery用法实例：
涉及的表：
Cake{
Id ，
CakeName
。。。。
}
CakeSize{
CakeId，-为外键，对应Cake表的字段Id
Size
}
（其中ISession session = NHibernateHelper.GetCurrentSession();）
用法一（返回数值）：
ISQLQuery query = session.CreateSQLQuery("SELECT COUNT(Id) AS C FROM Cake").AddScalar("C", NHibernateUtil.Int32);
int c = Convert.ToInt32(query.UniqueResult());
或int c = query.UniqueResult<int>;//使用此方法发现sql执行了两次，故不推荐使用。
用法二（返回对象实体）：
ISQLQuery query = session.CreateSQLQuery("select * from cake c").AddEntity("CAKE.DataTransfer.Entities.Cake");
或ISQLQuery query = session.CreateSQLQuery("select * from cake c").AddEntity("c", "CAKE.DataTransfer.Entities.Cake");
或ISQLQuery query = session.CreateSQLQuery("select * from cake c").AddEntity(typeof(Cake));
或ISQLQuery query = session.CreateSQLQuery("select * from cake c").AddEntity("c", typeof(Cake));
或ISQLQuery query = session.CreateSQLQuery("select * from cake c").AddEntity("c", typeof(Cake), LockMode.Write);
IList<Cake> c = query.List<Cake>();
用法三（连表查询）：
ISQLQuery query = session.CreateSQLQuery("select cs.* from cake c join CakeSize cs on cs.CakeId=c.Id")
.AddEntity("cs", typeof(CakeSize));
IList<CakeSize> cs = query.List<CakeSize>();