Nhibernate中CreateSQLQuery用法实例

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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>();