采用代号3的积极记录,我实际上希望这样做:
select * from foo
left outer join bar on bar.Id = foo.barId
where foo.someProperty = 2
我写了一份储存程序,以收集数据,但分站只制造了从烟.和酒类中排的物体。
将数据退回到单一物体的最佳方式是什么,因此我只能对其加以约束。 理想的情况是,我想把它列入一个名单和编号;但没有写上我自己的类别,那么现在就看不出分位。
采用代号3的积极记录,我实际上希望这样做:
select * from foo
left outer join bar on bar.Id = foo.barId
where foo.someProperty = 2
我写了一份储存程序,以收集数据,但分站只制造了从烟.和酒类中排的物体。
将数据退回到单一物体的最佳方式是什么,因此我只能对其加以约束。 理想的情况是,我想把它列入一个名单和编号;但没有写上我自己的类别,那么现在就看不出分位。
这里有两种选择。
你可以形成一种数据库观点,使你加入,并且为您提供分站式数据,然后,你们的选择就象从任何其他表格中选择。
或者,如果你使用国邮局,你可以使用国邮局的表述方式加入匿名或动态类型(如果你使用国邮局)。 4) 例如:
public List<dynamic> LoadData(int id)
{
var data = from f in db.Foo
from b in db.Bar.Where(x => x.Id == f.BarId).DefaultIfEmpty()
where f.SomeProperty == id
select new
{
SomeProperty = f.Something,
AnotherProperty = b.SomethingElse
};
return data.Cast<dynamic>().ToList();
}
当然,另一种选择是采用上文提到的Linq语,但界定了你自己的类别以掌握所交数据并选择数据。
public class MyData
{
public string SomeProperty { get; set; }
public string AnotherProperty { get; set; }
}
public List<MyData> LoadData(int id)
{
var data = from f in db.Foo
from b in db.Bar.Where(x => x.Id == f.BarId).DefaultIfEmpty()
where f.SomeProperty == id
select new MyData()
{
SomeProperty = f.Something,
AnotherProperty = b.SomethingElse
};
return data.ToList();
}
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