NHibernate的QueryOver與限制

Question

我是NHibernate的新手，並嘗試使用QueryOver。我有以下NHibernate的查詢

var departments = session 
    .QueryOver<Department>() 
    .Where(Restrictions.On<Department>x=> x.Parent.Id).IsIn(new List<int> {100})) 
    .List().ToList(); 

我有一個價值傳遞到ISIN爲此，我要新建立一個列表（new List<int> {100}））。有沒有更乾淨的方式做到這一點？

Answer 1

你的語法是OK的，只有很少的改變或改進可以做到......在這裏，他們是：

IList<Department> departments; 
var parents = new List<int> {167}; 

// advantage of this "original" QueryOver is, that it can accept 
// more parent IDs.. not only one "100" as in our example 
// so if we neet children of 100,101,102 
// we can get more from this syntax: new List<int> {100, 101,102...}; 
departments = session 
    .QueryOver<Department>() 
    .Where(Restrictions.On<Department>(x=> x.Parent.Id) 
     .IsIn(parents)) 
    .List(); 

// this style is just a bit more straightforward 
// saving few chars of code, using 'WhereRestrictionOn' 
departments = session 
    .QueryOver<Department>() 
    .WhereRestrictionOn(x => x.Parent.Id).IsIn(parents) 
    .List(); 

// in case we do have the only one parent ID to search for 
// we do not have to use the IS IN 
departments = session 
    .QueryOver<Department>() 
    .Where(x => x.Parent.Id == 100) 
    .List(); 

查看更多：16.2. Simple Expressions