NHibernate的QueryOver可扩展性 [英] NHibernate QueryOver extensibility

问题描述

是否有可能通过某种方式延长QueryOver API？我想补充的是FOL

Is it possible to extend QueryOver API by somehow? What I want to add is the fol

var criteria = QueryOver.Of<InternalAssessor>()
    .WhereRestrictionOn(x => x.Sector).HasAtLeastOneFlagSet((int)sector)

在哪里部门是位标志枚举。我们有这样的标准的ICriteria API，我可以做

Where sector is bit flag enum. We had such criterion for ICriteria API and I can do

.Where(BitwiseRestrictions.AtLeastOneFlagSet("Sector", (int)sector))

但想拥有这样做的强类型的方式。是否有延长的任何实例QueryOver？

But want to have strongly typed way of doing it. Are there any examples of extending QueryOver?

推荐答案

还有就是，pretty的简单的方法，如何采取 IQueryOver ，搜索它的底层标准的和追加的，请参见 https://gist.github.com/2304623

There is, pretty straightforward way, how to take IQueryOver, search its Underlying criteria and append one, see https://gist.github.com/2304623

public static IQueryOver<TRoot, TSubType> WhereBitwiseRestriction<TRoot, TSubType>(
  this IQueryOver<TRoot, TSubType> query
  , Expression<Func<TSubType, object>> expression
  , int number)
{
  var name = ExpressionProcessor.FindMemberExpression(expression.Body);
  query.UnderlyingCriteria.Add
  (
    BitwiseRestrictions.AtLeastOneFlagSet(name, number)
  );
  return query; 
}

和使用

var criteria = QueryOver.Of<InternalAssessor>()
    ...
    .WhereRestrictionOn(x => x.Name).IsLike(searchedName) // standard
    ...
    .WhereBitwiseRestriction(x => x.Sector, (int)sector) // custom
    ...

要完全满足您的要求，我们需要引入一些人在这方面的中间人对象，将举行参照查询和我们的 BitwiseRestrictions 。另一部分将立即执行，追加号键，返回查询。类似的是做 QueryOverRestrictionBuilder 在NHibernate的...但不是上述的工作和足够简单？的

To fulfil your request completely, we would need to introduce some man-in-the-middle object, which will hold reference to query and our BitwiseRestrictions. Another extension will immediately take it, append number and return query. Similar is doing the QueryOverRestrictionBuilder in NHibernate... but is not the above working and simple enough?

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