我正在尝试加快经常使用的查询。使用 aCompiledQuery
似乎是答案。但是当我尝试编译版本时,编译版本和非编译版本在性能上没有区别。
有人可以告诉我为什么 usingQueries.FindTradeByTradeTagCompiled
不比 using 快Queries.FindTradeByTradeTag
吗?
static class Queries
{
// Pre-compiled query, as per http://msdn.microsoft.com/en-us/library/bb896297
private static readonly Func<MyEntities, int, IQueryable<Trade>> mCompiledFindTradeQuery =
CompiledQuery.Compile<MyEntities, int, IQueryable<Trade>>(
(entities, tag) => from trade in entities.TradeSet
where trade.trade_tag == tag
select trade);
public static Trade FindTradeByTradeTagCompiled(MyEntities entities, int tag)
{
IQueryable<Trade> tradeQuery = mCompiledFindTradeQuery(entities, tag);
return tradeQuery.FirstOrDefault();
}
public static Trade FindTradeByTradeTag(MyEntities entities, int tag)
{
IQueryable<Trade> tradeQuery = from trade in entities.TradeSet
where trade.trade_tag == tag
select trade;
return tradeQuery.FirstOrDefault();
}
}