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POEntity Framework 4 difficult query with not mapped property
 

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  1. POEntity Framework 4 difficult query with not mapped property
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    <p>I am a newbie in <code>EF</code> and I think that sometimes it's easier to sacrifice the advantage of ORM. But I want to know if there is a way to execute this query using <code>EF4</code>.</p> <p>I have datawarehouse with fact table. Mapping looks like</p> <pre><code> public class GameResult { [Key] public int GameResultId { get; set; } public virtual Competition Competition { get; set; } public virtual CustomDate DateGame { get; set; } public virtual Contender ContenderFirst { get; set; } public virtual Contender ContenderSecond { get; set; } public virtual Location Location { get; set; } public int ScoreContenderFirst { get; set; } public int ScoreContenderSecond { get; set; } public int PrizeStock { get; set; } public int Budget { get; set; } [NotMapped] public int WinCount { get; set; } [NotMapped] public int FailCount { get; set; } [NotMapped] public int DeadHeatCount { get; set; } [NotMapped] public int CountGames { get; set; } } </code></pre> <p>And query on <code>sql</code></p> <pre><code>select Contenders.Name, sum((Case when (ScoreContenderFirst &gt; ScoreContenderSecond) then 1 else 0 end)) as wins, sum ((Case when (ScoreContenderFirst = ScoreContenderSecond) then 1 else 0 end)) as equals, sum((Case when (ScoreContenderFirst &lt; ScoreContenderSecond) then 1 else 0 end)) as fail, COUNT(GameResults.GameResultId)as countGames from GameResults inner join Contenders on GameResults.ContenderSecond_ContenderId = Contenders.ContenderId where GameResults.ContenderFirst_ContenderId = 42 group by Contenders.Name UNION select Contenders.Name, sum((Case when (ScoreContenderFirst &lt; ScoreContenderSecond) then 1 else 0 end)) as wins, sum ((Case when (ScoreContenderFirst = ScoreContenderSecond) then 1 else 0 end)) as equals, sum((Case when (ScoreContenderFirst &gt; ScoreContenderSecond) then 1 else 0 end)) as fail, COUNT(GameResults.GameResultId)as countGames from GameResults inner join Contenders on GameResults.ContenderFirst_ContenderId = Contenders.ContenderId where GameResults.ContenderSecond_ContenderId = 42 group by Contenders.Name </code></pre> <p>This <code>sql</code> query means (I want to get game results of a particular team versus other teams (number of games that the particular team is winner, and number of games where the particular team is looser) )</p>
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    1. COMaybe you could explain what your SQL request returns, i.e. what is its goal.
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    2. COWhy do you store aggregated results in each individual object and not in another specific results class that's not part of the EF model?
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      1. USGert Arnold
    3. CO@GertArnold I find two ways http://stackoverflow.com/questions/1987836/creating-a-non-mapped-property-in-an-entity-entity-framework and http://stackoverflow.com/questions/5155853/adding-additional-properties-to-an-entity-framework-4-code-first-ctp-5-entity. ANd decide why not save aggregate results as [Not Mapped] objects. Please, offer your solution
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