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    <p>yesterday I was working on the similar problem. I had to select/load all parent-objects with exactly the given list of child-objects. I could solve this with the Criteria-API, with only one drawback (see *1 below).</p> <pre><code>public class Project { public virtual int ProjectId{get;set;} public virtual IList&lt;Part&gt; Parts{get;set;} ... } public class Part { public virtual int PartId{get;set;} public virtual Project Project{get;set;} // *1 this is the drawback: I need a public property for the ForegienKey from the child to the parent ... } </code></pre> <p>Here comes the Criteria:</p> <pre><code>DetachedCriteria top = DetachedCriteria.For&lt;Project&gt;(); foreach(Part part in searchedParts) { DetachedCriteria sub = DetachedCriteria.For&lt;Part&gt;(); sub.Add(Expresion.Eq("PartId",part.PartId)); sub.SetProjection("Project"); top.Add(Subqueries.PropertyIn("ProjectId",sub)); } </code></pre> <p>Back to your example: The SQL would look like this.</p> <pre><code>SELECT * FROM project WHERE projectid IN ( SELECT projectid FROM part WHERE partid = 1 /* @p0 */ ) AND projectid IN ( SELECT projectid FROM part WHERE partid = 2 /* @p1 */ ) </code></pre> <p>Basicaly I add for each child a subquery that checks for it's existance in the project and combine them with and, so only project with all that children will be selected.</p> <p>Greetings</p> <p>Juy Juka</p> <h1>Additional Uses</h1> <p>I wasn't finished with my code after this and if somone needs what I had to find out, I'll add it here. I hope the additional information belongs here, but I am not sure because it's my first post on stackoverflow.com</p> <p>For the following examples we need a more complex part-class:</p> <pre><code>public class Part { public virtual int PartId{get;set;} public virtual Project Project{get;set;} public virtual PartType PartType{get;set;} ... } public class PartType { public virtual int PartTypeId{get;set;} public virtual string Name{get;set;} ... } </code></pre> <p><strong>Different criterion on child-objects</strong></p> <p>It is possible to use the same code when you do not have the primarykey(s) of the searched parts, but would like to find the parts with other properties.</p> <pre><code>// I am asuming building-projects with houses, gardens, garages, driveways, etc. IEnumerable&lt;PartType&gt; searchedTypes = new PartType[]{housePart, gardenPart}; // could be a parameter or users choise or what ever DetachedCriteria top = DetachedCriteria.For&lt;Project&gt;(); foreach(PartType type in searchedTypes) { DetachedCriteria sub = DetachedCriteria.For&lt;Part&gt;(); sub.Add(Expresion.Eq("PartType",type)); // this is all that had to be changed. We could even use more complex operations with and, or, not, etc. sub.SetProjection("Project"); top.Add(Subqueries.PropertyIn("ProjectId",sub)); } </code></pre> <p>Expected SQL</p> <pre><code>SELECT * FROM project WHERE projectid IN ( SELECT projectid FROM part WHERE parttype = 1 /* @p0 // aka. housePart */ ) AND projectid IN ( SELECT projectid FROM part WHERE parttype = 2 /* @p1 // aka. gardenPart */ ) </code></pre> <p><strong>Excluding children</strong></p> <p>To negate this and search partens who do <em>not</em> have the searched children is easily done by using Subqueries.PropertyNotIn instead of Subqueries.PropertyIn.</p> <p><strong>Exactly/only the searched children</strong></p> <p>This was the tricky part I had to work on the longest time. I wanted parents with exactly the given list of parts. To stay with the building-project example: I am searching projects with a house-part and a guarden-part but no other parts</p> <pre><code>IEnumerable&lt;PartType&gt; searchedTypes = new PartType[]{housePart, gardenPart}; DetachedCriteria top = DetachedCriteria.For&lt;Project&gt;(); ICriterion notCriterion = null; foreach(PartType type in searchedTypes) { ICriterion subCriterion = Expresion.Eq("PartType",type); DetachedCriteria sub = DetachedCriteria.For&lt;Part&gt;(); sub.Add(subCriterion); sub.SetProjection("Project"); top.Add(Subqueries.PropertyIn("ProjectId",sub)); // I am collecting all valid criterions for child-objects and negate them subCriterion = Expresion.Not(subCriterion); notCriterion = notCriterion == null ? subCriterion:Expresion.And(notCriterion,subCriterion); } // with the negated criterions I exclude all parent-objects with an invalid child-object DetachedCriteria not = DetachedCriteria.For&lt;Part&gt;(); not.Add(notCriterion); sub.SetProjection("Project"); top.Add(Subqueries.PropertyNotIn("ProjectId",not)); </code></pre> <p>Expected SQL</p> <pre><code>SELECT * FROM project WHERE projectid IN ( SELECT projectid FROM part WHERE parttype = 1 /* @p0 // aka. housePart */ ) AND projectid IN ( SELECT projectid FROM part WHERE parttype = 2 /* @p1 // aka. gardenPart */ ) AND projectid NOT IN ( SELECT projectid FROM part WHERE NOT ( parttype = 1 /* @p2 // aka. housePart */ ) AND NOT ( parttype = 2 /* @p3 // aka. gardenPart */ ) ) </code></pre> <p>(More then one house and/or one guarden is possible, since no checkon "duplicated" entries is done)</p>
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