entityframework.codeplex.com で推奨されているように、この問題をタグ付きで投稿していentity-frameworkます。
データベース: PostgreSQL 9.1 ドライバー: Npgsql 2.0.12
LINQ クエリ:
var q1 = customerComplaints
.Where(x => x.ParentId == null)
.Except(customerComplaints
.Where(x => customerComplaints
.Any(c => (c.ParentId == x.Id))));
var q2 =
(from a in customerComplaints
join b in
(customerComplaints.Where(a => a.ParentId != null)
.GroupBy(a => a.ParentId)
.Select(b => new { ParentId = b.Key, CreatedDate = b.Max(t => t.CreatedDate) }))
on a.ParentId equals b.ParentId
where a.CreatedDate == b.CreatedDate
select a);
q1 = q1.Union(q2);
// Apply Sorting
if (string.IsNullOrEmpty(sorting) || sorting.Equals("CustomerName ASC")) {
q1 = q1.OrderBy(p => p.Customer.Name);
} else if (sorting.Equals("CustomerName DESC")) {
q1 = q1.OrderByDescending(p => p.Customer.Name);
} else if (sorting.Equals("ManagerName ASC")) {
q1 = q1.OrderBy(p => p.Manager.LastName);
} else if (sorting.Equals("ManagerName DESC")) {
q1 = q1.OrderByDescending(p => p.Manager.LastName);
} else if (sorting.Equals("AssignedName ASC")) {
q1 = q1.OrderBy(p => p.Assigned.LastName);
} else if (sorting.Equals("AssignedName DESC")) {
q1 = q1.OrderByDescending(p => p.Assigned.LastName);
} else if (sorting.Equals("StatusName ASC")) {
q1 = q1.OrderBy(p => p.StatusId);
} else if (sorting.Equals("StatusName DESC")) {
q1 = q1.OrderByDescending(p => p.StatusId);
} else if (sorting.Equals("ComplaintType ASC")) {
q1 = q1.OrderBy(p => p.ComplaintTypeId);
} else if (sorting.Equals("ComplaintType DESC")) {
q1 = q1.OrderByDescending(p => p.ComplaintTypeId);
} else if (sorting.Equals("CreatedDate ASC")) {
q1 = q1.OrderBy(p => p.CreatedDate);
} else if (sorting.Equals("CreatedDate DESC")) {
q1 = q1.OrderByDescending(p => p.CreatedDate);
}
// Perform paging and execute query
var result = q1.Skip(startIndex).Take(pageSize).ToList();
結果の SQL
SELECT
"Limit1"."C1" AS "C1"
"Limit1"."C2" AS "C2"
"Limit1"."C3" AS "C3"
"Limit1"."C4" AS "C4"
"Limit1"."C5" AS "C5"
"Limit1"."C6" AS "C6"
"Limit1"."C7" AS "C7"
"Limit1"."C8" AS "C8"
"Limit1"."C9" AS "C9"
"Limit1"."C10" AS "C10"
"Limit1"."C11" AS "C11"
"Limit1"."C12" AS "C12"
"Limit1"."C13" AS "C13"
"Limit1"."C14" AS "C14"
"Limit1"."C15" AS "C15"
"Limit1"."C16" AS "C16"
"Limit1"."C17" AS "C17"
"Limit1"."C18" AS "C18"
"Limit1"."C19" AS "C19"
"Limit1"."C20" AS "C20"
"Limit1"."C21" AS "C21"
"Limit1"."C22" AS "C22"
FROM
(SELECT DISTINCT
"UnionAll1"."C1" AS "C1"
"UnionAll1"."C2" AS "C2"
"UnionAll1"."C3" AS "C3"
"UnionAll1"."C4" AS "C4"
"UnionAll1"."C5" AS "C5"
"UnionAll1"."C6" AS "C6"
"UnionAll1"."C7" AS "C7"
"UnionAll1"."C8" AS "C8"
"UnionAll1"."C9" AS "C9"
"UnionAll1"."C10" AS "C10"
"UnionAll1"."C11" AS "C11"
"UnionAll1"."C12" AS "C12"
"UnionAll1"."C13" AS "C13"
"UnionAll1"."C14" AS "C14"
"UnionAll1"."C15" AS "C15"
"UnionAll1"."C16" AS "C16"
"UnionAll1"."C17" AS "C17"
"UnionAll1"."C18" AS "C18"
"UnionAll1"."C19" AS "C19"
"UnionAll1"."C20" AS "C20"
"UnionAll1"."C21" AS "C21"
"UnionAll1"."C22" AS "C22"
FROM
(SELECT
"Except1"."Id" AS "C1"
"Except1"."ManagerId" AS "C2"
"Except1"."AssignedId" AS "C3"
"Except1"."ComplaintTypeId" AS "C4"
"Except1"."RootCauseId" AS "C5"
"Except1"."StatusId" AS "C6"
"Except1"."ResultingFromId" AS "C7"
"Except1"."RespParty" AS "C8"
"Except1"."Condition" AS "C9"
"Except1"."Containment" AS "C10"
"Except1"."CorrectiveAction" AS "C11"
"Except1"."ProductRejected" AS "C12"
"Except1"."IssueDate" AS "C13"
"Except1"."DueDate" AS "C14"
"Except1"."Approved" AS "C15"
"Except1"."ApprovedById" AS "C16"
"Except1"."ApprovedDate" AS "C17"
"Except1"."RejectionDetail" AS "C18"
"Except1"."Parent" AS "C19"
"Except1"."ParentId" AS "C20"
"Except1"."CreatedDate" AS "C21"
"Except1"."CreatedId" AS "C22"
FROM
(SELECT
"Extent1"."Id" AS "Id",
"Extent1"."ManagerId" AS "ManagerId",
"Extent1"."AssignedId" AS "AssignedId",
"Extent1"."ComplaintTypeId" AS "ComplaintTypeId",
"Extent1"."RootCauseId" AS "RootCauseId",
"Extent1"."StatusId" AS "StatusId",
"Extent1"."ResultingFromId" AS "ResultingFromId",
"Extent1"."RespParty" AS "RespParty",
"Extent1"."Condition" AS "Condition",
"Extent1"."Containment" AS "Containment",
"Extent1"."CorrectiveAction" AS "CorrectiveAction",
"Extent1"."ProductRejected" AS "ProductRejected",
"Extent1"."IssueDate" AS "IssueDate",
"Extent1"."DueDate" AS "DueDate",
"Extent1"."Approved" AS "Approved",
"Extent1"."ApprovedById" AS "ApprovedById",
"Extent1"."ApprovedDate" AS "ApprovedDate",
"Extent1"."RejectionDetail" AS "RejectionDetail",
"Extent1"."Parent" AS "Parent",
"Extent1"."ParentId" AS "ParentId",
"Extent1"."CreatedDate" AS "CreatedDate",
"Extent1"."CreatedId" AS "CreatedId"
FROM
"dbo"."CorrectiveActionRequest" AS "Extent1"
WHERE
"Extent1"."ParentId" IS NULL
EXCEPT
SELECT
"Extent2"."Id" AS "Id",
"Extent2"."ManagerId" AS "ManagerId",
"Extent2"."AssignedId" AS "AssignedId",
"Extent2"."ComplaintTypeId" AS "ComplaintTypeId",
"Extent2"."RootCauseId" AS "RootCauseId",
"Extent2"."StatusId" AS "StatusId",
"Extent2"."ResultingFromId" AS "ResultingFromId",
"Extent2"."RespParty" AS "RespParty",
"Extent2"."Condition" AS "Condition",
"Extent2"."Containment" AS "Containment",
"Extent2"."CorrectiveAction" AS "CorrectiveAction",
"Extent2"."ProductRejected" AS "ProductRejected",
"Extent2"."IssueDate" AS "IssueDate",
"Extent2"."DueDate" AS "DueDate",
"Extent2"."Approved" AS "Approved",
"Extent2"."ApprovedById" AS "ApprovedById",
"Extent2"."ApprovedDate" AS "ApprovedDate",
"Extent2"."RejectionDetail" AS "RejectionDetail",
"Extent2"."Parent" AS "Parent",
"Extent2"."ParentId" AS "ParentId",
"Extent2"."CreatedDate" AS "CreatedDate",
"Extent2"."CreatedId" AS "CreatedId"
FROM
"dbo"."CorrectiveActionRequest" AS "Extent2"
WHERE EXISTS
(SELECT
1 AS "C1"
FROM
"dbo"."CorrectiveActionRequest" AS "Extent3"
WHERE
"Extent3"."ParentId"="Extent2"."Id")) AS "Except1"
UNION ALL
SELECT
"Extent4"."Id" AS "Id",
"Extent4"."ManagerId" AS "ManagerId",
"Extent4"."AssignedId" AS "AssignedId",
"Extent4"."ComplaintTypeId" AS "ComplaintTypeId",
"Extent4"."RootCauseId" AS "RootCauseId",
"Extent4"."StatusId" AS "StatusId",
"Extent4"."ResultingFromId" AS "ResultingFromId",
"Extent4"."RespParty" AS "RespParty",
"Extent4"."Condition" AS "Condition",
"Extent4"."Containment" AS "Containment",
"Extent4"."CorrectiveAction" AS "CorrectiveAction",
"Extent4"."ProductRejected" AS "ProductRejected",
"Extent4"."IssueDate" AS "IssueDate",
"Extent4"."DueDate" AS "DueDate",
"Extent4"."Approved" AS "Approved",
"Extent4"."ApprovedById" AS "ApprovedById",
"Extent4"."ApprovedDate" AS "ApprovedDate",
"Extent4"."RejectionDetail" AS "RejectionDetail",
"Extent4"."Parent" AS "Parent",
"Extent4"."ParentId" AS "ParentId",
"Extent4"."CreatedDate" AS "CreatedDate",
"Extent4"."CreatedId" AS "CreatedId"
FROM
"dbo"."CorrectiveActionRequest" AS "Extent4"
INNER JOIN
(SELECT
"Extent5"."ParentId" AS "K1",
CAST
(max("Extent5"."CreatedDate") AS timestamp) AS "A1"
FROM
"dbo"."CorrectiveActionRequest" AS "Extent5"
WHERE
"Extent5"."ParentId" IS NOT NULL
GROUP BY
"Extent5"."ParentId") AS "GroupBy1"
ON
(("Extent4"."ParentId"="GroupBy1"."K1")
OR
(("Extent4"."ParentId" IS NULL )
AND
("GroupBy1"."K1" IS NULL )))
AND
("Extent4"."CreatedDate"="GroupBy1"."A1")) AS "UnionAll1") AS "Limit1"
ORDER BY "Distinct1"."C7" ASC
OFFSET 0
LIMIT 10
犯人は最後にいます：
("Extent4"."CreatedDate"="GroupBy1"."A1")) AS "UnionAll1") AS "Limit1"
ORDER BY "Distinct1"."C7" ASC
OFFSET 0
LIMIT 10
順序付けを試みDistinct1ますが、生成された SQL クエリのどこにもそのような識別子は存在しません。私はこれを数日間デバッグしようとしてきましたが、並べ替えの基準に依存していることに気付きました。たとえば、Customer.Name で並べ替えると、有効なクエリが生成されます。CreatedDate による並べ替えはできません。