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2011-09-07
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| 10:31 | Support LINQ queries with EndsWith method, fix for [59edc1018b]. Add test to verify the behavior from ticket [00f86f9739]. Modify test results/handling for ticket [8b7d179c3c] to be consistent with these new tests. check-in: 7810393e98 user: mistachkin tags: trunk | |
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2011-07-09
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| 09:03 | • Closed ticket [8b7d179c3c]: EF: wrong native query generation -> Data Loss, query omits some results plus 2 other changes artifact: 5c449d7cac user: mistachkin | |
| 09:01 | Fix for [8b7d179c3c], with tests. check-in: 76e929f694 user: mistachkin tags: trunk | |
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2011-07-08
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| 20:19 | • Pending ticket [8b7d179c3c]: EF: wrong native query generation -> Data Loss, query omits some results artifact: ad5c4b1619 user: mistachkin | |
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2011-07-07
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| 04:28 | • Ticket [8b7d179c3c]: 1 change artifact: 841d87d410 user: mistachkin | |
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2011-07-05
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| 07:50 | • Ticket [8b7d179c3c]: 3 changes artifact: f8e9aa182c user: mistachkin | |
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2011-05-10
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| 10:03 | • New ticket [8b7d179c3c]. artifact: 4ba12389bc user: anonymous | |
| Ticket Hash: | 8b7d179c3c535a15dc471a75ace400d959d1ec54 | |||
| Title: | EF: wrong native query generation -> Data Loss, query omits some results | |||
| Status: | Closed | Type: | Code_Defect | |
| Severity: | Critical | Priority: | Immediate | |
| Subsystem: | LINQ | Resolution: | Fixed | |
| Last Modified: | 2011-07-09 09:03:32 | |||
| Version Found In: | 1.0.72.0 | |||
| Description: | ||||
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var documents =
entities.Document
.OrderBy(p => p.Weight)
.Skip(pageSize*pageNumber)
.Take(pageSize);
This query will omit all records in page requested if record has the same Weight as records from previous pages. Example records. Page size 1. Page number 6 (zero-based). Columns: Id and Weight. 1 1 2 2 3 3 4 4 5 5 6 6 7 6 Last page (#6, zero-based) will return no elements. Detail: I use index over Weight column (Collate empty, ASC, AutoIncrement false). I don't think it has any effect. Explanation can be found in ToTraceString() returned by query. Query tries to find all records that should be skipped. Then it skips all records that have values (in fields used for OrderBy) the same as in those records that should be skip. It will work if Weight field always contains unique values. But will fail if values are not unique. Problem line (from listing below): WHERE ([Var_68].[Weight] = [Var_70].[Weight]) OR (([Var_68].[Weight] IS Full ToTraceString() result listing: SELECT [Var_68].[Id] AS [Id], [Var_68].[Weight] AS [Weight] FROM [Document] AS [Var_68] WHERE NOT (EXISTS (SELECT [Var_70].[Weight] AS [Weight] FROM ( SELECT [Extent1].[Weight] AS [Weight] FROM [Document] AS [Extent1] ORDER BY [Extent1].[Weight] ASC LIMIT 6 ) AS [Var_70] WHERE ([Var_68].[Weight] = [Var_70].[Weight]) OR (([Var_68].[Weight] IS NULL) AND ([Var_70].[Weight] IS NULL)))) ORDER BY [Var_68].[Weight] ASC LIMIT 1 It may be better to transform this EF query to something just simple: SELECT [Var_68].[Id] AS [Id], [Var_68].[Weight] AS [Weight] FROM [Document] AS [Var_68] ORDER BY [Var_68].[Weight] ASC LIMIT 1 OFFSET 6 Ivan Akcheurov. mistachkin added on 2011-07-09 09:03:32 UTC: | ||||