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IBX Change Log version (2.5-1 Build nnn) Tue, 6 Dec 2022 23:13:00 +0000 |
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IBX Change Log version (2.6-0 Build 13976) Thu, 22 Jun 2023 13:49:22 +0100 |
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NOTE: THIS VERSION RE-WRITES THE INTERNAL BUFFER MANAGER AND SHOULD BE CONSIDERED |
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AS BETA SOFTWARE. EVEN THOUGH IT HAS PASSED ALL REGRESSION TESTS, IT CANNOT |
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BE ASSUMED TO BE PRODUCTION READY UNTIL WIDER USE. PLEASE REPORT ANY |
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ISSUES TO support@mwasoftware.co.uk |
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1. Complete rewrite of internal buffer management in order to improve performance |
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and maintainability. Highlights: |
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* Extending the size of the buffer pool no longer has to copy the entire record |
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cache. Instead, a new extent is simply added to the buffer pool. |
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* A memory to memory copy of each display buffer now is avoided when scolling the |
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dataset. |
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* A separate set of buffers is now used for calculated fields. This avoids |
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having to keep copies of calculated field values in the buffer cache. |
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* Compact bitmaps are used to record null status and need to refresh in each |
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buffer. |
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* Display buffer type changed from PChar to TRecordBuffer in line with change of |
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buffer type in FCL-DB. |
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2. TIBUpdateSQL: changes to SQL text will close linked dataset if open. This is |
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to ensure same behaviour as TIBDataset, TIBTable and TIBStoredProcedure. |
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3. TField Provider Flags: pfRefreshOnInsert and pfRefreshOnUpdate are now supported. |
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If either or both of these flags are set at design time (using the fields editor) |
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then this forces a row refresh on respectively insert or update, or both, when the |
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corresponding field is not present in an SQL RETURNING clause. |
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4. TIBCustomDataset.FieldDefsFromQuery moved to a helper class (TFieldDefsMaker) in order to improve |
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maintainability and readability and to add identification of primary key fields. |
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5. TIBQuery, TIBDataset and TIBTable. Traditionally, IBX has implemented the Refresh method |
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as a refresh of the current row. However, this is different behaviour to that described |
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in the FPC documentation for TDataset.Refresh which is described as "refetches the data in |
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the dataset from the underlying database, and attempts to reposition the cursor on |
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the same record as it was". IBX now complies with the FPC definition of Refresh. |
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6. A progammatic Row Refresh should no longer be required. |
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Use Insert/Update... returning to refresh any fields that may change following an |
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insert or update i.e. Identify fields on Insert only, Computed By, Blob and array fields |
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on both. If there are any other fields (e.g. updated by triggers) set the appropriate ProviderFlag |
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for the field at Design Time to force a row refresh if not in the returning clause. |
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7. It should now be possible to insert a row into an empty unidirectional dataset. |
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8. New TIBQuery, TIBDataSet and TIBTable property: BufferChunksInFirstBlock (default 50). |
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This gives the number of buffers in the initial block for the buffer pool in |
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bi-directional datasets. BufferChunks (default 1000) gives the number of buffers |
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in subsequent buffer pool blocks. This avoids large and mostly unused memory allocations |
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for small datasets. |
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IBX Change Log version (2.5-1 Build 13927) Tue, 6 Dec 2022 23:13:00 +0000 |
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1. IBCustomDataset: avoid problem with additions to TFieldType by using a subset instead. |
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