TDataSet: what changed
Revision 2 to 3. Removed lines have a minus sign; added lines have a plus sign.
Title: TDataset TDataSet
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| 1 | + | **TDataSet** is the main link to the actual data in a database. A TDataSet descendant acts like a cursor on a table or query-result. | |
| 2 | + | ||
| 3 | + | ``` pascal | |
| 4 | + | SQLTransaction1.Database := SQLConnection1; | |
| 5 | + | SQLQuery1.Transaction := SQLTransaction1; | |
| 6 | + | DataSource1.DataSet := SQLQuery1; | |
| 7 | + | DBGrid1.DataSource := DataSource1; | |
| 8 | + | ``` | |
| 9 | + | ||
| 10 | + | A dataset (for example a query result) can be edited: | |
| 11 | + | ||
| 12 | + | ``` pascal | |
| 13 | + | ds.Edit(); | |
| 14 | + | ds.FieldByName('NAME').AsString := 'Edited name'; | |
| 15 | + | ds.Post(); | |
| 16 | + | ds.UpdateMode := upWhereAll; | |
| 17 | + | ds.ApplyUpdates(); | |
| 18 | + | ``` | |
| 19 | + | ||
| 20 | + | ## Non-abstract descendants | |
| 21 | + | ||
| 22 | + | - [[TBufDataset]] - | |
| 23 | + | - [[TMemDataset]] - | |
| 24 | + | - [[TSdfDataSet]] - | |
| 25 | + | - [[TFixedFormatDataSet]] | |
| 26 | + | - [[TDbf]] - connect to dBase | |
| 27 | + | - [[TParadox]] - connect to Paradox/BDE (needs dlls, less features, read/write) | |
| 28 | + | - [[TParadoxDataSet]] - connect to Paradox/BDE (more features, read-only) | |
| 29 | + | - [[TFPCodeGenerator]] | |
| 30 | + | - [[TSQLQuery]] - connect to results of a SQL-query | |
| 31 | + | ||
| 32 | + | ## See also | |
| 33 | + | ||
| 34 | + | - [[doc:fcl/db/tdataset.html|TDataSet doc]] | |
| 35 | + | - [[TBufDataset]] | |
| 36 | + | - [[TMemDataset]] | |
| 37 | + | ||
| 38 | + | --- | |
| 39 | + | *From the Free Pascal wiki, page "TDataSet", as it stood on 2021-08-11 after a change by Arent, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's [[Licensing]] page. If you have concerns about this material, [message the admin](/wiki-contact).* |