TSQLExporter: what changed
Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.
Title: TSQLExporter
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| 1 | + | **TSQLExporter**  is a database export component for use with a [[TDataSet]]. It may be found on the Data Export tab of the [[Component Palette]] once you have installed the [[lazdbexport]] package. To export the contents of a TDataSet (for instance the result of a [[TSQLQuery]] correctly setup to link with a [[TSQLConnector]] and [[TSQLTransaction]]) also `FormatSettings.TableName` need be provided. | |
| 2 | + | ||
| 3 | + | In the example below a a [[TSynEdit]] is filled with exported contents of table `mytable`. | |
| 4 | + | ||
| 5 | + | ``` pascal | |
| 6 | + | type | |
| 7 | + | myForm = class(TForm) | |
| 8 | + | btnExport: TButton; | |
| 9 | + | myConnector: TSQLConnector; | |
| 10 | + | myExporter: TSQLExporter; | |
| 11 | + | myQuery: TSQLQuery; | |
| 12 | + | myTransaction: TSQLTransaction; | |
| 13 | + | myScriptText: TSynEdit; | |
| 14 | + | mySyntax: TSynSQLSyn; | |
| 15 | + | procedure btnExportClick(Sender: TObject); | |
| 16 | + | private | |
| 17 | + | procedure ExportTable( const tblnam: String ); | |
| 18 | + | end; | |
| 19 | + | ||
| 20 | + | implementation | |
| 21 | + | ||
| 22 | + | procedure myForm.btnExportClick(Sender: TObject); | |
| 23 | + | begin | |
| 24 | + | ExportTable( 'mytable' ); | |
| 25 | + | end; | |
| 26 | + | ||
| 27 | + | procedure myForm.ExportTable( const tblnam: string ); | |
| 28 | + | var | |
| 29 | + | ts: TStringStream; | |
| 30 | + | begin | |
| 31 | + | try | |
| 32 | + | ts := TStringStream.Create( '' ); | |
| 33 | + | myTransaction.Database := myConnector; | |
| 34 | + | myQuery.Database := myConnector; | |
| 35 | + | myExporter.DataSet := myQuery; | |
| 36 | + | ||
| 37 | + | myQuery.SQL.Text := 'SELECT * FROM ' + tblnam; | |
| 38 | + | myQuery.Open(); | |
| 39 | + | ||
| 40 | + | with myExporter.FormatSettings do begin | |
| 41 | + | TableName := tblnam; // exporter uses tablename in insert statements | |
| 42 | + | DateFormat := 'YYYY-MM-DD'; // SQL date format | |
| 43 | + | DateTimeFormat := 'YYYY-MM-DD hh:mm:ss'; // | |
| 44 | + | end; | |
| 45 | + | ||
| 46 | + | myExporter.ExportToStream( ts ); | |
| 47 | + | myScriptText.Text := ts.DataString; //show formatted script text | |
| 48 | + | ||
| 49 | + | myQuery.Close(); | |
| 50 | + | finally | |
| 51 | + | ts.Free(); | |
| 52 | + | end; | |
| 53 | + | end; | |
| 54 | + | ``` | |
| 55 | + | ||
| 56 | + | --- | |
| 57 | + | *From the Free Pascal wiki, page "TSQLExporter", as it stood on 2020-07-18 after a change by Trev, 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).* | |
| 58 | + | Category: Components | |
| 59 | + | Category: Databases | |
| 60 | + | Category: LCL | |
| 61 | + | Category: Lazarus |