TSQLExporter

From Free Pascal wiki
Jump to navigationJump to search
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.

TSQLExporter tsqlexporter.png 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.

In the example below a a TSynEdit is filled with exported contents of table mytable.

type
  myForm = class(TForm)
    btnExport: TButton;
    myConnector: TSQLConnector;
    myExporter: TSQLExporter;
    myQuery: TSQLQuery;
    myTransaction: TSQLTransaction;
    myScriptText: TSynEdit;
    mySyntax: TSynSQLSyn;
    procedure btnExportClick(Sender: TObject);
  private
    procedure ExportTable( const tblnam: String );
  end;

implementation


procedure myForm.btnExportClick(Sender: TObject);
begin
  ExportTable( 'mytable' );
end;


procedure myForm.ExportTable( const tblnam: string );
var
  ts: TStringStream;
begin
  try
    ts := TStringStream.Create( '' );
    myTransaction.Database := myConnector;
    myQuery.Database := myConnector;
    myExporter.DataSet := myQuery;

    myQuery.SQL.Text := 'SELECT * FROM ' + tblnam;
    myQuery.Open();

    with myExporter.FormatSettings do begin
      TableName :=      tblnam;                 // exporter uses tablename in insert statements
      DateFormat :=     'YYYY-MM-DD';           // SQL date format
      DateTimeFormat := 'YYYY-MM-DD hh:mm:ss';  // 
    end;

    myExporter.ExportToStream( ts );
    myScriptText.Text := ts.DataString;  //show formatted script text

    myQuery.Close();
  finally
    ts.Free();
  end;
end;