Экспорт ADO таблиц в разные форматы

{ 
Exporting ADO tables into various formats 
 
In this article I want to present a component I built in order to 
supply exporting features to the ADOTable component. ADO supplies 
an extended SQL syntax that allows exporting of data into various  
formats. I took into consideration the following formats: 
 
1)Excel 
2)Html 
3)Paradox 
4)Dbase 
5)Text 
 
You can see all supported output formats in the registry: 
"HKEY_LOCAL_MACHINE\Software\Microsoft\Jet\4.0\ISAM formats" 
 
This is the complete source of my component } 
 
unit ExportADOTable; 
 
interface 
 
uses 
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, 
  Db, ADODB; 
 
type 
  TExportADOTable = class(TADOTable) 
  private 
    { Private declarations } 
    //TADOCommand component used to execute the SQL exporting commands 
    FADOCommand: TADOCommand; 
  protected 
    { Protected declarations } 
  public 
    { Public declarations } 
    constructor Create(AOwner: TComponent); override; 
 
    //Export procedures 
    //"FiledNames" is a comma separated list of the names of the fields you want to export 
    //"FileName" is the name of the output file (including the complete path) 
    //if the dataset is filtered (Filtered = true and Filter <> ''), then I append  
    //the filter string to the sql command in the "where" directive 
    //if the dataset is sorted (Sort <> '') then I append the sort string to the sql command in the  
    //"order by" directive 
 
    procedure ExportToExcel(FieldNames: string; FileName: string; 
      SheetName: string; IsamFormat: string); 
    procedure ExportToHtml(FieldNames: string; FileName: string); 
    procedure ExportToParadox(FieldNames: string; FileName: string; IsamFormat: string); 
    procedure ExportToDbase(FieldNames: string; FileName: string; IsamFormat: string); 
    procedure ExportToTxt(FieldNames: string; FileName: string); 
  published 
    { Published declarations } 
  end; 
 
procedure Register; 
 
implementation 
 
procedure Register; 
begin 
  RegisterComponents('Carlo Pasolini', [TExportADOTable]); 
end; 
 
constructor TExportADOTable.Create(AOwner: TComponent); 
begin 
  inherited; 
 
  FADOCommand := TADOCommand.Create(Self); 
end; 
 
 
procedure TExportADOTable.ExportToExcel(FieldNames: string; FileName: string; 
  SheetName: string; IsamFormat: string); 
begin 
  {IsamFormat values 
   Excel 3.0 
   Excel 4.0 
   Excel 5.0 
   Excel 8.0 
  } 
 
  if not Active then 
    Exit; 
  FADOCommand.Connection  := Connection;   
  FADOCommand.CommandText := 'Select ' + FieldNames + ' INTO ' + '[' + 
    SheetName + ']' + ' IN ' + '"' + FileName + '"' + '[' + IsamFormat + 
    ';]' + ' From ' + TableName; 
  if Filtered and (Filter <> '') then 
    FADOCommand.CommandText := FADOCommand.CommandText + ' where ' + Filter; 
  if (Sort <> '') then 
    FADOCommand.CommandText := FADOCommand.CommandText + ' order by ' + Sort; 
  FADOCommand.Execute; 
end; 
 
procedure TExportADOTable.ExportToHtml(FieldNames: string; FileName: string); 
var 
  IsamFormat: string; 
begin 
  if not Active then 
    Exit; 
 
  IsamFormat := 'HTML Export'; 
 
  FADOCommand.Connection  := Connection; 
  FADOCommand.CommandText := 'Select ' + FieldNames + ' INTO ' + '[' + 
    ExtractFileName(FileName) + ']' +  
    ' IN ' + '"' + ExtractFilePath(FileName) + '"' + '[' + IsamFormat + 
    ';]' + ' From ' + TableName; 
  if Filtered and (Filter <> '') then 
    FADOCommand.CommandText := FADOCommand.CommandText + ' where ' + Filter; 
  if (Sort <> '') then 
    FADOCommand.CommandText := FADOCommand.CommandText + ' order by ' + Sort; 
  FADOCommand.Execute; 
end; 
 
 
procedure TExportADOTable.ExportToParadox(FieldNames: string; 
  FileName: string; IsamFormat: string); 
begin 
  {IsamFormat values 
  Paradox 3.X 
  Paradox 4.X 
  Paradox 5.X 
  Paradox 7.X 
  } 
  if not Active then 
    Exit; 
 
  FADOCommand.Connection  := Connection; 
  FADOCommand.CommandText := 'Select ' + FieldNames + ' INTO ' + '[' + 
    ExtractFileName(FileName) + ']' +  
    ' IN ' + '"' + ExtractFilePath(FileName) + '"' + '[' + IsamFormat + 
    ';]' + ' From ' + TableName; 
  if Filtered and (Filter <> '') then 
    FADOCommand.CommandText := FADOCommand.CommandText + ' where ' + Filter; 
  if (Sort <> '') then 
    FADOCommand.CommandText := FADOCommand.CommandText + ' order by ' + Sort; 
  FADOCommand.Execute; 
end; 
 
procedure TExportADOTable.ExportToDbase(FieldNames: string; FileName: string; 
  IsamFormat: string); 
begin 
  {IsamFormat values 
  dBase III 
  dBase IV 
  dBase 5.0 
  } 
  if not Active then 
    Exit; 
 
  FADOCommand.Connection  := Connection; 
  FADOCommand.CommandText := 'Select ' + FieldNames + ' INTO ' + '[' + 
    ExtractFileName(FileName) + ']' +  
    ' IN ' + '"' + ExtractFilePath(FileName) + '"' + '[' + IsamFormat + 
    ';]' + ' From ' + TableName; 
  if Filtered and (Filter <> '') then 
    FADOCommand.CommandText := FADOCommand.CommandText + ' where ' + Filter; 
  if (Sort <> '') then 
    FADOCommand.CommandText := FADOCommand.CommandText + ' order by ' + Sort; 
  FADOCommand.Execute; 
end; 
 
procedure TExportADOTable.ExportToTxt(FieldNames: string; FileName: string); 
var 
  IsamFormat: string; 
begin 
  if not Active then 
    Exit; 
 
  IsamFormat := 'Text'; 
 
  FADOCommand.Connection  := Connection; 
  FADOCommand.CommandText := 'Select ' + FieldNames + ' INTO ' + '[' + 
    ExtractFileName(FileName) + ']' +  
    ' IN ' + '"' + ExtractFilePath(FileName) + '"' + '[' + IsamFormat + 
    ';]' + ' From ' + TableName; 
  if Filtered and (Filter <> '') then 
    FADOCommand.CommandText := FADOCommand.CommandText + ' where ' + Filter; 
  if (Sort <> '') then 
    FADOCommand.CommandText := FADOCommand.CommandText + ' order by ' + Sort; 
  FADOCommand.Execute; 
end; 
 
end. 
 
{ 
Note that you can use an already existing database as destination but not an already existing 
table in the database itself: if you specify an already exixting table you will receive 
an error message. You might insert a verification code inside every exporting procedure of my 
component, before the execution of the sql exporting command, in order to send a request of   
deleting the already present table or aborting the exporting process. 
 
carlo Pasolini, Riccione(italy), e-mail: ccpasolini@libero.it 
} 

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