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ASCII драйвер для CSV-файлов
{
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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| Категория: ASCII и CSV | Добавил: Skinner (03.07.2008)
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