frxadocomponents.pas

这个是功能强大的报表软件

function TfrxADODatabase.ToString: WideString;
begin
  Result := FDatabase.ConnectionString;
end;

procedure TfrxADODatabase.ADOBeforeConnect(Sende: TObject);
var
 Param: Boolean;
begin
  Param := True;
  BeforeConnect(Param);
end;

{ TfrxADOTable }

constructor TfrxADOTable.Create(AOwner: TComponent);
begin
  FTable := TADOTable.Create(nil);
  DataSet := FTable;
  SetDatabase(nil);
  inherited;
end;

constructor TfrxADOTable.DesignCreate(AOwner: TComponent; Flags: Word);
var
  i: Integer;
  l: TList;
begin
  inherited;
  l := Report.AllObjects;
  for i := 0 to l.Count - 1 do
    if TObject(l[i]) is TfrxADODatabase then
    begin
      SetDatabase(TfrxADODatabase(l[i]));
      break;
    end;
end;

class function TfrxADOTable.GetDescription: String;
begin
  Result := frxResources.Get('obADOTb');
end;

procedure TfrxADOTable.Notification(AComponent: TComponent; Operation: TOperation);
begin
  inherited;
  if (Operation = opRemove) and (AComponent = FDatabase) then
    SetDatabase(nil);
end;

procedure TfrxADOTable.SetDatabase(Value: TfrxADODatabase);
begin
  FDatabase := Value;
  if Value <> nil then
    FTable.Connection := Value.Database
  else if ADOComponents <> nil then
    FTable.Connection := ADOComponents.DefaultDatabase
  else
    FTable.Connection := nil;
  DBConnected := FTable.Connection <> nil;
end;

function TfrxADOTable.GetIndexFieldNames: String;
begin
  Result := FTable.IndexFieldNames;
end;

function TfrxADOTable.GetIndexName: String;
begin
  Result := FTable.IndexName;
end;

function TfrxADOTable.GetTableName: String;
begin
  Result := FTable.TableName;
end;

procedure TfrxADOTable.SetIndexFieldNames(const Value: String);
begin
  FTable.IndexFieldNames := Value;
end;

procedure TfrxADOTable.SetIndexName(const Value: String);
begin
  FTable.IndexName := Value;
end;

procedure TfrxADOTable.SetTableName(const Value: String);
begin
  FTable.TableName := Value;
end;

procedure TfrxADOTable.SetMaster(const Value: TDataSource);
begin
  FTable.MasterSource := Value;
end;

procedure TfrxADOTable.SetMasterFields(const Value: String);
begin
  FTable.MasterFields := Value;
end;

procedure TfrxADOTable.BeforeStartReport;
begin
  SetDatabase(FDatabase);
end;



{ TfrxADOQuery }

constructor TfrxADOQuery.Create(AOwner: TComponent);
begin
  FStrings := TStringList.Create;
  FQuery := TADOQuery.Create(nil);
{$IFDEF Delphi7}
  FQuery.LockType := ltReadOnly;
{$ENDIF}
  Dataset := FQuery;
  SetDatabase(nil);
  FLock := False;
  inherited;
end;

constructor TfrxADOQuery.DesignCreate(AOwner: TComponent; Flags: Word);
var
  i: Integer;
  l: TList;
begin
  inherited;
  l := Report.AllObjects;
  for i := 0 to l.Count - 1 do
    if TObject(l[i]) is TfrxADODatabase then
    begin
      SetDatabase(TfrxADODatabase(l[i]));
      break;
    end;
end;

destructor TfrxADOQuery.Destroy;
begin
  FStrings.Free;
  inherited;
end;

class function TfrxADOQuery.GetDescription: String;
begin
  Result := frxResources.Get('obADOQ');
end;

procedure TfrxADOQuery.Notification(AComponent: TComponent; Operation: TOperation);
begin
  inherited;
  if (Operation = opRemove) and (AComponent = FDatabase) then
    SetDatabase(nil);
end;

function TfrxADOQuery.GetSQL: TStrings;
begin
  FLock := True;
  FStrings.Assign(FQuery.SQL);
  FLock := False;
  Result := FStrings;
end;

procedure TfrxADOQuery.SetSQL(Value: TStrings);
begin
  FQuery.SQL.Assign(Value);
  FStrings.Assign(FQuery.SQL);
end;

procedure TfrxADOQuery.SetDatabase(Value: TfrxADODatabase);
begin
  FDatabase := Value;
  if Value <> nil then
    FQuery.Connection := Value.Database
  else if ADOComponents <> nil then
    FQuery.Connection := ADOComponents.DefaultDatabase
  else
    FQuery.Connection := nil;
  DBConnected := FQuery.Connection <> nil;
end;

procedure TfrxADOQuery.SetMaster(const Value: TDataSource);
begin
  FQuery.DataSource := Value;
end;

function TfrxADOQuery.GetCommandTimeout: Integer;
begin
  Result := THackQuery(FQuery).CommandTimeout;
end;

procedure TfrxADOQuery.SetCommandTimeout(const Value: Integer);
begin
  THackQuery(FQuery).CommandTimeout := Value;
end;

procedure TfrxADOQuery.UpdateParams;
begin
  frxParamsToTParameters(Self, FQuery.Parameters);
end;

procedure TfrxADOQuery.OnChangeSQL(Sender: TObject);
var
  i, ind: Integer;
  Param: TfrxParamItem;
  QParam: TParameter;
begin
  if not FLock then
  begin
    { needed to update parameters }
    FQuery.SQL.Text := '';
    FQuery.SQL.Assign(FStrings);
    inherited;

    { fill datatype automatically, if possible }
    for i := 0 to FQuery.Parameters.Count - 1 do
    begin
      QParam := FQuery.Parameters[i];
      ind := Params.IndexOf(QParam.Name);
      if ind <> -1 then
      begin
        Param := Params[ind];
        if (Param.DataType = ftUnknown) and (QParam.DataType <> ftUnknown) then
          Param.DataType := QParam.DataType;
      end;
    end;
  end;
end;

procedure TfrxADOQuery.BeforeStartReport;
begin
  SetDatabase(FDatabase);
  { needed to update parameters }
  SQL.Text := SQL.Text;
end;

{$IFDEF QBUILDER}
function TfrxADOQuery.QBEngine: TfqbEngine;
begin
  Result := TfrxEngineADO.Create(nil);
  TfrxEngineADO(Result).FQuery.Connection := FQuery.Connection;
end;
{$ENDIF}

{$IFDEF Delphi7}
function TfrxADOQuery.GetLockType: TADOLockType;
begin
  Result := FQuery.LockType;
end;

procedure TfrxADOQuery.SetLockType(const Value: TADOLockType);
begin
  FQuery.LockType := Value;
end;
{$ENDIF}



{$IFDEF QBUILDER}
constructor TfrxEngineADO.Create(AOwner: TComponent);
begin
  inherited;
  FQuery := TADOQuery.Create(Self);
end;

destructor TfrxEngineADO.Destroy;
begin
  FQuery.Free;
  inherited;
end;

procedure TfrxEngineADO.ReadFieldList(const ATableName: string;
  var AFieldList: TfqbFieldList);
var
  TempTable: TADOTable;
  Fields: TFieldDefs;
  i: Integer;
  tmpField: TfqbField;
begin
  AFieldList.Clear;
  TempTable := TADOTable.Create(Self);
  TempTable.Connection := FQuery.Connection;
  TempTable.TableName := ATableName;
  Fields := TempTable.FieldDefs;
  try
    try
      TempTable.Active := True;
      tmpField:= TfqbField(AFieldList.Add);
      tmpField.FieldName := '*';
      for i := 0 to Fields.Count - 1 do
      begin
        tmpField := TfqbField(AFieldList.Add);
        tmpField.FieldName := Fields.Items[i].Name;
        tmpField.FieldType := Ord(Fields.Items[i].DataType)
      end;
    except
    end;
  finally
    TempTable.Free;
  end;
end;

procedure TfrxEngineADO.ReadTableList(ATableList: TStrings);
begin
  ATableList.Clear;
  frxADOGetTableNames(FQuery.Connection, ATableList, ShowSystemTables);
//  FQuery.Connection.GetTableNames(ATableList, ShowSystemTables);
end;

function TfrxEngineADO.ResultDataSet: TDataSet;
begin
  Result := FQuery;
end;

procedure TfrxEngineADO.SetSQL(const Value: string);
begin
  FQuery.SQL.Text := Value;
end;
{$ENDIF}


initialization
  frxObjects.RegisterObject1(TfrxADODataBase, nil, '', {$IFDEF DB_CAT}'DATABASES'{$ELSE}''{$ENDIF}, 0, 51);
  frxObjects.RegisterObject1(TfrxADOTable, nil, '', {$IFDEF DB_CAT}'TABLES'{$ELSE}''{$ENDIF}, 0, 52);
  frxObjects.RegisterObject1(TfrxADOQuery, nil, '', {$IFDEF DB_CAT}'QUERIES'{$ELSE}''{$ENDIF}, 0, 53);



finalization
  frxObjects.UnRegister(TfrxADODataBase);
  frxObjects.UnRegister(TfrxADOTable);
  frxObjects.UnRegister(TfrxADOQuery);

end.