Ehlib,Dbgrideh ,zeoslib 排序 ,支持3其所有数据集

最新推荐文章于 2017-07-18 06:27:00 发布

dianxunzhang1095

最新推荐文章于 2017-07-18 06:27:00 发布

阅读量263

点赞数

原文链接：http://www.cnblogs.com/apple1/archive/2009/10/27/1590410.html

版权

原先版本只支持了 TZQuery ,用本地排序是不行的(默认没有支持zeoslib),所以只能按以下方法

Code
//**************************************
//
// Ehlib 的 dbgrideh 里面排序的函数
// 是对网上的 Ado 版本的修改
// 适用数据集 zeoslib 6.1 zquery
// delphi 7 ,windows xp
// 绵阳市卓易软件公司
//
//*********************

unit EhlibSortZeoslib;

interface
uses Controls, DB, ZAbstractRODataset, ZAbstractDataset, ZDataset, GridsEh,
  DBGridEh, forms, ZStoredProcedure;

procedure SortDBGridEh(Sender: TObject; ACol: Integer;
  Column: TColumnEh);

implementation

//由于ehlib不支持中文字段名，所以过滤掉

function IsChString(Str: string): Boolean;
var
  i: Integer;
begin
  Result := False;
  for i := 1 to Length(Str) do
  begin
    if Ord(Str[i]) > $7F then {if   Ord(Str[i])   >   127   then}
    begin
      Result := True;
      Break;
    end;
  end;
end;

procedure SortDBGridEh(Sender: TObject; ACol: Integer;
  Column: TColumnEh);
var
  FieldName, SortStr: string;
begin
  Screen.Cursor := crSQLWait;
  try
    if (Sender is TDBGridEh) and
      ((Sender as TDBGridEh).DataSource.DataSet <> nil) then
    begin
      //支持 tzquery, tzreadonlyquery,tzstoredproc 3种数据集
      if not (((Sender as TDBGridEh).DataSource.DataSet is TZQuery)
        or ((Sender as TDBGridEh).DataSource.DataSet is TZReadonlyQuery)
        or ((Sender as TDBGridEh).DataSource.DataSet is TZStoredProc)) then
        Exit;

      if not (Sender as TDBGridEh).DataSource.DataSet.Active then
        Exit;

      FieldName := Column.FieldName;
      if (Sender as TDBGridEh).DataSource.DataSet.FindField(FieldName).IsBlob then
        Exit;

      if (Sender as
        TDBGridEh).DataSource.DataSet.FieldByName(FieldName).FieldKind =
        fkData then
        SortStr := FieldName
      else if (Sender as
        TDBGridEh).DataSource.DataSet.FieldByName(FieldName).FieldKind =
        fkLookup then
        FieldName := (Sender as
          TDBGridEh).DataSource.DataSet.FieldByName(FieldName).KeyFields
      else
        FieldName := '';

      if (FieldName = '') or (Pos(';', FieldName) > 0) then
        Exit;

      if IsChString(fieldName) then exit;//不支持的中文字段不排序

      case Column.Title.SortMarker of
        smNoneEh:
          begin
            //Column.Title.SortMarker := smUpEh;
            TZQuery((Sender as TDBGridEh).DataSource.DataSet).SortedFields :=
              FieldName;
            TZQuery((Sender as TDBGridEh).DataSource.DataSet).SortType := stDescending;
          end;
        smUpEh:
          begin
            //Column.Title.SortMarker := smDownEh;
            TZQuery((Sender as TDBGridEh).DataSource.DataSet).SortedFields :=
              FieldName;
            TZQuery((Sender as TDBGridEh).DataSource.DataSet).SortType := stAscending;
          end;
        smDownEh:
          begin
            //Column.Title.SortMarker := smUpEh;
            TZQuery((Sender as TDBGridEh).DataSource.DataSet).SortedFields :=
              FieldName;
            TZQuery((Sender as TDBGridEh).DataSource.DataSet).SortType := stDescending;
          end;
      end;
    end;
  finally
    Screen.Cursor := crDefault;
  end;
end;

end.

转载于:https://www.cnblogs.com/apple1/archive/2009/10/27/1590410.html