| FFilterList.Count = 0 then
btnViewSummary.Enabled := false;
end;
end;
设置标准
procedure TMyDBFilterDialog.SetCriteria;
var
FilterIndex, i : Integer;
DisplayName : String;
begin
DisplayName := lstAllFields.Items[lstAllFields.ItemIndex];
i := 0;
FilterIndex := -1;
// Find the Item in the list if it exists
while (i < FFilterList.Count) and (FilterIndex < 0) do
begin
if TMyFieldInfo(FFilterList[i]).DisplayLabel = DisplayName then
FilterIndex := i;
Inc(i);
end;
if FilterIndex < 0 then
// This has no current criteria
ClearCriteria
else
begin
with TMyFieldInfo(FFilterList[FilterIndex]) do
begin
cbxCaseSensitive.Checked := CaseSensitive;
edtEndingRange.Text := EndingValue;
edtFieldValue.Text := FilterValue;
if MatchType <> fdMatchRange then
grpSearchType.ItemIndex := Integer(MatchType);
cbxNonMatching.Checked := NonMatching;
edtStartingRange.Text := StartingValue;
if MatchType = fdMatchRange then
pgeCriteria.ActivePage := tabByRange
else
pgeCriteria.ActivePage := tabByValue;
end;
end;
end;
重建SQL语句
procedure TDBFilterDialog.ReBuildSQL;
var
s, s1 : String;
SQL, NewSQL : TStringStream;
p, i : Integer;
hasWhere : boolean;
begin
//生成SQL语句
if FDialog.lstSelectedFields.Items.Count = 0 then //如果没有已选字段，则
begin
if TStrings(GetOrdProp(FDataSet, SQLProp)) <> FOriginalSQL then
RestoreSQL;
exit;
end;
NewSQL := TStringStream.Create(s1);
SQL := TStringStream.Create(s);
try //保存到流
FOriginalSQL.SaveToStream(SQL);
SQL.Seek( 0, soFromBeginning);
p := WordPos(''''WHERE'''', SQL.DataString);
if p = 0 then //如果SQL语句中没有WHERE子句
begin
hasWhere := false;
p := WordPos(''''GROUP'''', SQL.DataString);
if p = 0 then //如果SQL语句中没有GROUP子句
p := WordPos(''''HAVING'''', SQL.DataString);
if p = 0 then //如果SQL语句中没有HAVING子句
P := WordPos(''''ORDER'''', SQL.DataString);
if p = 0 then //如果SQL语句中没有ORDER子句
p := SQL.Size;
end
else
begin //SQL语句中有WHERE子句
hasWhere := true;
Inc(p, 5);
end;
NewSQL.WriteString(SQL.ReadString(p - 1));
if not hasWhere then //如果SQL语句中没有WHERE子句
NewSQL.WriteString('''' WHERE '''');
for i := 0 to FDialog.FilterList.Count - 1 do
begin
NewSQL.WriteString(FDialog[i].CreateSQL);
if i < FDialog.FilterList.Count - 1 then
NewSQL.WriteString('''' AND '''')
else
if hasWhere then
NewSQL.WriteString('''' AND '''');
end;
NewSQL.WriteString(SQL.ReadString(SQL.Size));
// 在执行SQL时暂停有所的控件
Application.MessageBox(PChar(NewSQL.DataString),''''123'''',MB_OK);
if FDataSet is TQuery then
with FDataSet as TQuery do
begin
DisableControls;
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