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通用查询组件设计
作者：nxyc_twz@163.com
前段时间由于工作较忙，无暇整理本组件的相关文档，请大家谅解！以后我会陆续整理公布该组件的所有相关文档及源码！
保存参数值
procedure TDBFilterDialog.SaveParamValues;
var
i : Integer;
begin
//保存参数值
for i := 0 to FOriginalVariables.Count - 1 do
TDBVariable(FOriginalVariables[i]).VariableValue :=
TQuery(FDataSet).ParamByName(TDBVariable(FOriginalVariables[i]).VariableName).Value;
end;
点击确定按钮
procedure TMyDBFilterDialog.btnOkClick(Sender: TObject);
var
i : Integer;
f : TMyFieldInfo;
begin
//点击确定按钮
for i := FPreviousList.Count - 1 downto 0 do
begin
TMyFieldInfo(FPreviousList[i]).Free;
FPreviousList.Delete(i);
end;
GetCriteria;//获取标准
SetCriteria;//设置标准
for i := 0 to FFilterList.Count - 1 do
begin
f := TMyFieldInfo.Create;//字段定义类
f.Assign(TMyFieldInfo(FFilterList[i]));
FPreviousList.Add(f);
end;
end;
获取标准
procedure TMyDBFilterDialog.GetCriteria ;
//获取标准
var
FilterIndex, i : Integer;
begin
FilterIndex := -1;
i := 0;
while (i < FFilterList.Count) and (FilterIndex < 0) do
begin
if TMyFieldInfo(FFilterList[i]).DisplayLabel = lstAllFields.Items[LastIndex] then
FilterIndex := i;
Inc(i);
end;
// This is only enabled when at least one of the fields has entry
if btnNewSearch.Enabled then
begin
// The user added a new criteria
if FilterIndex < 0 then
begin
FFilterList.Add(TMyFieldInfo.Create);
FilterIndex := FFilterList.Count - 1;
lstSelectedFields.Items.AddObject(lstAllFields.Items[LastIndex],
lstAllFields.Items.Objects[LastIndex]);
end;
// Set the fields
with TMyFieldInfo(FFilterList[FilterIndex]) do
begin
CaseSensitive := cbxCaseSensitive.Checked;
DisplayLabel := lstAllFields.Items[LastIndex];
// Save off the TField for this field
FieldName := TField(lstAllFields.Items.Objects[LastIndex]).FieldName;
FieldOrigin := TField(lstAllFields.Items.Objects[LastIndex]).Origin;
FieldType := TField(lstAllFields.Items.Objects[LastIndex]).DataType;
// Match Criteria is either Range or one of the other 4
if pgeCriteria.ActivePage = tabByRange then
MatchType := fdMatchRange
else
MatchType := TDBFilterMatchType(grpSearchType.ItemIndex);
// Only save the criteria that they want to work with
if MatchType = fdMatchRange then
begin
EndingValue := edtEndingRange.Text;
StartingValue := edtStartingRange.Text;
FilterValue := '''''''';
end
else
begin
EndingValue := '''''''';
StartingValue := '''''''';
FilterValue := edtFieldValue.Text;
end;
NonMatching := cbxNonMatching.Checked;
end;
end
else
// The user removed a criteria that existed
if FilterIndex >= 0 then
begin
// remove the Selected list item
lstSelectedFields.Items.Delete(lstSelectedFields.Items.IndexOf(
TMyFieldInfo(FFilterList[FilterIndex]).DisplayLabel));
// Free the FieldInfo Object
TMyFieldInfo(FFilterList[FilterIndex]).Free;
// Delete it from the list
FFilterList.Delete(FilterIndex);
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