Delphi7 的 WebService 与 数据库

Server 端：

SoapDataModule中加入 ADOConnection1、ADODataSet1、DataSetProvider1；DataSetProvider1的DataSet设置为ADODataSet1；ADODataSet1的CommandText设置为空，Connection设置为ADOConnection1。
DataSetProvider1的DataRequest事件：
function TDataMod.DataSetProvider1DataRequest(Sender: TObject;
Input: OleVariant): OleVariant;
begin
if ADOConnection1.Connected then
begin
ADODataSet1.CommandText := Input;
Result := DataSetProvider1.Data;
end;
end;
procedure TDataMod.SoapDataModuleCreate(Sender: TObject);
var
DataPath: string;
const
SQL :string = 'Provider=Microsoft.Jet.OLEDB.4.0;Data Source=E:/programs/Delphi7/Demos/WebServices/SOAPDataModule/Data/Tree.mdb;Persist Security Info=False';
begin
DataPath := ExtractFilePath(Application.ExeName)+ '../Data/';
XMLTransformProvider1.XMLDataFile := DataPath + 'XML_Document.xml';
XMLTransformProvider1.TransformRead.TransformationFile := DataPath + 'ToDp.xtr';
XMLTransformProvider1.TransformWrite.TransformationFile := DataPath + 'ToXml.xtr';
try
ADOConnection1.Connected :=false;
ADOConnection1.ConnectionString:= SQL;
ADOConnection1.Connected :=true;
except
//showmessage(A_ParentPath+'Data/InfoMat.mdb 调用失败');
end;
end;

Client端：

SoapConnection1、ClientDataSet1；ClientDataSet1的ConnectionBroker属性为SoapConnection1，ProviderName属性为DataSetProvider1
查询记录集：
procedure TClientForm.Button1Click(Sender: TObject);
var SQL:string;
begin
if not SoapConnection1.Connected then
begin
SoapConnection1.URL:=URLList.Text+'/soap/IDataMod';
SoapConnection1.Open;
end;
SQL := Edit1.text;
with ClientDataSet1 do
begin
Data := DataRequest(SQL);
end;
end;