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;

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