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string strConnection="Provider=Microsoft.Jet.OleDb.4.0;";
strConnection+=@"Data Source=MapPath("Êý¾Ý¿â.mdb");//ÕâÀïÊÇÏà¶Ô·¾¶

OleDbConnection objConnection=new OleDbConnection(strConnection);
objConnection.open();

string  strSQL="SELECT  *  from  Table";
OleDbCommand Comm = new OleDbCommand(strSQL, objConnection);

OleDbDataReader adr = Comm.ExecuteReader();

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objConnection.close();

<add name="xkConnStr" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\XKArticle.mdb" providerName="System.Data.OleDb"/>

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public static OleDbDataReader ExecuteReader(string strSQL)   
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procedure TExInput.Excel1Click(Sender: TObject); //ʵÏÖExcelµ¼ÈëSQL
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_RecordsetPtr pRst(__uuidof(Recordset));
pConn->ConnectionString="Provider ......
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