Question

我正在

“没有给出一个或多个必需参数的值”

从下面的代码看起来一切都很好找不到问题。

 string myConnectionString= @"Provider=Microsoft.Jet.OLEDB.4.0; Data source=D:\TiptonDB.mdb";
                string query = "SELECT NodeID FROM NDDINodes";//"SELECT O.NodeID, N.NodeID FROM NDDINodes AS N, NDDINodes AS O WHERE N.X=O.X And N.Y=O.Y And N.NodeID<>O.NodeID";

                DataSet dt = new DataSet();
                using (OleDbConnection myConnection = new OleDbConnection())
                {
                    myConnection.ConnectionString=myConnectionString;
                    OleDbCommand cmd=new OleDbCommand ();
                    cmd.Connection=myConnection;

                 //   cmd.CommandText="SELECT O.NodeID, N.NodeID FROM NDDINodes AS N, NDDINodes AS O WHERE N.X=O.X And N.Y=O.Y And N.NodeID<>O.NodeID";
                    myConnection.Open();
                    OleDbDataAdapter ad = new OleDbDataAdapter(query,myConnection);
                    ad.Fill(dt);
                }

Answer 1

只需在代码中添加

即可

  OleDbDataAdapter ad = new OleDbDataAdapter();
ad.SelectCommand = new OleDbCommand(query, myConnection);

Answer 2

string myConnectionString= @"Provider=Microsoft.Jet.OLEDB.4.0; Data source=D:\TiptonDB.mdb";
                string query = "SELECT NodeID FROM NDDINodes";//"SELECT O.NodeID, N.NodeID FROM NDDINodes AS N, NDDINodes AS O WHERE N.X=O.X And N.Y=O.Y And N.NodeID<>O.NodeID";

DataSet dt = new DataSet();

OleDbConnection objXConn = new OleDbConnection(myConnectionString);
                objXConn.Open();
                OleDbCommand objCommand = new OleDbCommand(query, objXConn);
                OleDbDataAdapter adp = new OleDbDataAdapter(objCommand);
                adp.Fill(dt);
                objXConn.Close();

Answer 3

确保您的连接字符串不缺少数据：UserName/Password，Persist Security Info=True，...

Check this link用于访问connectionString设置。

使用oledb填充数据集时出错

3 个答案: