public void ReadMyData(string myConnString) { string mySelectQuery = "SELECT OrderID, CustomerID FROM Orders"; SqlConnection myConnection = new SqlConnection(myConnString); SqlCommand myCommand = new SqlCommand(mySelectQuery,myConnection); myConnection.Open(); SqlDataReader myReader; myReader = myCommand.ExecuteReader(); // Always call Read before accessing data. while (myReader.Read()) { Console.WriteLine(myReader.GetInt32(0) + ", " + myReader.GetString(1)); } // always call Close when done reading. myReader.Close(); // Close the connection when done with it. myConnection.Close(); }
{
values=datareader["columnname"].ToString();
}
string mySelectQuery = "SELECT OrderID, CustomerID FROM Orders";
SqlConnection myConnection = new SqlConnection(myConnString);
SqlCommand myCommand = new SqlCommand(mySelectQuery,myConnection);
myConnection.Open();
SqlDataReader myReader;
myReader = myCommand.ExecuteReader();
// Always call Read before accessing data.
while (myReader.Read()) {
Console.WriteLine(myReader.GetInt32(0) + ", " + myReader.GetString(1));
}
// always call Close when done reading.
myReader.Close();
// Close the connection when done with it.
myConnection.Close();
}
我就是这么使用 datareader["columnname"].ToString();
可是就是取不出任何数据。我改成DataSet和DataTabe就可以了。
唉!天作弄我了。