【2017-04-21】Ado.Nte属性扩展

using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Text;

namespace ConsoleApplication1.App_Code
{
    public class UserNationData
    {
        SqlConnection conn;
        SqlCommand cmd;

        public UserNationData()
        {
            conn = new SqlConnection("server=.;database=Data0216;user=sa;pwd=123");
            cmd = conn.CreateCommand();
        }

        public string SelectNationName(string ncode)
        {
            string end = "<暂无>";

            cmd.CommandText = "select *from UserNation where NationCode = @a";
            cmd.Parameters.Clear();
            cmd.Parameters.AddWithValue("@a", ncode);

            try
            {
                conn.Open();
                SqlDataReader dr = cmd.ExecuteReader();
                if (dr.HasRows)
                {
                    dr.Read();
                    end = dr["NationName"].ToString();
                }
            }
            catch { }
            finally { conn.Close(); }
            return end;
        }
    }
}