ADO.NET基础例子

参考：http://www.cnblogs.com/liuhaorain/archive/2012/02/06/2340409.html

增，删，改：

        public void InsertData(int x, int y)
        {
            #region using 
            string connStr = ConfigurationManager.ConnectionStrings["connStr"].ToString();
            using (SqlConnection conn = new SqlConnection(connStr))
            {
                string sqlStr = "insert into CalculatorService(num1,num2) values(@x,@y)";

                SqlCommand cmd = new SqlCommand(sqlStr, conn);

                SqlParameter[] paras = new SqlParameter[]{
                    new SqlParameter("@x",SqlDbType.Int),
                    new SqlParameter("@y",SqlDbType.Int)
                };
                paras[0].Value = x;
                paras[1].Value = y;
                foreach (var i in paras)
                {
                    cmd.Parameters.Add(i);
                }

                try
                {
                    conn.Open();
                    cmd.ExecuteNonQuery();
                }
                catch (Exception ex)
                {
                    //
                }
            }
            #endregion
        }

查：

 public List<int> SearchId(int x, int y)
        {
            string connStr = ConfigurationManager.ConnectionStrings["connStr"].ToString();
            using (SqlConnection conn = new SqlConnection(connStr))
            {
                string sqlStr = "select * from CalculatorService where Num1=@x and Num2=@y";

                SqlCommand cmd = new SqlCommand(sqlStr, conn);

                SqlParameter[] paras = new SqlParameter[]{
                    new SqlParameter("@x",SqlDbType.Int),
                    new SqlParameter("@y",SqlDbType.Int)
                };
                paras[0].Value = x;
                paras[1].Value = y;
                foreach (var i in paras)
                {
                    cmd.Parameters.Add(i);
                }
                List<int> l = new List<int>();
                try
                {
                    conn.Open();
                    SqlDataReader reader = cmd.ExecuteReader();
                    
                    if (reader != null && reader.HasRows) {
                        while (reader.Read()) {
                            for (int i = 0; i < reader.FieldCount; i++) {
                                if (reader.GetName(i) == "id") {
                                    l.Add(Convert.ToInt32(reader.GetValue(i)));
                                }
                            }
                        }
                    }
                    reader.Close();
                    return l;
                }
                catch (Exception ex)
                {
                    return l;
                }
            }

        }