SQL DBHelper

[1]C#連接SQL Service 幫助類 

 class DBhelps{
          //獲取配置文件（Web.config文件）中的連接字符串
        private static readonly string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        //執行update delete insert 操作
        //ExecuteNonQuery()
        public static int ExecuteNonQuery(string sql, CommandType cmdtype, params SqlParameter[] pms)
        {
            using (SqlConnection con = new SqlConnection(constr))
            {
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    cmd.CommandType = cmdtype;//設置執行的SQL語句的類型
                    if (pms != null)
                    {
                        cmd.Parameters.AddRange(pms);
                    }
                    con.Open();
                    return cmd.ExecuteNonQuery();
                }
            }
        }

        //執行返回一個值得select語句
        //ExecuteSclare()
        public static object ExectueScalar(string sql, CommandType cmdtype, params SqlParameter[] pms)
        {
            using (SqlConnection con = new SqlConnection(constr))
            {
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    cmd.CommandType = cmdtype;
                    if (pms != null)
                    {
                        cmd.Parameters.AddRange(pms);
                    }
                    con.Open();
                    return cmd.ExecuteScalar();
                }
            }
        }

        //執行返回多個值得select語句
        //ExecuteReader()
        public static SqlDataReader ExecuteReader(string sql, CommandType cmdtype, params SqlParameter[] pms)
        {
            SqlConnection con = new SqlConnection(constr);
            using (SqlCommand cmd = new SqlCommand(sql, con))
            {
                cmd.CommandType = cmdtype;
                if (pms != null)
                {
                    cmd.Parameters.AddRange(pms);
                }
                try
                {
                    con.Open();
                    return cmd.ExecuteReader(CommandBehavior.CloseConnection);
                }
                catch
                {

                    con.Close();
                    con.Dispose();
                    throw;
                }
            }
        }

        //執行返回一張表
        //ExeuteAapter()
        public static DataTable SqlDataAdapter(string sql, CommandType cmdtype, params SqlParameter[] pms)
        {
            DataTable table = new DataTable();
            using (SqlDataAdapter adapter = new SqlDataAdapter(sql, constr))
            {
                adapter.SelectCommand.CommandType = cmdtype;
                if (pms != null)
                {
                    adapter.SelectCommand.Parameters.AddRange(pms);
                }
                adapter.Fill(table);
            }
            return table;
        }
    }