sqlhelper里面数据库连接要怎么写 第2页

            {
                m_Conn.Open();
                SqlCommand cmd = new SqlCommand(query, m_Conn);
                string result = string.Empty;
                using (SqlDataReader dr = cmd.ExecuteReader())
                {
                    while (dr.Read())
                    {
                        if (passCount < 1)
                        {
                            result += "," + dr.GetInt32(0);
                        }
                        passCount--;
                    }
                }
                m_Conn.Close();
                m_Conn.Dispose();
                return result.Substring(1);
            }
        }
        /// <summary>
        /// ACCESS高效分页
        /// </summary>
        /// <param name="pageIndex">当前页码</param>
        /// <param name="pageSize">分页容量</param>
        /// <param name="strKey">主键</param>
        /// <param name="showString">显示的字段</param>
        /// <param name="queryString">查询字符串，支持联合查询</param>
        /// <param name="whereString">查询条件，若有条件限制则必须以where 开头</param>
        /// <param name="orderString">排序规则</param>
        /// <param name="pageCount">传出参数：总页数统计</param>
        /// <param name="recordCount">传出参数：总记录统计</param>
        /// <returns>装载记录的DataTable</returns>
        public static DataTable ExecutePager(int pageIndex, int pageSize, string strKey, string showString, string queryString, string whereString, string orderString, out int pageCount, out int recordCount)
        {
            if (pageIndex < 1) pageIndex = 1;
            if (pageSize < 1) pageSize = 10;
            if (string.IsNullOrEmpty(showString)) showString = "*";
            if (string.IsNullOrEmpty(orderString)) orderString = strKey + " asc ";
            using (OleDbConnection m_Conn = new OleDbConnection(ConnectionString))
            {
                m_Conn.Open();
                string myVw = string.Format(" ( {0} ) tempVw ", queryString);
                OleDbCommand cmdCount = new OleDbCommand(string.Format(" select count(*) as recordCount from {0} {1}", myVw, whereString), m_Conn);

                recordCount = Convert.ToInt32(cmdCount.ExecuteScalar());

                if ((recordCount % pageSize) > 0)
                    pageCount = recordCount / pageSize + 1;
                else
                    pageCount = recordCount / pageSize;
                OleDbCommand cmdRecord;
                if (pageIndex == 1)//第一页
                {
                    cmdRecord = new OleDbCommand(string.Format("select top {0} {1} from {2} {3} order by {4} ", pageSize, showString, myVw, whereString, orderString), m_Conn);
                }
                else if (pageIndex > pageCount)//超出总页数
                {
                    cmdRecord = new OleDbCommand(string.Format("select top {0} {1} from {2} {3} order by {4} ", pageSize, showString, myVw, "where 1=2", orderString), m_Conn);
                }
                else
                {
                    int pageLowerBound = pageSize * pageIndex;
                    int pageUpperBound = pageLowerBound - pageSize;
                    string recordIDs = recordID(string.Format("select top {0} {1} from {2} {3} order by {4} ", pageLowerBound, strKey, myVw, whereString, orderString), pageUpperBound);
                    cmdRecord = new OleDbCommand(string.Format("select {0} from {1} where {2} in ({3}) order by {4} ", showString, myVw, strKey, recordIDs, orderString), m_Conn);

                }
                OleDbDataAdapter dataAdapter = new OleDbDataAdapter(cmdRecord);
                DataTable dt = new DataTable();
                dataAdapter.Fill(dt);
                m_Conn.Close();
                m_Conn.Dispose();
                return dt;
            }
        }
        //////////////////////////////////////////////////添加的方法///////////////////////////////

        /// <summary>
        /// 根据数据库连接字符串,创建数据库连接对象
        /// </summary>
        /// <param name="connectionString">数据库连接字符串</param>
        /// <returns>数据库连接对象</returns>       
        public static SqlConnection CreateDbConnection(string connectionString)
        {
            return new SqlConnection(connectionString);
        }

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