通用分页取数据

本方法是基于：select top 10 * from (select top 32  * from TD_Articles order by ID desc) where  order by ID desc产生的，此方法已经过测试

1.方法如下：

 #region 获取当前页显示记录
        /// <summary>
        /// 获取当前页显示记录
        /// </summary>
        /// <param name="pageIndex">当前页码</param>
        /// <param name="pageSize">分页容量</param>
        /// <param name="strFieldName">显示的字段</param>
        /// <param name="strTableName">表名列表</param>
        /// <param name="strWhere">条件列表</param>
        /// <param name="strOrder">排序列表</param>
        /// <param name="strAscDesc">排序方式：1为升序，0为降序</param>
        /// <param name="pageCount">传出参数:总页数统计</param>
        /// <param name="recordCount">传出参数:总记录数统计</param>
        /// <returns></returns>
        public static DataSet GetPager(int pageIndex, int pageSize, string strKey, string strFieldName, string strTableName, string strWhere, string strOrder, string strAscDesc, out int pageCount, out int recordCount)
        {
            DataSet ReturnDs = new DataSet();
            OleDbConnection connection = new OleDbConnection(connectionString);
            StringBuilder cmdText = new StringBuilder();
            string strOrdert = string.Empty;
            if (pageIndex < 0) pageIndex = 1;
            if (pageSize < 0) pageSize = 10;
            if (string.IsNullOrEmpty(strKey)) strKey = "*";
            if (string.IsNullOrEmpty(strFieldName)) strFieldName = "*";
            try
            {
                if (string.IsNullOrEmpty(strWhere))
                {
                    strWhere = "";
                }
                else
                {
                    strWhere = " where " + strWhere;
                }
                if (!string.IsNullOrEmpty(strOrder))
                {
                    strOrdert = strOrder = " order by " + strOrder;
                }

                if (!string.IsNullOrEmpty(strAscDesc))
                {
                    if (strAscDesc == "1")
                    {
                        strOrder += " Asc";
                        strOrdert += " Desc";
                    }
                    else if (strAscDesc == "0")
                    {
                        strOrder += " Desc";
                        strOrdert += " Asc";
                    }
                }
                recordCount = Convert.ToInt32(DbHelperOleDb.ExecuteSclar(string.Format("select count({0}) from {1} {2}", strKey, strTableName, strWhere)));
                if ((recordCount % pageSize) > 0)
                {
                    pageCount = recordCount / pageSize + 1;
                }
                else
                {
                    pageCount = recordCount / pageSize;
                }
                if (pageIndex == 1 && pageIndex != pageCount)//第一页
                {
                    cmdText.Append("select top " + pageSize + " " + strFieldName + " from " + strTableName + "" + strWhere + "" + strOrder + "");
                }
                else if (pageIndex > pageCount)//超出总页数
                {
                    cmdText.Append("select top " + pageSize + " " + strFieldName + " from " + strTableName + " where 1=2 " + strOrder + "");
                }
                else if (pageIndex == pageCount && pageIndex != 1)//是最后一页
                {
                    string recordT = string.Format("select top {0} {1} from {2} {3} {4} ", pageSize * pageIndex, strFieldName, strTableName, strWhere, strOrder);
                    cmdText.Append("select top " + (recordCount - pageSize * (pageIndex - 1)) + " * from (" + recordT + ")" + strOrdert + "");

                }
                else//不是第一页
                {
                    string recordT = string.Format("select top {0} {1} from {2} {3} {4} ", pageSize * pageIndex, strFieldName, strTableName, strWhere, strOrder);
                    cmdText.Append("select top " + pageSize + " * from (" + recordT + ")" + strOrdert + "");

                }

                if (connection.State == ConnectionState.Closed)
                {
                    connection.Open();
                }

                OleDbCommand cmd = new OleDbCommand(cmdText.ToString(), connection);
                OleDbDataAdapter da = new OleDbDataAdapter(cmd);

                if (connection.State == ConnectionState.Open)
                {
                    connection.Close();
                }
                da.Fill(ReturnDs, "ds");
            }
            catch (System.Data.OleDb.OleDbException e)
            {
                throw new Exception(e.Message);
            }
            return ReturnDs;
        }
        #endregion

2.dal层：

 /// <summary>
        /// 分页获得DataTable
        /// </summary>
        public DataTable GetDataTable(int pageIndex, int pageSize, string strKey, string strFieldName, string strTableName, string strWhere, string strOrder,string strAscDesc, out int pageCount, out int recordCount)
        {
            return DbHelperOleDb.GetPager(pageIndex, pageSize, strKey, strFieldName, strTableName, strWhere, strOrder,strAscDesc, out pageCount, out recordCount).Tables[0];
        }

bll层：

 /// <summary>
        /// 分页获得DataTable
        /// </summary>
        public DataTable GetDataTable(int pageIndex, int pageSize, string strKey, string strFieldName, string strTableName, string strWhere, string strOrder, string strAscDesc, out int pageCount, out int recordCount)
        {
            return dal.GetDataTable(pageIndex, pageSize, strKey, strFieldName, strTableName, strWhere, strOrder,strAscDesc, out pageCount, out recordCount);
        }

3.调用示例：

 int pageCount = 0;
            int recordCount = 0;
            DataTable dt = bllArticles.GetDataTable(curPage,
                                                       15,
                                                       "TD_Articles.ID",
                                                       "TD_Articles.*,TD_Base_Class.ClassName",
                                                       "TD_Articles left join TD_Base_Class on TD_Articles.ClassID=TD_Base_Class.ID",
                                                       sTj,
                                                       "CreateDate",
                                                       "0",
                                                       out pageCount,
                                                       out recordCount);