另一种分页方法

发表时间：2007-6-28 9:12:00

/// <summary>
        /// 单表分页
        /// </summary>
        /// <param name="condition">查询条件</param>
        /// <param name="sortField">排序字段</param>
        /// <param name="des">是否顺序</param>
        /// <param name="pageSize">每页数据条数</param>
        /// <param name="pageIndex">页索引(0开始)</param>
        /// <param name="recordCount">总记录条数(传入值小于0时返回)</param>
        /// <returns></returns>
        protected DataTable GetList(string table, string fields, string condition, string sortField, bool des, int pageSize, int pageIndex, ref int recordCount, params DbParameter[] parameterValues)
        {

            string tableWithWhere = table;

            if (condition != null && condition != "")
                tableWithWhere += " where " + condition;

            string sql = "";

            if (recordCount < 0)
            {
                string countSql = "select count(*) from {0}";
                if ((parameterValues == null) || (parameterValues.Length <= 0))
                {

                    recordCount = Convert.ToInt32(Beyondbit.Framework.DataAccess.DataAccess.ExecuteScalar(string.Format(countSql, tableWithWhere), CommandType.Text));
                }
                else
                {
                    countSql = string.Format(countSql, tableWithWhere);
                    recordCount = Convert.ToInt32(Beyondbit.Framework.DataAccess.DataAccess.ExecuteScalar(countSql, CommandType.Text, parameterValues));
                }
            }

            if (pageIndex == 0)
            {
                sql = "select TOP {0} {1} FROM {2} ORDER BY {3}";

                if (des)
                    sql = string.Format(sql, pageSize, fields, tableWithWhere, sortField);
                else
                    sql = string.Format(sql, pageSize, fields, tableWithWhere, sortField + " desc");
            }
            else
            {
                int pageCount = (recordCount / pageSize);
                int lastPage = (recordCount % pageSize);

                if (lastPage > 0)
                    pageCount++;

                sql = "select * FROM (SELECT TOP {0} * FROM (select TOP {1} {5} FROM {2} ORDER BY {3}) AS table1 ORDER BY {4}) AS table2 ORDER BY {3}";
                if ((pageIndex + 1) * pageSize <= recordCount)
                {
                    if (des)
                        sql = string.Format(sql, pageSize, pageSize * (1 + pageIndex), tableWithWhere, sortField, sortField + " desc", fields);
                    else
                        sql = string.Format(sql, pageSize, pageSize * (1 + pageIndex), tableWithWhere, sortField + " desc", sortField, fields);
                }
                else
                {
                    if (des)
                        sql = string.Format(sql, lastPage

                            , pageSize * (1 + pageIndex), tableWithWhere, sortField, sortField + " desc", fields);
                    else
                        sql = string.Format(sql, lastPage, pageSize * (1 + pageIndex), tableWithWhere, sortField + " desc", sortField, fields);
                }

            }
            if ((parameterValues == null) || (parameterValues.Length <= 0))
            {
                return Beyondbit.Framework.DataAccess.DataAccess.ExecuteDataset(sql, CommandType.Text).Tables[0];
            }
            else
            {
                return Beyondbit.Framework.DataAccess.DataAccess.ExecuteDataset(sql, CommandType.Text, parameterValues).Tables[0];
            }
        }