From a4f960a1d258beb03ba5865cd4f2a3416f1e6694 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=AB=A5=E6=AF=93=E6=B3=BD?= <13204402429@stu.ecnu.edu.cn>
Date: Sun, 17 Jan 2021 21:40:05 +0800
Subject: [PATCH] =?UTF-8?q?=E5=88=A0=E9=99=A4=20'PagingHelper.cs'?=
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---
 PagingHelper.cs | 133 --------------------------------------------------------
 1 file changed, 133 deletions(-)
 delete mode 100644 PagingHelper.cs

diff --git a/PagingHelper.cs b/PagingHelper.cs
deleted file mode 100644
index 05c6918..0000000
--- a/PagingHelper.cs
+++ /dev/null
@@ -1,133 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
-
-namespace Basic
-{
-    /// <summary>  
-    /// 双TOP二分法生成分页SQL类(支持MSSQL、ACCESS)
-    /// </summary>  
-    public static class PagingHelper
-    {
-        /// <summary>
-        /// 获取分页SQL语句，排序字段需要构成唯一记录
-        /// </summary>
-        /// <param name="_recordCount">记录总数</param>
-        /// <param name="_pageSize">每页记录数</param>
-        /// <param name="_pageIndex">当前页数</param>
-        /// <param name="_safeSql">SQL查询语句</param>
-        /// <param name="_orderField">排序字段，多个则用“,”隔开</param>
-        /// <returns>分页SQL语句</returns>
-        public static string CreatePagingSql(int _recordCount, int _pageSize, int _pageIndex, string _safeSql, string _orderField)
-        {
-            //重新组合排序字段，防止有错误
-            string[] arrStrOrders = _orderField.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
-            StringBuilder sbOriginalOrder = new StringBuilder(); //原排序字段
-            StringBuilder sbReverseOrder = new StringBuilder(); //与原排序字段相反，用于分页
-            for (int i = 0; i < arrStrOrders.Length; i++)
-            {
-                arrStrOrders[i] = arrStrOrders[i].Trim();  //去除前后空格
-                if (i != 0)
-                {
-                    sbOriginalOrder.Append(", ");
-                    sbReverseOrder.Append(", ");
-                }
-                sbOriginalOrder.Append(arrStrOrders[i]);
-
-                int index = arrStrOrders[i].IndexOf(" "); //判断是否有升降标识
-                if (index > 0)
-                {
-                    //替换升降标识，分页所需
-                    bool flag = arrStrOrders[i].IndexOf(" DESC", StringComparison.OrdinalIgnoreCase) != -1;
-                    sbReverseOrder.AppendFormat("{0} {1}", arrStrOrders[i].Remove(index), flag ? "ASC" : "DESC");
-                }
-                else
-                {
-                    sbReverseOrder.AppendFormat("{0} DESC", arrStrOrders[i]);
-                }
-            }
-
-            //计算总页数
-            _pageSize = _pageSize == 0 ? _recordCount : _pageSize;
-            int pageCount = (_recordCount + _pageSize - 1) / _pageSize;
-
-            //检查当前页数
-            if (_pageIndex < 1)
-            {
-                _pageIndex = 1;
-            }
-            else if (_pageIndex > pageCount)
-            {
-                _pageIndex = pageCount;
-            }
-
-            StringBuilder sbSql = new StringBuilder();
-            //第一页时，直接使用TOP n，而不进行分页查询
-            if (_pageIndex == 1)
-            {
-                sbSql.AppendFormat(" SELECT TOP {0} * ", _pageSize);
-                sbSql.AppendFormat(" FROM ({0}) AS T ", _safeSql);
-                sbSql.AppendFormat(" ORDER BY {0} ", sbOriginalOrder.ToString());
-            }
-            //最后一页时，减少一个TOP
-            else if (_pageIndex == pageCount)
-            {
-                sbSql.Append(" SELECT * FROM ");
-                sbSql.Append(" ( ");
-                sbSql.AppendFormat(" SELECT TOP {0} * ", _recordCount - _pageSize * (_pageIndex - 1));
-                sbSql.AppendFormat(" FROM ({0}) AS T ", _safeSql);
-                sbSql.AppendFormat(" ORDER BY {0} ", sbReverseOrder.ToString());
-                sbSql.Append(" ) AS T ");
-                sbSql.AppendFormat(" ORDER BY {0} ", sbOriginalOrder.ToString());
-            }
-            //前半页数时的分页
-            else if (_pageIndex <= (pageCount / 2 + pageCount % 2) + 1)
-            {
-                sbSql.Append(" SELECT * FROM ");
-                sbSql.Append(" ( ");
-                sbSql.AppendFormat(" SELECT TOP {0} * FROM ", _pageSize);
-                sbSql.Append(" ( ");
-                sbSql.AppendFormat(" SELECT TOP {0} * ", _pageSize * _pageIndex);
-                sbSql.AppendFormat(" FROM ({0}) AS T ", _safeSql);
-                sbSql.AppendFormat(" ORDER BY {0} ", sbOriginalOrder.ToString());
-                sbSql.Append(" ) AS T ");
-                sbSql.AppendFormat(" ORDER BY {0} ", sbReverseOrder.ToString());
-                sbSql.Append(" ) AS T ");
-                sbSql.AppendFormat(" ORDER BY {0} ", sbOriginalOrder.ToString());
-            }
-            //后半页数时的分页
-            else
-            {
-                sbSql.AppendFormat(" SELECT TOP {0} * FROM ", _pageSize);
-                sbSql.Append(" ( ");
-                sbSql.AppendFormat(" SELECT TOP {0} * ", ((_recordCount % _pageSize) + _pageSize * (pageCount - _pageIndex) + 1));
-                sbSql.AppendFormat(" FROM ({0}) AS T ", _safeSql);
-                sbSql.AppendFormat(" ORDER BY {0} ", sbReverseOrder.ToString());
-                sbSql.Append(" ) AS T ");
-                sbSql.AppendFormat(" ORDER BY {0} ", sbOriginalOrder.ToString());
-            }
-            return sbSql.ToString();
-        }
-
-        /// <summary>
-        /// 获取记录总数SQL语句
-        /// </summary>
-        /// <param name="_n">限定记录数</param>
-        /// <param name="_safeSql">SQL查询语句</param>
-        /// <returns>记录总数SQL语句</returns>
-        public static string CreateTopnSql(int _n, string _safeSql)
-        {
-            return string.Format(" SELECT TOP {0} * FROM ({1}) AS T ", _n, _safeSql);
-        }
-
-        /// <summary>
-        /// 获取记录总数SQL语句
-        /// </summary>
-        /// <param name="_safeSql">SQL查询语句</param>
-        /// <returns>记录总数SQL语句</returns>
-        public static string CreateCountingSql(string _safeSql)
-        {
-            return string.Format(" SELECT COUNT(1) AS RecordCount FROM ({0}) AS T ", _safeSql);
-        }
-    }
-}