[C#]利用『TOP NOTIN』『TOP MAX』『OVER ROW_NUMBER』分页代码封装
分页是经久不衰的话题，在项目中也经常用到，这次特意封装下，方便后续使用，顺便整理知识点。而譬如三者效率以及其他分页方法，还待后续研究。
关键代码：
/// <summary> /// 利用[ROW_NUMBER() over]分页，生成sql语句 /// </summary> /// <param name="tableName">表名称『eg:Orders』</param> /// <param name="columns">需要显示列『*:所有列；或者：eg:OrderID,OrderDate,ShipName,ShipCountry』</param> /// <param name="orderColumn">依据排序的列『eg:OrderID』</param> /// <param name="orderType">升序降序『1：desc;其他:asc』</param> /// <param name="pSize">每页页数『需大于零』</param> /// <param name="pIndex">页数『从壹开始算』</param> /// <returns>生成分页sql脚本</returns> public static string PageDBWithRowNumberString(string tableName, string columns, string orderColumn, int orderType, int pSize, int pIndex) { CheckPageDbParameter(tableName, columns, orderColumn, pSize, pIndex); int _pageStart = pSize * (pIndex - 1) + 1; int _pageEnd = pSize * pIndex + 1; string _sql = string.Format("select * from (select (ROW_NUMBER() over(order by {2} {3})) as ROWNUMBER,{1} from {0})as tp where ROWNUMBER >= {4} and ROWNUMBER< {5} ", tableName, columns, orderColumn, orderType == 1 ? "desc" : "asc", _pageStart, _pageEnd); return _sql; } /// <summary> /// 利用[Top NotIn]分页，生成sql语句 /// </summary> /// <param name="tableName">表名称『eg:Orders』</param> /// <param name="columns">需要显示列『*:所有列；或者：eg:OrderID,OrderDate,ShipName,ShipCountry』</param> /// <param name="orderColumn">依据排序的列『eg:OrderID』</param> /// <param name="orderType">升序降序『1：desc;其他:asc』</param> /// <param name="pSize">每页页数『需大于零』</param> /// <param name="pIndex">页数『从壹开始算』</param> /// <returns>生成分页sql脚本</returns> public static string PageDBWithTopNotInString(string tableName, string columns, string orderColumn, int orderType, int pSize, int pIndex) { CheckPageDbParameter(tableName, columns, orderColumn, pSize, pIndex); /* *eg: *1=>SELECT orderID FROM Orders ORDER BY orderID *2=>SELECT TOP 20 orderID FROM Orders ORDER BY orderID //查询前一页数据 *3=> SELECT TOP 10 * FROM Orders WHERE (orderID NOT IN (SELECT TOP 20 orderID FROM Orders ORDER BY orderID)) ORDER BY orderID //在所有数据中，截去掉上一页数据(not in)，然后select top 10 即当前页数据 */ string _sql = string.Format("SELECT TOP {4} {1} FROM {0} WHERE ({2} NOT IN (SELECT TOP {5} {2} FROM {0} ORDER BY {2} {3})) ORDER BY {2} {3}", tableName, columns, orderColumn, orderType == 1 ? "desc" : "asc", pSize, (pIndex - 1) * pSize); return _sql; } private static void CheckPageDbParameter(string tableName, string columns, string orderColumn, int pSize, int pIndex) { if (string.IsNullOrEmpty(tableName)) throw new ArgumentNullException("tableName"); if (string.IsNullOrEmpty(columns)) throw new ArgumentNullException("columns"); if (string.IsNullOrEmpty(orderColumn)) throw new ArgumentNullException("orderColumn"); if (pSize <= 0) throw new ArgumentException("pageSize"); if (pIndex <= 0) throw new ArgumentNullException("pageIndex"); } /// <summary> /// 利用[Top Max]分页，生成sql语句 /// </summary> /// <param name="tableName">表名称『eg:Orders』</param> /// <param name="columns">需要显示列『*:所有列；或者：eg:OrderID,OrderDate,ShipName,ShipCountry』</param> /// <param name="orderColumn">依据排序的列『eg:OrderID』</param> /// <param name="orderType">升序降序『1：desc;其他:asc』</param> /// <param name="pSize">每页页数『需大于零』</param> /// <param name="pIndex">页数『从壹开始算』</param> /// <returns>生成分页sql脚本</returns> public static string PageDBWithTopMaxString(string tableName, string columns, string orderColumn, int orderType, int pSize, int pIndex) { CheckPageDbParameter(tableName, columns, orderColumn, pSize, pIndex); /* *eg: *1=>select top 30 orderID from Orders order by orderID asc *2=>(select max (orderID) from (select top 30 orderID from Orders order by orderID asc) as T) //查询前一页数据 *3=> select top 15 OrderID,OrderDate,ShipName,ShipCountry from Orders where orderID> ISNULL((select max (orderID) from (select top 30 orderID from Orders order by orderID asc) as T),0) order by orderID asc */ string _sql = string.Format("select top {4} {1} from {0} where {2}> ISNULL((select max ({2}) from (select top {5} {2} from {0} order by {2} {3}) as T),0) order by {2} {3}", tableName, columns, orderColumn, orderType == 1 ? "desc" : "asc", pSize, (pIndex - 1) * pSize); return _sql; } /// <summary> /// 获取分页总页数 /// </summary> /// <param name="recordCnt">总记录条数</param> /// <param name="pageSize">每页页数</param> /// <returns>分页总页数</returns> public static int GetPageTotalCount(int recordCnt, int pageSize) { if (recordCnt < 0) throw new ArgumentException("recordCnt"); if (pageSize < 0) throw new ArgumentException("pageSize"); int _pageTotalCount = recordCnt / pageSize; if (recordCnt % pageSize != 0) _pageTotalCount++; return _pageTotalCount; }
使用例子：
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using DBUtilHelpV2; namespace WindowsFormsApplication5 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } MSSQLToolV2 SQLHelper = new MSSQLToolV2(msConnectionString); static string msConnectionString = DBToolV2.BuilderMSSqlConnectString(@"YANZHIWEI-PC\SQLEXPRESS", "Northwind", "sa", "sasa"); static int pageTotalCount = 1;//总页数 static int pageSize = 15;//每页条数 static int pageIndex = 1;//当前页 private void Form1_Load(object sender, EventArgs e) { int _rocordTotalCount = GetReocordTotalCount(); pageTotalCount = DBToolV2.GetPageTotalCount(_rocordTotalCount, pageSize); lblTotalPage.Text = string.Format("总共{0}页", pageTotalCount.ToString()); PageDBWithRowNumber(pageIndex); } /// <summary> /// 分页操作 /// </summary> /// <param name="pIndex">页数『从1开始』</param> private void PageDBWithRowNumber(int pIndex) { string _sql = DBToolV2.PageDBWithTopNotInString("Orders", "OrderID,OrderDate,ShipName,ShipCountry", "orderID", 0, pageSize, pIndex); //string _sql = DBToolV2.PageDBWithRowNumberString("Orders", "OrderID,OrderDate,ShipName,ShipCountry", "orderID", 0, pageSize, pIndex); //string _sql = DBToolV2.PageDBWithTopMaxString("Orders", "OrderID,OrderDate,ShipName,ShipCountry", "orderID", 0, pageSize, pIndex); DataTable _pageTable = SQLHelper.ExecuteDataTable(_sql, null); if (_pageTable != null) { dataGridView1.DataSource = _pageTable; lblCurrentPage.Text = string.Format("当前{0}页", pageIndex); } } private int GetReocordTotalCount() { return Convert.ToInt32(SQLHelper.ExecuteScalar("select count(*) from Orders", null)); } /// <summary> /// 第一页 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void lblFirst_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) { pageIndex = 1; PageDBWithRowNumber(pageIndex); } /// <summary> /// 最后页 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) { pageIndex = pageTotalCount; PageDBWithRowNumber(pageIndex); } /// <summary> /// 上一页 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void lblPrepage_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) { if (pageIndex - 1 > 1) { pageIndex = pageIndex - 1; PageDBWithRowNumber(pageIndex); } } /// <summary> /// 下一页 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void lblNextpage_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) { if (pageIndex + 1 <= pageTotalCount) { pageIndex = pageIndex + 1; PageDBWithRowNumber(pageIndex); } } } }
上述代码效果
例子链接：https://www.dropbox.com/s/yfsvx4u4yz0gokn/PageDB20140313.zip