49 lines
1.9 KiB
C#
49 lines
1.9 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Linq;
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using System.Text;
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namespace BLL
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{
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public static class PagingHelper
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{
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/// <summary>
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/// 获取分页SQL语句，默认ROW_NUMBER为关健字，所有表不允许使用该字段名
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/// </summary>
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/// <param name="_recordCount">记录总数</param>
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/// <param name="_pageSize">每页记录数</param>
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/// <param name="_pageIndex">当前页数</param>
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/// <param name="_safeSql">SQL查询语句</param>
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/// <param name="_orderField">排序字段，多个则用“,”隔开</param>
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/// <returns>分页SQL语句</returns>
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public static DataTable CreatePage(int _pageSize, int _pageIndex, string _safeSql, string _orderField, IDataParameter[] parameters, out int RecordCount)
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{
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//拼接SQL字符串，加上ROW_NUMBER函数进行分页
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StringBuilder newSafeSql = new StringBuilder();
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newSafeSql.AppendFormat("SELECT ROW_NUMBER() OVER(ORDER BY {0}) as RowIndex,", _orderField);
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newSafeSql.Append(_safeSql.Substring(_safeSql.ToUpper().IndexOf("SELECT") + 6));
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//拼接成最终的SQL语句
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StringBuilder sbSql = new StringBuilder();
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sbSql.Append("SELECT * FROM (");
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sbSql.Append(newSafeSql.ToString());
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sbSql.Append(") AS T");
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sbSql.AppendFormat(" WHERE RowIndex > {0} and RowIndex<={1}", ((_pageIndex - 1) * _pageSize), _pageIndex * _pageSize);
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sbSql.Append(" ");
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sbSql.AppendFormat(" SELECT COUNT(1) AS RecordCount FROM ({0}) AS T ", _safeSql);
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//return sbSql.ToString();
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DataSet ds = SQLHelper.RunSqlStrings(sbSql.ToString(), parameters);
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DataTable table = ds.Tables[0];
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RecordCount = int.Parse(ds.Tables[1].Rows[0]["RecordCount"].ToString());
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return table;
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}
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}
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}
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