1、环境:VS2013 SQL Server2012
2、数据库脚本:
with CTE as ( -->Begin 一个定位点成员 select Id,MenuName,ParentId,cast(MenuName as nvarchar(max)) as TE,OrderNum, --ROW_NUMBER()over(order by getdate()) as OrderID CAST( (CASE WHEN OrderNum < 10 THEN ‘00‘+LTRIM(OrderNum) ELSE ‘0‘+LTRIM(OrderNum) END) AS VARCHAR(100)) AS numstr --最关键是上面这个字段,要获取排序字段,按字符串来排序。 --其中窗口函数必须要使用order by,但是不能用整型,那就用时间吧 from Main_Menu where ParentId = 0 -->End union all -->Begin一个递归成员 select Main_Menu.ID, Main_Menu.MenuName,Main_Menu.ParentId,cast(replicate(‘ ‘,len(CTE.TE))+‘|_‘+Main_Menu.MenuName as nvarchar(MAX)) as TE,Main_Menu.OrderNum, --CTE.OrderNum*100+Main_Menu.OrderNum as OrderNum --Main_Menu.OrderNum CAST( (CTE.numstr+ CASE WHEN Main_Menu.OrderNum < 10 THEN ‘00‘+LTRIM(Main_Menu.OrderNum) ELSE ‘0‘+LTRIM(Main_Menu.OrderNum) END) AS VARCHAR(100) ) AS numstr from Main_Menu inner join CTE on Main_Menu.ParentId=CTE.Id -->End ) select * from CTE order by LTRIM(numstr) --最后将这个整型数据转换为字符串型的进行排序
3、C#代码:
public class readexcel { #region Excel2003 /// <summary> /// 将Excel文件中的数据读出到DataTable中(xls) /// </summary> /// <param name="file"></param> /// <returns></returns> public static DataTable ExcelToTableForXLS(string file) { DataTable dt = new DataTable(); using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read)) { HSSFWorkbook hssfworkbook = new HSSFWorkbook(fs); ISheet sheet = hssfworkbook.GetSheetAt(0); //表头 IRow header = sheet.GetRow(sheet.FirstRowNum); List<int> columns = new List<int>(); for (int i = 0; i < header.LastCellNum; i++) { object obj = GetValueTypeForXLS(header.GetCell(i) as HSSFCell); if (obj == null || obj.ToString() == string.Empty) { dt.Columns.Add(new DataColumn("Columns" + i.ToString())); //continue; } else dt.Columns.Add(new DataColumn(obj.ToString())); columns.Add(i); } //数据 for (int i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++) { DataRow dr = dt.NewRow(); bool hasValue = false; foreach (int j in columns) { if (sheet.GetRow(i)==null) { continue; } dr[j] = GetValueTypeForXLS(sheet.GetRow(i).GetCell(j) as HSSFCell); if (dr[j] != null && dr[j].ToString() != string.Empty) { hasValue = true; } } if (hasValue) { dt.Rows.Add(dr); } } } return dt; } /// <summary> /// 将DataTable数据导出到Excel文件中(xls) /// </summary> /// <param name="dt"></param> /// <param name="file"></param> public static void TableToExcelForXLS(DataTable dt, string file) { HSSFWorkbook hssfworkbook = new HSSFWorkbook(); ISheet sheet = hssfworkbook.CreateSheet("Test"); //表头 IRow row = sheet.CreateRow(0); for (int i = 0; i < dt.Columns.Count; i++) { ICell cell = row.CreateCell(i); cell.SetCellValue(dt.Columns[i].ColumnName); } //数据 for (int i = 0; i < dt.Rows.Count; i++) { IRow row1 = sheet.CreateRow(i + 1); for (int j = 0; j < dt.Columns.Count; j++) { ICell cell = row1.CreateCell(j); cell.SetCellValue(dt.Rows[i][j].ToString()); } } //转为字节数组 MemoryStream stream = new MemoryStream(); hssfworkbook.Write(stream); var buf = stream.ToArray(); //保存为Excel文件 using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write)) { fs.Write(buf, 0, buf.Length); fs.Flush(); } } /// <summary> /// 获取单元格类型(xls) /// </summary> /// <param name="cell"></param> /// <returns></returns> private static object GetValueTypeForXLS(HSSFCell cell) { if (cell == null) return null; switch (cell.CellType) { case CellType.Blank: //BLANK: return null; case CellType.Boolean: //BOOLEAN: return cell.BooleanCellValue; case CellType.Numeric: //NUMERIC: return cell.NumericCellValue; case CellType.String: //STRING: return cell.StringCellValue; case CellType.Error: //ERROR: return cell.ErrorCellValue; case CellType.Formula: //FORMULA: default: return "=" + cell.CellFormula; } } #endregion }
时间: 2024-10-18 13:56:41