近来在做报表统计方面的需求,涉及到行转列报表。依据以往履历运用SQL能够比较轻易完成,此次决议应战一下直接经由过程代码体式格局完成行转列。时期碰到几个题目和用到的新知识这里整顿纪录一下。
浏览目次
题目引见
动态Linq
System.Linq.Dynamic别的用法
总结
题目引见
以家庭月度用度为例,能够在[Name,Area,Month]三个维度上随便组合举行分组,三个维度中挑选一个做为列显现。
/// <summary> /// 家庭用度状况 /// </summary> public class House { /// <summary> /// 户主姓名 /// </summary> public string Name { get; set; } /// <summary> /// 所属行政地区 /// </summary> public string Area { get; set; } /// <summary> /// 月份 /// </summary> public string Month { get; set; } /// <summary> /// 电费金额 /// </summary> public double DfMoney { get; set; } /// <summary> /// 水脚金额 /// </summary> public double SfMoney { get; set; } /// <summary> /// 燃气金额 /// </summary> public double RqfMoney { get; set; } }
户主-月明细报表 | ||||||
户主姓名 | 2016-01 | 2016-02 | ||||
---|---|---|---|---|---|---|
电费 | 水脚 | 燃气费 | 电费 | 水脚 | 燃气费 | |
张三 | 240.9 | 30 | 25 | 167 | 24.5 | 17.9 |
李四 | 56.7 | 24.7 | 13.2 | 65.2 | 18.9 | 14.9 |
地区-月明细报表 | ||||||
户主姓名 | 2016-01 | 2016-02 | ||||
---|---|---|---|---|---|---|
电费 | 水脚 | 燃气费 | 电费 | 水脚 | 燃气费 | |
江夏区 | 2240.9 | 330 | 425 | 5167 | 264.5 | 177.9 |
洪山区 | 576.7 | 264.7 | 173.2 | 665.2 | 108.9 | 184.9 |
地区月份-户明细报表 | |||||||
地区 | 月份 | 张三 | 李四 | ||||
---|---|---|---|---|---|---|---|
燃气费 | 电费 | 水脚 | 燃气费 | 电费 | 水脚 | ||
江夏区 | 2016-01 | 2240.9 | 330 | 425 | 5167 | 264.5 | 177.9 |
洪山区 | 2016-01 | 576.7 | 264.7 | 173.2 | 665.2 | 108.9 | 184.9 |
江夏区 | 2016-02 | 3240.9 | 430 | 525 | 6167 | 364.5 | 277.9 |
洪山区 | 2016-02 | 676.7 | 364.7 | 273.2 | 765.2 | 208.9 | 284.9 |
如今背景查出来的数据是List<House>范例,前台传过来分组维度和动态列字段。
第1个表格前台传给背景参数
{DimensionList:['Name'],DynamicColumn:'Month'}
第2个表格前台传给背景参数
{DimensionList:['Area'],DynamicColumn:'Month'}
第3个表格前台传给背景参数
{DimensionList:['Area','Month'],DynamicColumn:'Name'}
题目形貌清晰后,仔细分析后你就会发明这里的困难在于动态分组,也就是怎样依据前台传过来的多个维度对List举行分组。
动态Linq
下面运用System.Linq.Dynamic完成行转列功用,Nuget上搜刮System.Linq.Dynamic即可下载该包。
代码举行了封装,完成了通用的List<T>行转列功用。
/// <summary> /// 动态Linq体式格局完成行转列 /// </summary> /// <param name="list">数据</param> /// <param name="DimensionList">维度列</param> /// <param name="DynamicColumn">动态列</param> /// <returns>行转列后数据</returns> private static List<dynamic> DynamicLinq<T>(List<T> list, List<string> DimensionList, string DynamicColumn, out List<string> AllDynamicColumn) where T : class { //猎取一切动态列 var columnGroup = list.GroupBy(DynamicColumn, "new(it as Vm)") as IEnumerable<IGrouping<dynamic, dynamic>>; List<string> AllColumnList = new List<string>(); foreach (var item in columnGroup) { if (!string.IsNullOrEmpty(item.Key)) { AllColumnList.Add(item.Key); } } AllDynamicColumn = AllColumnList; var dictFunc = new Dictionary<string, Func<T, bool>>(); foreach (var column in AllColumnList) { var func = DynamicExpression.ParseLambda<T, bool>(string.Format("{0}==\"{1}\"", DynamicColumn, column)).Compile(); dictFunc[column] = func; } //猎取实体一切属性 Dictionary<string, PropertyInfo> PropertyInfoDict = new Dictionary<string, PropertyInfo>(); Type type = typeof(T); var propertyInfos = type.GetProperties(BindingFlags.Instance | BindingFlags.Public); //数值列 List<string> AllNumberField = new List<string>(); foreach (var item in propertyInfos) { PropertyInfoDict[item.Name] = item; if (item.PropertyType == typeof(int) || item.PropertyType == typeof(double) || item.PropertyType == typeof(float)) { AllNumberField.Add(item.Name); } } //分组 var dataGroup = list.GroupBy(string.Format("new ({0})", string.Join(",", DimensionList)), "new(it as Vm)") as IEnumerable<IGrouping<dynamic, dynamic>>; List<dynamic> listResult = new List<dynamic>(); IDictionary<string, object> itemObj = null; T vm2 = default(T); foreach (var group in dataGroup) { itemObj = new ExpandoObject(); var listVm = group.Select(e => e.Vm as T).ToList(); //维度列赋值 vm2 = listVm.FirstOrDefault(); foreach (var key in DimensionList) { itemObj[key] = PropertyInfoDict[key].GetValue(vm2); } foreach (var column in AllColumnList) { vm2 = listVm.FirstOrDefault(dictFunc[column]); if (vm2 != null) { foreach (string name in AllNumberField) { itemObj[name + column] = PropertyInfoDict[name].GetValue(vm2); } } } listResult.Add(itemObj); } return listResult; }
标红部份运用了System.Linq.Dynamic动态分组功用,传入字符串即可分组。运用了dynamic范例,关于dynamic引见能够参考别的文章引见哦。
System.Linq.Dynamic别的用法
上面行转列代码见地了System.Linq.Dynamic的壮大,下面再引见一下会在开辟中用到的要领。
Where过滤
list.Where("Name=@0", "张三")
上面用到了参数化查询,完成了查找姓名是张三的数据,经由过程这段代码你也许感觉不到它的优点。然则和EntityFramework结合起来就能够完成动态拼接SQL的功用了。
/// <summary> /// EF实体查询封装 /// </summary> /// <typeparam name="T">实体范例</typeparam> /// <param name="Query">IQueryable对象</param> /// <param name="gridParam">过滤前提</param> /// <returns>查询效果</returns> public static EFPaginationResult<T> PageQuery<T>(this IQueryable<T> Query, QueryCondition gridParam) { //查询前提 EFFilter filter = GetParameterSQL<T>(gridParam); var query = Query.Where(filter.Filter, filter.ListArgs.ToArray()); //查询效果 EFPaginationResult<T> result = new EFPaginationResult<T>(); if (gridParam.IsPagination) { int PageSize = gridParam.PageSize; int PageIndex = gridParam.PageIndex < 0 ? 0 : gridParam.PageIndex; //猎取排序信息 string sort = GetSort(gridParam, typeof(T).FullName); result.Data = query.OrderBy(sort).Skip(PageIndex * PageSize).Take(PageSize).ToList<T>(); if (gridParam.IsCalcTotal) { result.Total = query.Count(); result.TotalPage = Convert.ToInt32(Math.Ceiling(result.Total * 1.0 / PageSize)); } else { result.Total = result.Data.Count(); } } else { result.Data = query.ToList(); result.Total = result.Data.Count(); } return result; }
/// <summary> /// 经由过程查询前提,猎取参数化查询SQL /// </summary> /// <param name="gridParam">过滤前提</param> /// <returns>过滤前提字符</returns> private static EFFilter GetParameterSQL<T>(QueryCondition gridParam) { EFFilter result = new EFFilter(); //参数值鸠合 List<object> listArgs = new List<object>(); string filter = "1=1"; #region "处置惩罚动态过滤前提" if (gridParam.FilterList != null && gridParam.FilterList.Count > 0) { StringBuilder sb = new StringBuilder(); int paramCount = 0; DateTime dateTime; //操作符 string strOperator = string.Empty; foreach (var item in gridParam.FilterList) { //字段名称为空则跳过 if (string.IsNullOrEmpty(item.FieldName)) { continue; } //婚配罗列,防备SQL注入 Operator operatorEnum = (Operator)Enum.Parse(typeof(Operator), item.Operator, true); //跳过字段值为空的 if (operatorEnum != Operator.Null && operatorEnum != Operator.NotNull && string.IsNullOrEmpty(item.FieldValue)) { continue; } strOperator = operatorEnum.GetDescription(); if (item.IgnoreCase && !item.IsDateTime) { //2016-07-19增加查询时疏忽大小写比较 item.FieldValue = item.FieldValue.ToLower(); item.FieldName = string.Format("{0}.ToLower()", item.FieldName); } switch (operatorEnum) { //即是,不即是,小于,大于,小于即是,大于即是 case Operator.EQ: case Operator.NE: case Operator.GT: case Operator.GE: case Operator.LT: case Operator.LE: if (item.IsDateTime) { if (DateTime.TryParse(item.FieldValue, out dateTime)) { if (!item.FieldValue.Contains("00:00:00") && dateTime.ToString("HH:mm:ss") == "00:00:00") { if (operatorEnum == Operator.LE) { listArgs.Add(DateTime.Parse(dateTime.ToString("yyyy-MM-dd") + " 23:59:59")); } else { listArgs.Add(dateTime); } } else { listArgs.Add(dateTime); } sb.AppendFormat(" AND {0} {1} @{2}", item.FieldName, strOperator, paramCount); } } else { listArgs.Add(ConvertToType(item.FieldValue, GetPropType<T>(item.FieldName))); sb.AppendFormat(" AND {0} {1} @{2}", item.FieldName, strOperator, paramCount); } paramCount++; break; case Operator.Like: case Operator.NotLike: case Operator.LLike: case Operator.RLike: listArgs.Add(item.FieldValue); if (operatorEnum == Operator.Like) { sb.AppendFormat(" AND {0}.Contains(@{1})", item.FieldName, paramCount); } else if (operatorEnum == Operator.NotLike) { sb.AppendFormat(" AND !{0}.Contains(@{1})", item.FieldName, paramCount); } else if (operatorEnum == Operator.LLike) { sb.AppendFormat(" AND {0}.EndsWith(@{1})", item.FieldName, paramCount); } else if (operatorEnum == Operator.RLike) { sb.AppendFormat(" AND {0}.StartsWith(@{1})", item.FieldName, paramCount); } paramCount++; break; case Operator.Null: listArgs.Add(item.FieldValue); sb.AppendFormat(" AND {0}=null", item.FieldName); paramCount++; break; case Operator.NotNull: listArgs.Add(item.FieldValue); sb.AppendFormat(" AND {0}!=null", item.FieldName); paramCount++; break; case Operator.In: sb.AppendFormat(" AND ("); foreach (var schar in item.FieldValue.Split(',')) { listArgs.Add(schar); sb.AppendFormat("{0}=@{1} or ", item.FieldName, paramCount); paramCount++; } sb.Remove(sb.Length - 3, 3); sb.AppendFormat(" )"); break; case Operator.NotIn: sb.AppendFormat(" AND ("); foreach (var schar in item.FieldValue.Split(',')) { listArgs.Add(schar); sb.AppendFormat("{0}!=@{1} and ", item.FieldName, paramCount); paramCount++; } sb.Remove(sb.Length - 3, 3); sb.AppendFormat(" )"); break; } if (sb.ToString().Length > 0) { filter = sb.ToString().Substring(4, sb.Length - 4); } } #endregion } result.Filter = filter; result.ListArgs = listArgs; return result; }
总结
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