1、SqlSugar.cs

SqlSugar作为一款.NET老牌ORM 并且也是 新手基数比较多的ORM。

2、SQL实现报表

1. Sql可以很方便的创建临时表并且关联

2.Sql语法事先行转列，列转行等一系列的操作

3、实例

1、正常写法

 1 var days = (time.AddMonths(1) - time).Days;//获取1月天数
 2 var dayArray = Enumerable.Range(1, days).Select(it=> time.ToString("yyyy-MM-"+it)).ToList();//转成时间数组
 3 var queryableLeft = db.Reportable(dayArray).ToQueryable<DateTime>();
 4 var queryableRight = db.Queryable<operateinfo>();
 5 var list = db.Queryable(queryableLeft, queryableRight, JoinType.Left,
 6     (x1, x2) => x1.ColumnName.Date==x2.operate_time.Date)
 7     .GroupBy((x1, x2) => x1.ColumnName)
 8     .Select((x1, x2) => new
 9     {
10         count = SqlFunc.AggregateSum(SqlFunc.IIF(x2.id > 0, 1, 0)),
11         day = x1.ColumnName.Day
12  
13     }).ToList();

 

 

 

 2、实现行转列

 

 1 var days = (time.AddMonths(1) - time).Days;//获取1月天数
 2 var dayArray = Enumerable.Range(1, days).Select(it=> time.ToString("yyyy-MM-"+it)).ToList();//转成时间数组
 3 var queryableLeft = db.Reportable(dayArray).ToQueryable<DateTime>();
 4 var queryableRight = db.Queryable<operateinfo>();
 5 var list = db.Queryable(queryableLeft, queryableRight, JoinType.Left,
 6     (x1, x2) => x1.ColumnName.Date==x2.operate_time.Date)
 7     .GroupBy((x1, x2) => x1.ColumnName)
 8     .Select((x1, x2) => new
 9     {
10         count = SqlFunc.AggregateSum(SqlFunc.IIF(x2.id > 0, 1, 0)),
11         day = x1.ColumnName.Day,
12         name="合计"
13  
14     }).ToPivotTable(it => it.day, it => it.name, it => it.Sum(x => x.count));

 

 

 

 

文章出处：用 .SqlSugar ORM 来实现报表功能 .NET CORE /.NET - 果糖大数据科技 - 博客园 (cnblogs.com)