C# 交叉应用LINQ-TO-SQL
有以下表格:C# 交叉应用LINQ-TO-SQL,c#,linq,linq-to-sql,C#,Linq,Linq To Sql,有以下表格: create table Table_A ( Id int primary key identity, Status int not null ) create table Table_B ( Id int primary key identity, Value varchar(80) not null ) create table Table_C ( Id int primary key identity, Time datet
create table Table_A (
Id int primary key identity,
Status int not null
)
create table Table_B (
Id int primary key identity,
Value varchar(80) not null
)
create table Table_C (
Id int primary key identity,
Time datetime not null
)
我想使用lambda表示法在LINQ to SQL中编写以下查询:
select * from TABLE_A a
cross apply (
select top 1 c.Time from TABLE_B b
inner join TABLE_C c on c.Id = b.Id
where b.Id = a.Id
order by c.Time asc
) d
where a.Status = 10 and d.Time > '2021-03-09'
我该怎么做呢?不确定LinqToSql如何翻译它,但是像
EF-Core
和linq2db
这样的现代LINQ提供者应该将这个LINQ查询翻译成交叉应用
var date = new DateTime(2021, 03, 09);
var query =
from a in db.TABLE_A
from d in (
from b in db.TABLE_B
join c in db.TABLE_C on b.Id equals c.Id
where b.Id = a.Id
orderby c.Time
select new { b, c }
).Taske(1)
where a.Status == 10 && d.Time > date
select new { a, d.b, d.c };
EF Core 5不再像这样翻译它了。它转换为ROW_NUMBER()(在LinqPad中运行良好(并产生交叉应用)的所有查询上的分区和超时。好吧,这是优化。在这种情况下可能是错误的。