我正在寻求使用EF6将以下SQL语句转换为LINQ的帮助。我似乎一直在研究不同的例子,但没有发现任何有效的例子。我看过linqer(没有成功(我看过linqpad(它不会将sql转换为linq(
下面的查询以SQL格式返回了我想要的内容,目标是基于内部分组返回表的所有列(将分组用作DISTINCT查询(,使用Group的WHERE子句将记录集筛选为所需内容,并在[CdrCallId]上加入内部分组仅返回[CdrCallId匹配的记录。
SELECT ct1.StartTime, ct1.CdrCallID, ct1.CallingNumberId, ct1.CalledNumberId, ct1.ThreadSequence
FROM CallTransactions as ct1
join (select CdrCallID
from CallTransactions as ct2
WHERE [StartTime] >= '10/1/2020 00:00:00 AM' AND [StartTime] <= '03/31/2021 00:00:00 AM' AND [CalledNumberId] = '1670589' OR [CallingNumberId] = '1670589' OR [DestinationNumberId] = '1670589' OR [TransferringNumberId] = '1670589' OR [KeyPartyNumberId] = '1670589'
group by ct2.CdrCallID) ct2
on ct1.CdrCallID = ct2.CdrCallID
开始时间 | CdrCallID | CallingNumberId调用的编号Id | 线程序列 |
---|---|---|---|
2020-11-02 12:49:34.007 | 995368-307-63751883929019 | 1670589 | 1658625995368|
2021-02-19 14:38:54.600 | 78900-050-63751893781085 | 1670589165862578900||
2020年10月27日09:58:15.007 | 704239-301-63751883392147 | 1663834 | 1667952704239|
2020年10月27日09:58:15.007 | 704239-301-63751883392147 | 1663834 | 1670589704239|
2020年10月27日09:57:14.007 | 704239-301-63751883392147 | 1663834 | 1667952704239|
2020年10月27日09:57:59.000 | 704239-301-63751883392147 | 16638341670589704239||
2020-11-02 10:15:06.007 | 497923-307-6375183688115 | 16638471670589497922
我认为您的SQL中有一些缺陷,实际上应该是这样的:
SELECT ct1.StartTime, ct1.CdrCallID, ct1.CallingNumberId, ct1.CalledNumberId, ct1.ThreadSequence
FROM CallTransactions as ct1
where exists
(select *
from CallTransactions as ct2
WHERE ct1.CdrCallID = ct2.CdrCallID and
(([StartTime] >= '20201001' AND [StartTime] <= '20210331') AND
([CalledNumberId] = '1670589' OR
[CallingNumberId] = '1670589' OR
[DestinationNumberId] = '1670589' OR
[TransferringNumberId] = '1670589' OR
[KeyPartyNumberId] = '1670589'));
在Linq,这将是:
var start = new DateTime(2020,10,1);
var end = new DateTime(2021,4,1);
var numberId = "1670589";
var callIDs = ctx.CallTransactions
.Where(x => x.StartTime >= start && x.StartTime < end &&
(x.CalledNumberId == numberId ||
x.CallingNumberId == numberId ||
x.DestinationNumberId == numberId ||
x.TransferringNumberId == numberId ||
x.KeyPartNumberId == numberId))
.Select(x => x.CdrCallId);
var result = ctx.CallTransactions.Where(x => callIDs.Any(ci => ci.CdrCallId == x.CdrCallId)
.Select(ct1 => new {ct1.StartTime, ct1.CdrCallID, ct1.CallingNumberId, ct1.CalledNumberId, ct1.ThreadSequence});
附言:你真的不需要把所有东西都转换成EF Linq。您也可以从Linq调用原始SQL。
IQueryable<CallTransactions> items;
var start=new DateTime(2021,1,10);
var due=new DateTime(2021,3,31);
var result=items.Where(a=>a.StartTime>=start && a.StartTime<=due)
.Where(a=>a.CalledNumberId = '1670589' ||
a.CallingNumberId = 1670589 ||
a.DestinationNumberId = 1670589 ||
a.TransferringNumberId = 1670589 ||
a.KeyPartyNumberId = '1670589')
.Select(a=>new {
a.StartTime,
a.CdrCallID,
a.CallingNumberId,
a.CalledNumberId,
a.ThreadSequence
});
我认为这不需要联接,一旦过滤了集合,就可以获得所有必需的行。