我在 linq 中加入表时遇到问题,因为我正在检查templateSetId
模板集表中是否存在
询问:
select
vc.RowID, Choice_Text, VCE.[Goto]
from
ropes.Validation_Choices vc
left outer join
ropes.Validation_Condition_Expression VCE
on VCE.ChoiceID = vc.RowID and TemplateSetID in
(select RowID
from ropes.Validation_Templates_Set
where TemplateID = 66)
where
vc.QuestionID = 81
此查询返回 3 行。
移动 templatesetid 的过滤器给我一个错误“运算符'&&'不能应用于'int类型的操作数?' 和'bool'”我能做到的最好的就是这个
from tc in _context.ValidationChoice
join vce in _context.ValidationConditionExpression
on tc.ChoiceId equals (int)vce.ChoiceID into lfc
from lf in lfc.DefaultIfEmpty()
where tc.QuestionID == questionId &&
(from ts in _context.ValidationTemplateSet where ts.TemplateID == templateId select ts.TemplateSetId).Contains((int)lf.TemplateSetID)
select new TemplateChoiceDTO
{
ChoiceId = tc.ChoiceId,
ChoiceText = tc.ChoiceText,
NextQuestionId = lf.Goto
};
这相当于:
select vc.RowID,Choice_Text,VCE.[Goto] from ropes.Validation_Choices vc
left outer join ropes.Validation_Condition_Expression VCE on
VCE.ChoiceID = vc.RowID
where vc.QuestionID = 81
and TemplateSetID in (select RowID from ropes.Validation_Templates_Set where TemplateID = 66)
此查询返回 1 行,因为 templatesetid 的过滤器已移到外部