[英]NHibernate: LINQ to NHibernate self join
我正在嘗試使用LINQ to NHibernate實現以下SQL語句:
SELECT a.JOB_ID ID FROM SERVICE_DATA a WHERE STEP_ID = x and (STATUS = 'Success' or STATUS = 'Skipped')
AND a.JOB_ID not in (SELECT JOB_ID FROM SERVICE_DATA WHERE JOB_ID = a.JOB_ID AND STATUS = 'Error')
AND a.JOB_ID not in (SELECT JOB_ID FROM SERVICE_DATA WHERE STEP_ID = y and (STATUS = 'Success' or STATUS = 'Skipped' or STATUS = 'Error'));
目前,我可以使用以下命令選擇所有需要第一個NOT IN自我加入條件的條件:
DetachedCriteria secondSubCriteria = DetachedCriteria.For<ServiceData>()
.SetProjection(Projections.Property("JobId"))
.Add(Restrictions.Eq("StepId", stepId))
.Add(Restrictions.Disjunction()
.Add(Restrictions.Eq("Status", "Success"))
.Add(Restrictions.Eq("Status", "Skipped"))
.Add(Restrictions.Eq("Status", "Error")));
var data = session.CreateCriteria<ServiceData>()
.Add(Restrictions.Eq("StepId", stepId))
.Add(Restrictions.Disjunction()
.Add(Restrictions.Eq("Status", "Success"))
.Add(Restrictions.Eq("Status", "Skipped")))
//.Add(Subqueries.PropertyNotIn("JobId", ???))
.Add(Subqueries.PropertyNotIn("JobId", secondSubCriteria))
.List<ServiceData>()
.Take(1)
.FirstOrDefault();
我如何基於列JOB_ID獲得自我聯接以在示例中的第一個子條件上工作?
經過嘗試后,我自己找到了答案,對於有相同問題的任何人,請在Criteria()構造函數中指定表別名,並在其他查詢中對此進行引用。
DetachedCriteria firstSubCriteria = DetachedCriteria.For<ServiceData>("x")
.SetProjection(Projections.Property("x.JobId"))
.Add(Restrictions.EqProperty("x.JobId", "s.JobId"))
.Add(Restrictions.Not(Restrictions.Eq("x.Status", "Error")));
DetachedCriteria secondSubCriteria = DetachedCriteria.For<ServiceData>()
.SetProjection(Projections.Property("JobId"))
.Add(Restrictions.Eq("StepId", stepId))
.Add(Restrictions.Disjunction()
.Add(Restrictions.Eq("Status", "Success"))
.Add(Restrictions.Eq("Status", "Skipped"))
.Add(Restrictions.Eq("Status", "Error")));
var data = session.CreateCriteria<ServiceData>("s")
.Add(Restrictions.Eq("StepId", stepId))
.Add(Restrictions.Disjunction()
.Add(Restrictions.Eq("s.Status", "Success"))
.Add(Restrictions.Eq("s.Status", "Skipped")))
.Add(Subqueries.PropertyNotIn("s.JobId", firstSubCriteria))
.Add(Subqueries.PropertyNotIn("s.JobId", secondSubCriteria))
.List<ServiceData>()
.Take(1)
.FirstOrDefault();
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.