c# – NHibernate生成带有错误连接的SQL

问题似乎来自于在where子句中使用左连接表中的可空int列.这导致联接像内部联接一样运行.

var list = this.WorkflowDiaryManager.WorkflowActionRepository.All
    .Fetch(x => x.CaseView)
    .Fetch(x => x.WorkflowActionType)
    .ThenFetchMany(x => x.WorkflowActionPriorityList)
    .Where(x => x.AssignedUser.Id == userId || x.CaseView.MooseUserId == userId)

由此产生的SQL看起来像(从加入开始 – 您不需要查看所有选择)

from Kctc.WorkflowAction workflowac0_ 
left outer join Kctc.WorkflowCaseView workflowca1_ on workflowac0_.CaseId=workflowca1_.CaseId 
left outer join Kctc.WorkflowActionType workflowac2_ on workflowac0_.WorkflowActionTypeId=workflowac2_.WorkflowActionTypeId 
left outer join Kctc.WorkflowActionPriority workflowac3_ on workflowac2_.WorkflowActionTypeId=workflowac3_.WorkflowActionTypeId,Kctc.WorkflowCaseView workflowca4_ 
where workflowac0_.CaseId=workflowca4_.CaseId 
and (workflowac0_.AssignedUser=@p0 or workflowca4_.[MooseUserId]=@p1);
@p0 = 1087 [Type: Int32 (0)],@p1 = 1087 [Type: Int32 (0)]

因此导致问题的部分是上面代码片段的第5行.正如您所看到的,NHibernate正在尝试在WorkflowCaseView View上进行“老派”连接.这会导致查询排除WorkflowAction表中没有CaseId的其他有效操作.

任何人都可以解释为什么NHibernate正在编写这个SQL,以及我如何鼓励它产生更好的查询？

谢谢！

WorkflowActionMap中的重要位

Table("Kctc.WorkflowAction");
        Id(x => x.Id).GeneratedBy.Identity().Column("WorkflowActionId");
        References(x => x.WorkflowActionType).Column("WorkflowActionTypeId").Unique();
        References(x => x.CompletedBy).Column("CompletedBy");
        References(x => x.CaseView).Column("CaseId").Not.Update().Unique();
        References(x => x.AssignedUser).Column("AssignedUser");

WorkflowCaseViewMap的重要部分

Table("Kctc.WorkflowCaseView");
        Id(x => x.Id).Column("CaseId");
        Map(x => x.MooseUserId).Nullable();

看着这个,我想知道我是否应该让HasMany回到另一个方向……

编辑.似乎没有帮助