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休斯顿我们有一个问题......不，我想它只是我。:)

我正在尝试对 NHibernate QueryOver 对象进行子查询。没有 SubQueries 的查询可以正常工作，但是当添加一个 SubQuery 时，一切都会崩溃。

EDIT1：
我想要完成的是选择所有与容器的关系都将 AccountStatus 属性设置为 DELETED 的用户 

var queryOver = session.QueryOver<User>();

queryOver.WhereRestrictionOn(x => x.UserHasContainer).IsNotEmpty
         .JoinQueryOver<ContainerUser>(x => x.UserHasContainer)
         .WithSubquery.WhereAll(x => x.AccountStatus == AccountStatus.DELETED);

不断收到此异常：

System.Exception: right operand should be detachedQueryInstance.As<T>() - "DELETED"
at NHibernate.Impl.ExpressionProcessor.FindDetachedCriteria(Expression expression)
at NHibernate.Impl.ExpressionProcessor.ProcessSubqueryExpression(LambdaSubqueryType subqueryType, BinaryExpression be)
at NHibernate.Impl.ExpressionProcessor.ProcessSubquery[T](LambdaSubqueryType subqueryType, Expression`1 expression)
at NHibernate.Criterion.Subqueries.WhereAll[T](Expression`1 expression)
at RBAC.Infrastructure.DataAccess.QueryObject.Implementation.UserQueryObject.FilterByContainerRelationsAreScheduledForDeletion(IQueryOver`2 queryOver) in c:\APPL\dev\RBAC\Dev\RBAC.Infrastructure\DataAccess\QueryObject\Implementation\UserQueryObject.cs:line 113
at RBAC.Infrastructure.DataAccess.QueryObject.Implementation.UserQueryObject._ExecuteQuery(IQueryOver`2 queryOver) in c:\APPL\dev\RBAC\Dev\RBAC.Infrastructure\DataAccess\QueryObject\Implementation\UserQueryObject.cs:line 101
at RBAC.Infrastructure.DataAccess.QueryObject.Base.BaseQueryObject`1.ExecuteQuery(ISessionDecorater session) in c:\APPL\dev\RBAC\Dev\RBAC.Infrastructure\DataAccess\QueryObject\Base\BaseQueryObject.cs:line 20
at RBAC.Infrastructure.DataAccess.GenericDAO.Implementation.GenericDAO.GetByQueryObject[T](IQueryObject`1 queryObject) in c:\APPL\dev\RBAC\Dev\RBAC.Infrastructure\DataAccess\GenericDAO\Implementation\GenericDAO.cs:line 253
at RBAC.Infrastructure.BusinessService.CleanupModule.Implementation.RBACCleanerActions.CleanUpUsers() in c:\APPL\dev\RBAC\Dev\RBAC.Infrastructure\BusinessService\CleanupModule\Implementation\RBACCleanerActions.cs:line 59

我已经向上、向下和横向搜索了正确的操作数应该是 detachedQueryInstance和其他查询，但没有运气。希望这里有人知道出了什么问题，以及将来如何解决这些问题。

我也试过这个查询，但没有运气：

queryOver.WhereRestrictionOn(x => x.UserHasContainer).IsNotEmpty
         .JoinQueryOver<ContainerUser>(x => x.UserHasContainer)
         .Where(Subqueries.WhereAll<ContainerUser>(x => x.AccountStatus == AccountStatus.DELETED));

例外：

System.InvalidCastException: Unable to cast object of type 'System.Linq.Expressions.PropertyExpression' to type 'System.Linq.Expressions.BinaryExpression'.
at NHibernate.Impl.ExpressionProcessor.ProcessSubquery[T](LambdaSubqueryType subqueryType, Expression`1 expression)
at NHibernate.Criterion.Subqueries.WhereAll[T](Expression`1 expression)
at RBAC.Infrastructure.DataAccess.QueryObject.Implementation.UserQueryObject.FilterByUsersWereAllTheirFunctionRelationsAreScheduledForDeletion(IQueryOver`2 queryOver) in c:\APPL\dev\RBAC\Dev\RBAC.Infrastructure\DataAccess\QueryObject\Implementation\UserQueryObject.cs:line 157
at RBAC.Infrastructure.DataAccess.QueryObject.Implementation.UserQueryObject._ExecuteQuery(IQueryOver`2 queryOver) in c:\APPL\dev\RBAC\Dev\RBAC.Infrastructure\DataAccess\QueryObject\Implementation\UserQueryObject.cs:line 97
at RBAC.Infrastructure.DataAccess.QueryObject.Base.BaseQueryObject`1.ExecuteQuery(ISessionDecorater session) in c:\APPL\dev\RBAC\Dev\RBAC.Infrastructure\DataAccess\QueryObject\Base\BaseQueryObject.cs:line 21
at RBAC.Infrastructure.DataAccess.GenericDAO.Implementation.GenericDAO.GetByQueryObject[T](IQueryObject`1 queryObject) in c:\APPL\dev\RBAC\Dev\RBAC.Infrastructure\DataAccess\GenericDAO\Implementation\GenericDAO.cs:line 253
at RBAC.Infrastructure.BusinessService.ADModule.Implementation.DeletionFlagSetter.FlagUsersForDeletionWereAllRelationsAreFlaggedForDeletionForADRegisteredUsers() in c:\APPL\dev\RBAC\Dev\RBAC.Infrastructure\BusinessService\ADModule\Implementation\DeletionFlagSetter.cs:line 115
at RBAC.Infrastructure.BusinessService.ADModule.Implementation.ActiveDirectorySynchronizer.Synchronize() in c:\APPL\dev\RBAC\Dev\RBAC.Infrastructure\BusinessService\ADModule\Implementation\ActiveDirectorySynchronizer.cs:line 156

EDIT2：
如果我有一个用户列表，我认为 linq 中的等价物就是这个。

users.Where(x => x.UserHasFunctions.All(y => y.IsDeleted)).ToList();
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1 回答 1

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在尝试处理 QueryOver 查询时，我通常采取的第一步是提出正确的 SQL。根据您的 LINQ 查询，我认为这看起来像这样：

select
    User.*
from
    User
where
    /* Or whatever "deleted" turns out to be, not necessarily '1' */
    1 = all (select AccountStatus          
             from ContainerUser
             where ContainerUser.UserId = User.Id);

基本上让所有用户的所有ContainerUser行都AccountStatus被删除。

所以在 QueryOver 你可以这样写：

User userAlias = null;

session.QueryOver<User>(() => userAlias)
    .WithSubquery.WhereValue(AccountStatus.DELETED).EqAll(QueryOver.Of<ContainerUser>()
        .Where(uc => uc.User.Id == userAlias.Id)
        .Select(uc => uc.AccountStatus));

// select list, more restrictions, etc.
于 2013-06-27T12:48:27.423 回答