Question

休斯顿我们有一个问题...不，我猜它只是我。：）

我正在尝试在NHibernate QueryOver对象上执行子查询。没有SubQueries的查询工作正常，但是当添加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);

继续获得此例外：

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google了，向下和横向搜索右操作数应该是detachedQueryInstance 和其他查询以及没有运气。希望有人在这里知道什么是错的，以及如何在将来解决这些问题。

我也没试过这个问题：

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();

Answer 1

我尝试通过QueryOver查询时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ContainerUser行都被AccountStatus删除。

所以在QueryOver中你可以这样写：

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.

NHibernate QueryOver WithSubQuery WhereAll子句

1 个答案: