Nhibernate, нужна помощь для исправления моего запроса на выбор

Question

Я новичок в nhibernate. тот, который я использую, - это nhibernate 3. вот что мне нужно сделать, выберите пользователя, его идентификатор равен 1. Если этот пользователь не существует, верните его обратно.

var selectedUser = session.Query(). Где (u => u.Id == 1) .FirstOrDefault();

   if (selectedUser == null) 
       { 
        userID = (int)session.Save(user); 
       } 

мой запрос выбора нет.

вот сообщение об ошибке, которое я получил.

could not execute query\r\n[ select TOP (@p0) user0_.Id as Id0_, user0_.Username as Username0_, user0_.Password as Password0_, user0_.CreateDate as CreateDate0_, user0_.Avatar as Avatar0_, user0_.AccountTypeId as AccountT6_0_, user0_.FirstName as FirstName0_, user0_.LastName as LastName0_, user0_.MiddleName as MiddleName0_, user0_.Email as Email0_, user0_.OtherId as OtherId0_ from [User] user0_ where user0_.Id=@p1 ]\r\n Name:p1 - Value:1\r\n[SQL: select TOP (@p0) user0_.Id as Id0_, user0_.Username as Username0_, user0_.Password as Password0_, user0_.CreateDate as CreateDate0_, user0_.Avatar as Avatar0_, user0_.AccountTypeId as AccountT6_0_, user0_.FirstName as FirstName0_, user0_.LastName as LastName0_, user0_.MiddleName as MiddleName0_, user0_.Email as Email0_, user0_.OtherId as OtherId0_ from [User] user0_ where user0_.Id=@p1]"} 
[NHibernate.Exceptions.GenericADOException]: {"could not execute query\r\n[ select TOP (@p0) user0_.Id as Id0_, user0_.Username as Username0_, user0_.Password as Password0_, user0_.CreateDate as CreateDate0_, user0_.Avatar as Avatar0_, user0_.AccountTypeId as AccountT6_0_, user0_.FirstName as FirstName0_, user0_.LastName as LastName0_, user0_.MiddleName as MiddleName0_, user0_.Email as Email0_, user0_.OtherId as OtherId0_ from [User] user0_ where user0_.Id=@p1 ]\r\n Name:p1 - Value:1\r\n[SQL: select TOP (@p0) user0_.Id as Id0_, user0_.Username as Username0_, user0_.Password as Password0_, user0_.CreateDate as CreateDate0_, user0_.Avatar as Avatar0_, user0_.AccountTypeId as AccountT6_0_, user0_.FirstName as FirstName0_, user0_.LastName as LastName0_, user0_.MiddleName as MiddleName0_, user0_.Email as Email0_, user0_.OtherId as OtherId0_ from [User] user0_ where user0_.Id=@p1]"} 
Data: {System.Collections.ListDictionaryInternal} 
HelpLink: null 
InnerException: {"Invalid object name 'User'."} 
Message: "could not execute query\r\n[ select TOP (@p0) user0_.Id as Id0_, user0_.Username as Username0_, user0_.Password as Password0_, user0_.CreateDate as CreateDate0_, user0_.Avatar as Avatar0_, user0_.AccountTypeId as AccountT6_0_, user0_.FirstName as FirstName0_, user0_.LastName as LastName0_, user0_.MiddleName as MiddleName0_, user0_.Email as Email0_, user0_.OtherId as OtherId0_ from [User] user0_ where user0_.Id=@p1 ]\r\n Name:p1 - Value:1\r\n[SQL: select TOP (@p0) user0_.Id as Id0_, user0_.Username as Username0_, user0_.Password as Password0_, user0_.CreateDate as CreateDate0_, user0_.Avatar as Avatar0_, user0_.AccountTypeId as AccountT6_0_, user0_.FirstName as FirstName0_, user0_.LastName as LastName0_, user0_.MiddleName as MiddleName0_, user0_.Email as Email0_, user0_.OtherId as OtherId0_ from [User] user0_ where user0_.Id=@p1]" 
Source: "NHibernate" 
StackTrace: " at NHibernate.Loader.Loader.DoList(ISessionImplementor session, QueryParameters queryParameters)\r\n at NHibernate.Loader.Loader.ListIgnoreQueryCache(ISessionImplementor session, QueryParameters queryParameters)\r\n at NHibernate.Loader.Loader.List(ISessionImplementor session, QueryParameters queryParameters, ISet`1 querySpaces, IType[] resultTypes)\r\n at NHibernate.Hql.Ast.ANTLR.Loader.QueryLoader.List(ISessionImplementor session, QueryParameters queryParameters)\r\n at NHibernate.Hql.Ast.ANTLR.QueryTranslatorImpl.List(ISessionImplementor session, QueryParameters queryParameters)\r\n at NHibernate.Engine.Query.HQLQueryPlan.PerformList(QueryParameters queryParameters, ISessionImplementor session, IList results)\r\n at NHibernate.Impl.SessionImpl.List(IQueryExpression queryExpression, QueryParameters queryParameters, IList results)\r\n at NHibernate.Impl.AbstractSessionImpl.List(IQueryExpression queryExpression, QueryParameters parameters)\r\n at NHibernate.Impl.ExpressionQu 

eryImpl.List() \ г \ п на NHibernate.Linq.NhQueryProvider.ExecuteQuery (NhLinqExpression nhLinqExpression, IQuery запроса, NhLinqExpression nhQuery) \ г \ п на NHibernate.Linq.NhQueryProvider.Execute (выражение Выражение) \ r \ n в NHibernate.Linq.NhQueryProvider.Execute [TResult] (выражение выражения) \ r \ n в System.Linq.Queryable.FirstOrDefault [TSource] (источник IQueryable'1) \ r \ n в DevelopmentStack.Domain.Repositories .Concrete.NUserRepository.AddUser (Пользователь пользователя) в C: \ code \ net \ DevelopmentStack \ DevelopmentStack.Domain \ Repositories \ Concrete \ NUserRepository.cs: строка 30 " TargetSite: {System.Collections.IList DoList (NHibernate.Engine. ISessionImplementor, NHibernate.Engine.QueryParameters)} >

Answer 1

Возможно, это связано с тем, что Пользователь является зарезервированным ключевым словом. Если вы сопоставили его в hbm, убедитесь, что вы указали escapes в имени таблицы: «Пользователь (пользователь должен быть окружен« Я не могу правильно писать из-за уценки) или [Пользователь]. Разница между ними состоит в том, что второй не заботится о диалекте.

Answer 2

Try:

var selectedUser = session.Get<User>(1); 

Вы должны всегда использовать Получить вместо запроса при получении примитива его ID. Если объект не существует, то null будет возвращен.