Nhibernate，需要帮助来修复我的选择查询

我是nhibernate的新手。我使用的是nhibernate 3.这是我需要做的，选择用户它的Id是1.如果该用户不存在，则返回null。Nhibernate，需要帮助来修复我的选择查询

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

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

我的选择查询没有。

这里是我得到的错误消息。

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 [email protected] ]\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 [email protected]]"} 
[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 [email protected] ]\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 [email protected]]"} 
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 [email protected] ]\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 [email protected]]" 
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（个）\ r \ n在NHibernate.Linq.NhQueryProvider.ExecuteQuery（NhLinqExpression nhLinqExpression，IQUERY查询，NhLinqExpression nhQuery个）\ r \ n在NHibernate.Linq.NhQueryProvider.Execute（表达式表达） \ r \ n在DevelopmentStack.Domain.Repositories上System.Linq.Queryable.FirstOrDefault [TSource]（IQueryable`1源）\ r \ n处的NHibernate.Linq.NhQueryProvider.Execute [TResult]（表达式表达式）\ r \ n C：\ code \ net \ DevelopmentStack \ DevelopmentStack.Domain \ Repositories \ Concrete \ NUserRepository.cs中的.Concrete.NUserRepository.AddUser（用户用户）：第30行“ TargetSite：{System.Collections.IList DoList（NHibernate.Engine。 ISessionImplementor，NHibernate.Engine.QueryParameters）} >

来源

2011-12-23 qinking126

这可能是由于User是保留关键字。如果你在hbm中映射它，确保你已经在表名中提供了转义：`用户（用户应该被“`由于降价而不能正确写入）”或[用户]。二者的区别在于第二个不关心方言。

来源

2011-12-23 15:58:48

尝试：

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

你应该总是使用GET而不是查询其ID检索实体时。如果实体不存在，则返回null。

来源

2011-12-23 16:00:42

Nhibernate，需要帮助来修复我的选择查询

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