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例如查詢層次結構的數據,如果我有這樣的功能NHibernate - 從底部
id | parent_id
-----------------
1 | null
2 | 1
3 | 1
4 | 1
5 | 2
6 | 3
7 | 3
8 | 4
9 | 7
....
表層次樹看起來就像這樣:
X1
|
------------------------------------------------------
| | |
X2 X3 X4
| | |
| ------------------ |
| | | |
X5 X6 X7 X8
|
X9
那麼,有沒有反正,我可以使用QueryOver
或Criteria
查詢,當我輸入id
時,它會將所有parent_id
(或父對象)的列表從其父項返回到頂部?例如:
input | result
-----------------------
1 | null
2 | [1]
3 | [1]
5 | [2, 1]
8 | [4, 1]
9 | [7, 3, 1]
....
==================
工作查詢(但必須調用數據庫兩次)
var roleIds = session.CreateSQLQuery("SELECT Id FROM dbo.fn_get_parent_roles(:id)")
.SetInt32("id", roleId)
.List<int>();
Role x = null;
var query = session.QueryOver<Role>(() => x)
.Where(Restrictions.In("x.RoleId", roleIds.ToArray()));
= =================
更新時間:
var hierarchyQuery = new SQLCriterion(
new SqlString("{alias}.RoleId IN (SELECT Id FROM dbo.fn_get_parent_roles(:id))"),
new object[] { roleId },
new IType[] { NHibernateUtil.Int32 });
var results = session.QueryOver<Role>()
.Where(hierarchyQuery)
.List();
然後我得到這個消息:
Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
這裏充滿堆棧跟蹤
at System.ThrowHelper.ThrowArgumentOutOfRangeException()
at System.Collections.Generic.List`1.get_Item(Int32 index)
at NHibernate.Criterion.SQLCriterion.ToSqlString(ICriteria criteria, ICriteriaQuery criteriaQuery, IDictionary`2 enabledFilters)
at NHibernate.Loader.Criteria.CriteriaQueryTranslator.GetWhereCondition(IDictionary`2 enabledFilters)
at NHibernate.Loader.Criteria.CriteriaJoinWalker..ctor(IOuterJoinLoadable persister, CriteriaQueryTranslator translator, ISessionFactoryImplementor factory, ICriteria criteria, String rootEntityName, IDictionary`2 enabledFilters)
at NHibernate.Loader.Criteria.CriteriaLoader..ctor(IOuterJoinLoadable persister, ISessionFactoryImplementor factory, CriteriaImpl rootCriteria, String rootEntityName, IDictionary`2 enabledFilters)
at NHibernate.Impl.SessionImpl.List(CriteriaImpl criteria, IList results)
at NHibernate.Impl.CriteriaImpl.List(IList results)
at NHibernate.Impl.CriteriaImpl.List[T]()
at NHibernate.Criterion.QueryOver`1.List()
at NHibernate.Criterion.QueryOver`1.NHibernate.IQueryOver<TRoot>.List()
at At2ClaimBO.Src.Repositories.UserRepo.GetUsers(String searchStr, Int32 roleId, Int32 page) in D:\Arunsawad\At2ClaimBO\At2ClaimBO\Src\Repositories\UserRepo.cs:line 85
at At2ClaimBO.Src.Services.ClaimService.GetUsers(String searchStr, Int32 roleLevel, Int32 page) in D:\Arunsawad\At2ClaimBO\At2ClaimBO\Src\Services\ClaimService.cs:line 1326
at At2ClaimBO.Controllers.AdminController.SearchHead(String search_str, String role_id, Int32 page) in D:\Arunsawad\At2ClaimBO\At2ClaimBO\Controllers\AdminController.cs:line 259
at lambda_method(Closure , ControllerBase , Object[])
at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)
at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass42.<BeginInvokeSynchronousActionMethod>b__41()
at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.End()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass37.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49()
感謝您的快速回答:) – 2014-10-05 03:49:33
哦,我該如何將這個結果添加到QueryOver的Where子句中,我想要獲得具有該列表中從此函數返回的id的對象,我試過了Restrictions.In和子查詢但不是運氣:( – 2014-10-05 04:42:29
我想通了,但它發送了2個分離的調用數據庫,有無論如何,我可以將它們合併成一個電話? – 2014-10-05 06:29:00