icriteria

问题 Here's my (simplified) model: Ticket -> Customer Callback (s) I have my Ticket mapped so that when it's loaded, the Callbacks are as well. base.HasMany<TechSupportCallback>(x => x.Callbacks) .KeyColumn(Fields.TRACKED_ITEM_ID) .Not.LazyLoad() .Inverse() .Cache.ReadWrite(); This is not lazy loading because otherwise I'll get 'no session to load entities' when the web service tries to serialize (and load) the proxy. (Using repositories to fetch data.) It's also bi-directional .. (in the

问题 I want to do something like this... return GetSession() .ToPagedList<Employee>(page, pageSize, x=> x.SetFetchMode(DomainModelHelper.GetAssociationEntityNameAsPlural<Team>(), FetchMode.Eager)); But I don't know how to pass this Func<ICriteria,ICriteria> into the ISession or ICriteria . I have a standard paging extension method and this extension method shall have an overload where I can pass additional ICriteria methods, so that I can additionally set up the FetchMode or something else.

问题 I'm using NHibernate to query my database with the criteria API. My criteria is below: ICriteria c = Session.CreateCriteria(typeof(Transaction)); ProjectionList projections = Projections.ProjectionList(); projections.Add(Projections.Sum("Units"), "Units"); projections.Add(Projections.GroupProperty("Account"), "Account"); projections.Add(Projections.GroupProperty("Security"), "Security"); c.SetProjection(projections); This is working fine, but what I would like is a way to be able to limit the

问题 hi i am new in NHibernate and i am a little confused. Suppose we have a product table. Let the product table have 2 columns price1 and price2. then i may query mapped product entities via HQL as follows: string queryString = @"from product p where p.price1 = p.price2 + 100 "; IList result = session.CreateQuery(queryString).List(); How can i achieve that via ICriteria API. i know it's absurd but i am trying sth like that: session.CreateCriteria(typeof(product)) .Add(Expression.Eq("price1",

问题 In NHibernate you can easily benefit from first level cache when using Load or Get methods. But what about ICriteria , HQL , Linq-to-NHibernate and QueryOver ? Do they use first level cache too? 回答1: They use it for returning entities, but the queries go straight to the db unless you use the second level cache. Consider this: var fooUsingGet = session.Get<Foo>(fooId); var fooQueryById = session.Query<Foo>().Single(f => f.Id == fooId); Two queries are executed (one for the Get, one for the

问题 I want to create a query which has more than 3-4 Expression.Or ? But Expression.Or just let me to add two Expressions inside it. if (!string.IsNullOrEmpty(keyword)) query .Add(Expression.Or( Expression.Like("Name", keyword, MatchMode.Anywhere), Expression.Like("LastName", keyword, MatchMode.Anywhere))) .Add(Expression.Or( Expression.Like("Email1", keyword, MatchMode.Anywhere), Expression.Like("Email2", keyword, MatchMode.Anywhere))); The code above generates "Name like %this% or LastName like

问题 Can I use a Criteria to execute a t-sql command to select the max value for a column in a table? 'select @cus_id = max(id) + 1 from customers' Ta Ollie 回答1: Use Projection: session.CreateCriteria(typeof(Customer)) .SetProjection( Projections.Max("Id") ) . UniqueResult(); 回答2: Max(id) + 1 is a very bad way to generate ids. If that's your goal, find another way to generate ids. Edit: in answer to LnDCobra: it's bad because it's hard to make sure that the max(id) you got is still the max(id)

问题 Can I select a random row using NHibernate's ICriteria API? 回答1: Just as cundh2o said, it's DBMS-specific. But you can subclass the Order class and define your own custom ordering. For example, for SQL Server: public class RandomOrder: Order { public RandomOrder() : base("", true) {} public override SqlString ToSqlString(ICriteria criteria, ICriteriaQuery criteriaQuery) { return new SqlString("newid()"); } } 回答2: If you are not limited to using ICriteria, I might recommend using HQL instead

问题 I am trying to query against an IList<string> property on one of my domain classes using NHibernate. Here is a simple example to demonstrate: public class Demo { public Demo() { this.Tags = new List<string>(); } public virtual int Id { get; set; } public virtual string Name { get; set; } public virtual IList<string> Tags { get; set; } } Mapped like this: <class name="Demo"> <id name="Id" /> <property name="Name" /> <bag name="Tags"> <key column="DemoId"/> <element column="Tag" type="String" /

问题 I have an entity that is like this public class Customer { public Customer() { Addresses = new List<Address>(); } public int CustomerId { get; set; } public string Name { get; set; } public IList<Address> Addresses { get; set; } } And I am trying to query it using the Criteria API like this. ICriteria query = m_CustomerRepository.Query() .CreateAlias("Address", "a", NHibernate.SqlCommand.JoinType.LeftOuterJoin); var result = query .SetProjection(Projections.Distinct( Projections