hibernate-mapping

问题 I am working on the project which is based on hibernate and spring. I have spent two days but can't figure out why the "lazy exception" error is coming when i call this piece of code: public MemberUser SendEmail(MemberUser user) throws MailSendingException { // Check if password will be sent by mail // Hibernate.initialize(user); user = fetchService.fetch(user, FETCH); // user = userDao.load(user.getId(), FETCH); final MemberGroup group = user.getMember().getMemberGroup(); final boolean

问题 I'm trying to persist my data but am having trouble coming up with a schema that will work for hibernate in a sane way I have two objects: a channel and user. The user is associated with the channel but in many ways. It can have 5 special statuses (and can be assigned multiple ones) or be normal. The issue is complicated by the fact that its a many to many relationship (a user can be in multiple channels and a channel has multiple users). My idea is to have separate channel and user tables

问题 Hi i have Department entity ,In that department entity I have property's called department name In string datatype and another property parentdepartment as department datatype(Class Type) as the foreign key to that column.And I have used one-to -one relation ship and cascade type is orphan-delete.If delete My parent department I don't want to delete child department for that reason I have used orphan-delete here but it is giving an exception as following. Exception SEVERE: Cannot delete or

问题 Hi i have Department entity ,In that department entity I have property's called department name In string datatype and another property parentdepartment as department datatype(Class Type) as the foreign key to that column.And I have used one-to -one relation ship and cascade type is orphan-delete.If delete My parent department I don't want to delete child department for that reason I have used orphan-delete here but it is giving an exception as following. Exception SEVERE: Cannot delete or

问题 I have this schema: --------------- -------------------- ---------------- | Customers | | CustomRoutePrice | | Route | |-------------| |------------------| ---------------| | CustId (pk) | | CustId (pk) | | RouteId (pk) | | Desc | | RouteId (pk) | | Desc | --------------- | Price | | Price | -------------------- ---------------- and I want to map the CustomRoutePrice 's Price to my Customer s POJO, saying something like: Map<Route, Double> customRoutesPrices; or maybe having a new POJO called

问题 I am trying to delete a child record when parent is deleted. There is no column in the parent table that refers to child. The child refers to parent in a one-to-one optional relationship. When parent is being deleted, a constraint is thrown due to the fact relationship still exists. If I add the set relationship to the child side, it does not help. Hibernate does not delete the child record since I am guessing, child record was never fetched. Is there a way to delete child records short of

问题 I am trying to write a stock management system. But now I have a few question. Please help me to sort out these problems. I have 2 entities. Item and ItemPrice . Item has one or more ItemPrice When I try to save Item object, it works fine; but when I try to retrieve details from database, it gives following Exception stack trace. org.hibernate.HibernateException: Found shared references to a collection: com.pos.entities.ItemGroup.items Hibernate: select itemmodel0_.id as id9_, itemmodel0_

问题 fluent NHibernate: many-to-many relationship with Product to Product.how i can implement it on asp.net mvc public class Product { public virtual int Id { get; set; } public virtual IList<Product> ManyProduct { get; set; } } Mapping public class ProductMap : ClassMap<Product> { public ProductMap() { Id(x => x.Id); Map(x => x.ImageUrl); } HasManyToMany(x => x.ManyProduct) .Cascade.All() .Table("ProductInProduct"); } 回答1: You don't specifically say what is wrong but your HasManyToMany definition

问题 I have the following class diagram and I want to map it to a database (note that Person has a list with objects of class Vehicle). Also my database looks like: All tables in the database that represent a subclass of the Vehicle class have all the fields of the superclass Vehicle. Also, all the relations show a one-to-many relationship from Person to Vehicle, Car and Motorcycle. My hibernate mapping files are the following: Person.hbm.xml <hibernate-mapping package="...."> <class name="Person"

问题 I have the following class diagram and I want to map it to a database (note that Person has a list with objects of class Vehicle). Also my database looks like: All tables in the database that represent a subclass of the Vehicle class have all the fields of the superclass Vehicle. Also, all the relations show a one-to-many relationship from Person to Vehicle, Car and Motorcycle. My hibernate mapping files are the following: Person.hbm.xml <hibernate-mapping package="...."> <class name="Person"