many-to-one

问题 User have n Contacts. A Contact can have a localized Comment (Comments are shared between Contacts). Java Beans: @Audited @Entity public class User { @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval = true) Set<Context> contacts; } @Audited @Entity public class Contact { @ManyToOne(fetch = FetchType.EAGER, cascade = { CascadeType.MERGE, CascadeType.PERSIST, CascadeType.REFRESH}) Comment comment; } @Audited @Entity public class Comment { String de; String en; String

问题 I am new to Hibernate. I notice that in Hibernate, mapping the java classes into database tables often involve relation tables, even sometimes relation tables are not necessary(Like in a one-to-many relation or the opposite). For example: I am a Company class and a Flight class, in which a company can have many flights(a one to many association from Company to Flight). I have the following code using hibernate annotations: @Entity @Table(name = "COMPANY") public class Company { @Id private

问题 I'm using Hibernate 3.6.7-Final and Spring 3.0.5. I have entity like this @Entity public class Foo { @ManyToOne private Bar bar; } @Entity public class Bar { @Column String group; } How can I use @Filter in Foo where I want to get all Foo 's that have Bar with group = :group ? This is supposed to be a security constraint. Tryied just setting @Filter(name = "groupFilter", condition = "group = :group") at the attribute bar from Foo but it didn't work. Does hibernate have support for this or

问题 I have 2 entities. I would like to delete row of Service. I tried: $em = $this->getDoctrine()->getEntityManager(); $service = $em->getRepository('AppBundle:Service')->find(1); $em->remove($service); $em->flush(); On this way it deleted all of the row, which containing this category id. Sry for my bad English. Let me explain you on the other way: BEFORE AFTER delete id 1 from service +----+------+ +----+------+-----+ +----+------+ +----+------+-----+ + id + ca_ + + id + se_ + ca_ + + id + ca_

问题 Hibernate optional @ManyToOne relationship still fetches the Parent in a separate select optional=true and fetch=FetchType.Lazy Child @ManyToOne //may not exist @JoinColumns({ @JoinColumn(name="parent_key1", insertable=false, updatable=false), @JoinColumn(name="parent_key2", insertable=false, updatable=false) }) Parent parent Note, that I can have a value for parent_key1 , parent_key2 columns existing in Child table but a corresponding Parent need not exist with this key, that's why the

问题 I've started to study Django yesterday and I'm having some trouble with to creating a Many to One Relation based on objects I've previously created. models.py # -*- coding: utf-8 -*- from django.db import models class Item(models.Model): code = models.AutoField(primary_key=True) name = models.CharField(max_length=150, unique=True) class Meta: ordering = ('name', 'code') def __unicode__(self): return self.name class Product(models.Model): code = models.AutoField(primary_key=True) name = models

问题 If I've, in a single entity A, multiple relations (many to one) towards an entity B (annotated with one to many)? Do I've to put an annotation for each occurrence of A in B? Example: Entity A: @Entity @Table(name = "patient") @TableGenerator(name = "tab_gen_pa", initialValue = 30000, allocationSize = 1) public class Patient implements Serializable, Comparable<Patient> { @ManyToOne @Column(name = "birth_region") private Region birthRegion; @ManyToOne @Column(name = "birth_province", length = 2

问题 I am frequently associating a vote entity in other ones with symfony2 / doctrine 2. This is done through a manyToOne relationship. I was considering using a trait to include the association and its getters/setters in other entities but then I faced the issue that the mappedBy parameter couldn't be replaced correctly. If there is no way to give arguments to a trait, how else could I achieve my objective, knowing I can't extend another class. Example : /** * @ORM\OneToMany(targetEntity="

问题 These two questions answered many of my questions, but I am still struggling to think about in real scenario! Taking an example from the references. Assume I have one Order and Multiple Items associated with it. Now assume One Item can have one Returns but one Returns can have multiple Items. What I understood is, Order to Items will be One to Many Relation . Since I need to get Order of an Item, I will create column 'order_fk' in Item table to get it. //Order entity @OneToMany @JoinColumn

问题 how to overwrite a one to many records in odoo through odoo API ? This is my create json, what change I want to make in this json to overwrite(Replace) the existing? lead_product_ids ., now it is appending the records. Now i am getting multiple when update the records in this code instead of 0,0 what is the value, Please help. { "jsonrpc": "2.0", "params": { "model": "crm.lead", "method": "create", "args": [ { "type": "opportunity", "name": "Fgtrdhjkkmmmmmmmm1290", "pro_info": "Fggggggg