one-to-one

问题 If have an entity A with a bidirectional one-or-zero-to-one mapping with entity B. The mapping is as follows: <class name="EntityA" table="TABLE_A" mutable="true" lazy="true"> <id name="idA" type="long" column="pk_a" unsaved-value="null"> <generator class="sequence"> <param name="sequence">pk_a_seq</param> </generator> </id> <one-to-one name="propertyB" class="EntityB" property-ref="propertyA" constrained="true" outer-join="false"/> </class> and <class name="EntityB" table="TABLE_B" mutable=

问题 I have a Book model and Inventory model mapped by ISBN number, but ISBN is not the primary key in either. Books belong to Bookstores and Inventory is for a group of Bookstores(BookstoreChain). Inventory is shared by all Bookstores belonging to a BookstoreChain. I'm using Hibernate @OneToOne mapping on the book side to fetch inventory info by joining the ISBN column. Somehow, Hibernate generates the left outer join query correctly, but inventory is null on the Book object. Its not lazy loaded

问题 I have a one-to-one relationship using PrimaryKeyJoinColumn annotated on the parent side. And now I want to save the child entity by itself. For example, I have Employee and EmpInfo as the child entity, I need to save EmpInfo (of course after setting the id property of the parent to it). However, when such an arrangement is used, I get an exception listed below... org.springframework.dao.InvalidDataAccessApiUsageException: detached entity passed to persist Any ideas why hibernate does not

问题 I belive that the answer to my problem is simple, but I can't find it anywhere. Here is my predicament. I have two models: Member and MemberDetail, which are in oneToOne relation like this: class Member(models.Model): ID = models.AutoField(primary_key=True) FIRST_NAME = models.CharField('First name', max_length=50) LAST_NAME = models.CharField('Last name', max_length=50) def __unicode__(self): return u'%s %s' % (self.FIRST_NAME, self.LAST_NAME) class MemberDetail(models.Model): member =

问题 I have a one-to-one relation like this The Parent @JsonAutoDetect @Entity @Table(name = "Parent") public class Parent{ private Integer id; private Child child; @Id @GeneratedValue(strategy= GenerationType.AUTO) @Column (name="idparent") public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } @OneToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "parent") @JoinColumn(name="idchild", nullable=true) public Child getChild() { return child; } public

问题 Having read JPA 2.0 / Hibernate and "orphanRemoval": Just replacing an entity does not remove the old one, and the related ticket https://hibernate.atlassian.net/browse/HHH-6484, I inferred that this had been (finally) fixed in version 4.2.7 and 4.3.0.CR1. However, trying ... entityManager.getTransaction().begin(); Point point = entityManager.find(Point.class, pointId); point.setPost(null); entityManager.getTransaction().commit(); ... where public class Point { ... @OneToOne(cascade =

问题 I have an existing database with the table Transactions in it. I have added a new table called TransactionSequence where each transaction will ultimately have only one record. We are using the sequence table to count transactions for a given account. I have mapped this as a one-to-one mapping where TransactionSequence has a primary key of TransactionId. The constraint is that there is an instead of trigger on the transaction table does not allow updates of cancelled or posted transactions. So

问题 I have looked up and down, tried all the different and various ways of being able to store a foreign key of the AspNetUser table in a separate Customer table. I'm still new at ASP.NET and the Entity Framework, but I've read quite a few posts and documentations. Currently this is what I have MODELS public class Customer { [Display (Name="Customer ID")] public int CustomerID { get; set; } public string UserId { get; set; } [ForeignKey("UserId")] public virtual ApplicationUser ApplicationUser {

问题 I am in the process of updating the existing *.hbm.xml files into fluent ClassMaps and have stumbled on a mistake in our mapping files, and I don't know the default behavior for me to map this correctly. The mapping file has: <one-to-one name="LineItemAssembly" class="LineItemAssembly" cascade="all-delete-orphan" /> When using Fluent, I would expect this to map to: HasOne<LineItemAssembly>(x => x.LineItemAssembly) .Cascade.AllDeleteOrphan(); However, AllDeleteOrphan() is not an option off of

问题 I have the below two classes: public class Project { public virtual int ProjectId { get; set; } public virtual string ProjectName { get; set; } public virtual LegalEntity LegalEntity { get; set; } } and public class LegalEntity { public virtual int LegalEntId { get; set; } public virtual string Name { get; set; } } with mappings as: <class name="Project" table="Project" dynamic-update="true"> <id name="ProjectId"> <generator class="native"/> </id> <property name="ProjectName" /> <many-to-one