one-to-one

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Django: find all OneToOneFields pointing to a Model

I\'m writing routines to inspect an instance and find all its relations (e.g. using instance._meta.get_all_related_objects()) but I can\'t find a way to get relations involving a OneToOneFie开发者_如何[详细]

2023-02-17 18:01 分类：问答
JPA problem one-to-one association cascade= PERSIST

I have this ER model Message 0..1 <--> 0..1 MessageDetail PK:ID_MESSAGEPK: ID_DETA开发者_Python百科IL[详细]

2023-02-16 23:40 分类：问答
Copying 1-to-1 relationships with identity fields in SQL

Suppose you have two tables that are in a one-to-one relationship; i.e. the primary key of the child table is also the foreign key that links it to the parent table. Suppose also that the primary key[详细]

2023-02-15 11:32 分类：问答
Mutual foo.bar and bar.foo attributes in django Models with onetooneviews

I have two classes, Foo and Bar, in a Django app (on AppEngine if that matters). There\'s a one to one relationship between them.[详细]

2023-02-14 03:39 分类：问答
Hibernate one-to-one mapping between 2 subclasses

How can I make an one-to-one relationship between 2 subclasses wh开发者_JAVA百科en they do not have the ID property? Because each of them was inherited the Id property from superclass so I cannot put[详细]

2023-02-13 06:14 分类：问答
Composition mapping in Hibernate using annotation?

how can I define a data model (including 2 classes A and B, B is contained in A) that satisfy the B\'s id is the same with A\'s id (because I want to make 开发者_开发百科an one-to-one relationship bet[详细]

2023-02-12 11:31 分类：问答
Hibernate error: one-to-one mapping on superclass and subclass

I\'m working on a project with Hibernate and MySQL, use annotation for mapping database to data object model. I need to mapping one-to-one between superclass and subclass on ID primary key of their cl[详细]

2023-02-12 02:15 分类：问答
Is it possible to map a superclass and subclass by OneToOne relationship in Hibernate?

Is it possible to map a subclas开发者_开发知识库s to its superclass by OneToOne relationship base on their primary key properties in Hibernate? How can I implement this?You can do it with the JOINED i[详细]

2023-02-11 22:46 分类：问答
PHP Sending mass mails: One for each or one for all?

When sending mass mails with PHP, is it better to send each subscriber an e-mail (running 开发者_运维技巧a for loop through all the e-mail addresses) or is it better to just add all in BCC in a comma[详细]

2023-02-10 22:36 分类：问答
@OneToOne + Table-per-Concrete-Class = exception?

I\'m new to Hibernate, and I can\'t get @OneToOne to function in our code. After much reading, I\'ve constructed an isolates example, and thought to ask the help of the community.[详细]

2023-02-10 09:46 分类：问答