many-to-many

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Entity Framework many to many relationship doesn't work

I have a problem with using EF 4.1 and many to many relationship. I decided to use database first approach (although I got the same problem with code first approach), and I created a model of the data[详细]

2023-04-10 06:28 分类：问答
Alternative for using Intersect operator in my sql query

I have 2 tables with many to many cardinality between them. So by normalization I have created this :[详细]

2023-04-09 22:14 分类：问答
Unable to iterate over ManyToMany - how do I calculate the sum?

My models look like this: class Article(models.Model): name = models.CharField(max_length=50) description = models.TextField()[详细]

2023-04-09 07:49 分类：问答
JPA Hibernate manyToMany with non-unique key

I have two entities (tables): Department and Person. Both tables have a field CODE which is not unique.[详细]

2023-04-09 06:14 分类：问答
How to update foreign key value in mysql database

I have three tables: categories, languages and categories_languages. Categories_languages is many to many table which links together categories and languages. I would like to update a foregin key valu[详细]

2023-04-08 17:33 分类：问答
cancan & many_to_many associations

I\'m trying to write a rule for man开发者_运维知识库y_to_many association. Because of the association table some results are duplicated.[详细]

2023-04-08 13:16 分类：问答
Find by intermediary attribute in a has_many :through in Rails [duplicate]

This question already has answers here: Closed 11 years ago. Possible Duplicate: Rails has_many :through Find by Extra Attributes in Join Model[详细]

2023-04-08 11:34 分类：问答
SQLAlchemy - How to map ManyToMany using autoloaded association tables

I am autoloading an MSSQL db.There a开发者_JS百科re a few ManyToMany assoc tables.I\'m not sure how to map each side.Here\'s a typical example of how they look in the db:[详细]

2023-04-08 09:18 分类：问答
Fluent NHibernate one-to-many with intervening join table?

I\'m having trouble getting the Fluent Nhibernate Automapper to create what I want.I have two entities, with a one-to-many relationship between them.[详细]

2023-04-07 12:52 分类：问答
Many-to-many messaging on local machine without broker

I\'m looking for a mechanism to use to create a simple many-to-many messaging system to allow Windows applications to communicate on a single machine but across sessions and desktops.[详细]

2023-04-07 08:40 分类：问答