one-to-many

相关标签：javascript jquery android 多少钱 iPhone

workaround/get rid of multiple writable mappings in OneToMany and ManyToOne relationship?

i\'ve been trying to solve a problem but got stuck now. I have 2 entity classes/tables Order and OrderItem. OrderItem has 1 Order and Order has 1..* OrderItems.[详细]

2023-03-15 20:26 分类：问答
callbacks on active record associations

I have a vacation approval model that has_many :entries is there a way that if I destroy one of those entries to have the rest destroyed? I also want to send one email if they are, but not one for eac[详细]

2023-03-14 20:17 分类：问答
How to map one-to-many collection with join table using discriminator

I\'m trying to implement a basic tagging system with hibernate. The problem is that everyone has been subclassing Tag to make the mapping easier. I want to keep my Tag object agnostic to how it\'s use[详细]

2023-03-14 13:46 分类：问答
Modeling a one-to-many relationship in Core Data for iOS

I have two entities: patient and checkpoint. Patient has attributes such as DOB, n开发者_如何学JAVAame, ID, etc.[详细]

2023-03-13 19:17 分类：问答
Merging related data when a column should become unique

Given a mysql-database with tables as follows: author: +----+----------+ id | name| +----+----------+ 1| John|[详细]

2023-03-13 07:58 分类：问答
Create Temporary Table Where CONCAT GROUPS are placed into their own columns?

I\'m a bit of a MYsql newbie and I\'m stumped as to how to do this.I think I have to insert my results into a TEMPORARY TABLE, but I\'m not sure.[详细]

2023-03-13 06:54 分类：问答
Doctrine/Symfony - Multiple one-to-many relations on same Model

Here is an extract of the schema I actually have Software: columns: title: type: string(255) id_publisher:[详细]

2023-03-12 08:29 分类：问答
Using field values from joined query as columns

I have two MySQL tables describing data that can be extended into subclasses, one that describes the parent class data and another one describing metadata fields as one-to-many relationships.[详细]

2023-03-11 21:36 分类：问答
Traversing one-to-many relationships with NSFetchedResultsControllers

I am creating an app that navigates through multiple levels of one-to-many relationships. So for example, pretend that the CoreDataBooks code sample starts with a list of genres, you click on a genre[详细]

2023-03-11 11:01 分类：问答
Linq to SQL using IQueryable API for 1 to many relationship

Assume A is a parent table with many B records.Essentially I need LINQ to S开发者_运维问答QL to generate this query:[详细]

2023-03-09 01:37 分类：问答