composite-primary-key

Over-quote problem with ruby, activerecord and composite_primary_keys on oracle

I am getting an Oracle error because of the SQL being generated for an association between tables.There is no开发者_C百科 compound primary key involved, but this problem did not occur before adding th[详细]

2023-04-06 01:13 分类：问答

One to many problem mapping when target entity has composite primary key but source not

I have a use case where a user got some profiles: So a one-to-many association. This is mapped through these legacy tables in pseudo sql.[详细]

2023-04-02 12:11 分类：问答

Rails ORM, can it cope with a compound Primary key of two foreign keys referencing the same table?

Edited 30th, 03:16, to show improved migration and model I have a table of elements that can each be connected to many other elements.Is it possible to do this in Rails\' migrations and models?(the f[详细]

2023-03-31 07:35 分类：问答

Entity Framework - an object with a composite primary key

I\'m using Entity Framework 4 and I\'ve recently changed one of the objects\' primary key to contain 2 columns instead of 1 (it used to have only its id - Guid - and now it has an id and a version - i[详细]

2023-03-31 02:07 分类：问答

How to select a complex/composite key in C# using combo-boxes?

I have a problem with C#.NET (Visual Studio 2010). I have 2 datatables in SQL2005 express : Building which its primary key is \"building number\",[详细]

2023-03-24 00:23 分类：问答

sql - one column foreign key to two column primary key [duplicate]

This question already has answers here: Closed 11 years a开发者_如何学Gogo. Possible Duplicate: Can a foreign key reference a non-unique index?[详细]

2023-03-15 20:09 分类：问答

Hibernate second-level cache composite-id

I am trying to cache an object in Hibernate\'s second level cache that has a composite-id mapped in my persistence-mapping file.The logs say that the first time I run the query, the class mapped as th[详细]

2023-03-13 18:14 分类：问答

How to define composite keys in MS Access?

I am new to MS Access. Could anybody tell me how to define a composite primary k开发者_如何学编程ey in MS Access 2007.If memory serves correctly, you can hold SHIFT while selecting the fields in the d[详细]

2023-03-12 21:46 分类：问答

Hibernate Composite primary key contains foreign key which is subset of other tables primary key, how to map?

The scenario is as follows Table A has a composite PK. Table A --------a1 (pk)开发者_JS百科 a2 (pk) a3 (pk) foo bar LastUpdateDate LastUpdateUser[详细]

2023-03-10 07:19 分类：问答

Hibernate HBM2DDL produces nullable field for primary foreign key?

I\'m using hbm2ddl (from the hibernate3-maven-plugin 2.2) to produce a DDL based on my JPA annotated entities. Normally, this works fine but I recently introduced an entity that uses a composite key m[详细]

2023-03-09 16:14 分类：问答