foreign-keys

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Symfony: Loading fixtures of objects with multiple column primary key which are also foreign keys

im writing fixtures for my project in symfony, and i have preblems when trying to add fixtures to objects with a multiple column primary key, which is also foreign key to other table.[详细]

2023-04-02 01:28 分类：问答
How do I remove a datatable from a dataset (has a bunch of relationships)

I am attempting to remove a datatable that was loaded into a dataset, and has been related. Here is the code I attempted.[详细]

2023-04-01 21:09 分类：问答
Something like reference counting or shared pointers for database rows?

First of all, I am using Postgres 9.1. I have a table named filepaths and other tables that have rows that point to the id of their corresponding filepaths.Is there a common design approach for refer[详细]

2023-04-01 18:12 分类：问答
postgresql vs mysql in ease of scaling, and usefulness for highly relational (tons of foreign keys) databases

OK, I\'ve read quite a few things about PostgresSQL and it seems to have a few features which seem pretty awesome, I really like the idea of being able to update a table and adding a column/index with[详细]

2023-03-31 20:13 分类：问答
Django: Save Modelform with Foreignkey using to_field and ModelChoiceForm

I have a problem saving a ModelForm when using a foreign key that doesn\'t \"point\" to the primary key of it\'s related table (legacy schema woes) I am using to_field= for my Foregin Key so that it w[详细]

2023-03-31 19:19 分类：问答
MySQL foreign keys on self

I\'m currently trying to make a self referencing table in MySQL, however it seems I can\'t make a foreign key on the table itself, I\'m getting an MySQL error:[详细]

2023-03-31 17:25 分类：问答
How do I store data that is shared between databases?

How do I store data that is shared between databases? Suppose a database for a contact management system. Each user is given a separate database. User can store his/her contacts\' education informati[详细]

2023-03-31 11:31 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
Foreign Keys Changing Based on a Field

In SQL (specifically mysql) consider a case when I have a table with a enumeration (name, relation) called type and an int called idtype.[详细]

2023-03-31 07:20 分类：问答
save data from form with custom foreign key field in django

I have the following Model classes: class ContactPerson(models.Model): name = models.CharField(max_length=30)[详细]

2023-03-31 01:29 分类：问答