relation

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Compute canonical cover using armstrong's axioms

question:Determine the canonical cover using Armstrong’s Axioms.Give the axioms that you use to arrive at each step.[详细]

2023-02-27 03:56 分类：问答
symfony many to many in embedded form

I have a problem with embbed form from Model which has many to many relation. The embedded form will save the model correctly but will not save many to many relations.[详细]

2023-02-20 03:05 分类：问答
category<->product relations

I have this prob开发者_JAVA技巧lem with magento 1.4.1.1, when I delete a product it won\'t decrease the amount of products in the category tree view. I found out that magento is not deleting the entry[详细]

2023-02-20 02:49 分类：问答
association data in rails model scope

I have a model named Post (blog post) and a model named Category. Each post belongs_to a category. Each category has an attribute named retainer that specifies the amount of time before a post \"expir[详细]

2023-02-20 00:24 分类：问答
Optimal databasesystem for filters

I am building a website that implements filters that can be applied to a dataset. Allow me to explain these filters. In this case it will be a website with houses.[详细]

2023-02-15 15:05 分类：问答
YAML Mapping exception on Doctrine 2

I created my database and tables using phpMyAdmin. I setup the relations there aswell. I then wanted to get Doctrine 2 to create the YAML files for me by do this command:[详细]

2023-02-14 23:07 分类：问答
linq to entity save

I have a following database structure. I have already saved Buyer in database. I have buyer id. I have to save contact information of a buyer in the database, as I save contact in the database I al[详细]

2023-02-14 08:28 分类：问答
Display bidirectional and composition relation UML class diagram

I have two classes Event and Review. The event has an instance object Review in it. A review also has an object Event in it.[详细]

2023-02-14 06:26 分类：问答
MySQL relations for country region and town tables

I am trying to figure out the best method to relate country, region and town tables. On my website I want the user to be able to just enter a town. Then optionally country and region, both of which wi[详细]

2023-02-12 04:52 分类：问答
Django: How to edit a gallery that is attached to a project model?

I have a \'project\' model. Each project has a \'gallery\' and each gallery has \'photos\'. class Project:[详细]

2023-02-06 06:14 分类：问答