entity-relationship

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Fetching entities with relations in Core Data

I have 2 entities in my Core Data database Person and Photo a Person has a To-Many relationship with Photo and Photo has a reverse relationship with Person (Person<-->>Photo). I load some ini[详细]

2023-03-18 20:39 分类：问答
Using Entity Framework with historical data

I\'m building a windows application in .Net 4.0 to create and organize electronics projects.The main purpose of the application is to record the vendor information for the electronics components (part[详细]

2023-03-18 16:44 分类：问答
EF4 - Force order of execution

I have three tables - Context, Session and User. And below are their simplified structure. User: UserId (Int, PK)[详细]

2023-03-18 03:03 分类：问答
How to generate an entity-relationship (ER) diagram using Oracle SQL Developer

I want to use Oracle SQL Developer to generate an ER diagram for my DB tables but I am new to Oracle and this tool.[详细]

2023-03-17 20:58 分类：问答
Add an Object to Entity Framework using a navigational property

Hi I use C# and EF 4. I have two Entities CmsContent and CmsJob. CmsJob has a navigational property to CmsContent.[详细]

2023-03-17 19:52 分类：问答
Entity Framework - Read Lock on Record

I\'m calling same database from different applications using Entity Framework. However, when one application is reading/updating a record, I do not want other applications to read that data.[详细]

2023-03-17 19:43 分类：问答
ER/Data modelling (Link between inherited types

Would it be possible (or is it illegal for any reason) to have something like this: This is basically an ISA class with a foreign-key relationship to itself.[详细]

2023-03-17 16:42 分类：问答
Google App Engine datastore - how to save a one-to-one relationship

I am having trouble understanding how the entity groups and relationships work with GAE using JDO. The scenario I run is basically:[详细]

2023-03-17 04:17 分类：问答
problem of cascade delete in entity framework

According to cascade deleting, i wrote below codes but there is an error : An error occurred while updating the entries. See the inner exception for details.[详细]

2023-03-15 04:27 分类：问答
owned and unowned relationships

What exactly is meant by owned and unowned relationships? These terms are often used in JPA/JDO documentation, but I haven\'t found a good definition of th开发者_运维技巧em.In addition to Nix\'s anwse[详细]

2023-03-13 23:08 分类：问答