Entity framework code first unique constraint fluent api

  • Entity Framework 6 (EF6) is a tried and tested object-relational mapper for .NET with many years of feature development and stabilization.
@rowanmiller Maybe the question was not clear. I know how to create relations and foreign keys but my question was about giving a custom name for the foreign key column. For example, the sample code below:

Sep 24, 2014 · In this approach the Entity Framework does not leverage any kind of configuration file (.edmx file) to store the database schema, because the mapping API uses these conventions to generate the database schema dynamically at runtime. Currently, the Entity Framework Code First approach does not support mapping to Stored Procedures.

Sep 29, 2010 · By default Code First will map inheritance hierarchies to a single table using the TPH pattern, you can tweak the default TPH mapping or swap to TPT or TPC using the Fluent API. The API calls to achieve the various mappings in CTP4 are pretty verbose and not very discoverable… but it will be better in the next release… stay tuned
  • I'm trying to build an EF Entity with Code First, and an EntityTypeConfiguration using fluent API. creating primary keys is easy but not so with a Unique Constraint. I was seeing old posts that suggested executing native SQL commands for this, but that seem to defeat the purpose. is this possible with EF6?
  • Entity Framework 6 Code First 实践系列(1):实体类配置总结 EF实体类的配置可以使用数据注释或Fluent API两种方式配置,Fluent API配置的关键在于搞清实体类的依赖关系,按此方法配置,快速高效合理。
  • Entity Framework Code-First provides a set of DataAnnotation attributes, which you can apply to your domain classes and properties. DataAnnotation attributes override default Code-First conventions. System.ComponentModel.DataAnnotations includes attributes that impacts on nullability or size of the column.

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    Sep 14, 2016 · Use HiLo to generate keys with Entity Framework Core. To begin with, a little info about HiLo Pattern. HiLo is a pattern where the primary key is made of 2 parts “Hi” and “Lo”. Where the “Hi” part comes from database and “Lo” part is generated in memory to create unique value. Remember, “Lo” is a range number like 0-100.

    Entity Framework 6 (EF6) is a tried and tested object-relational mapper for .NET with many years of feature development and stabilization.

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    Oct 01, 2015 · One of the most significant function of Data Annotation and Fluent API is configuring the entity classes. The Code First uses the annotation from the System.ComponentModel.DataAnnotations assembly. These features have be discussed in the “ Entity Framework: Convention “. If you are interested in these, please check it out.

    Apr 11, 2011 · Entity Framework Code First – Specify foreign key name in one to many relationship with fluent API April 18, 2011 agilenet 1 comment This post shows how to create a one to many relationship and define the foreign key name.

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    Sep 29, 2010 · By default Code First will map inheritance hierarchies to a single table using the TPH pattern, you can tweak the default TPH mapping or swap to TPT or TPC using the Fluent API. The API calls to achieve the various mappings in CTP4 are pretty verbose and not very discoverable… but it will be better in the next release… stay tuned

    Entity Framework itself supports this scenario, but Code First does not. Code First requires at least one navigation property to create a relationship. If you remove both navigation properties, Code First will just treat the foreign key property as any other property in the class and will not create a foreign key constraint in the database.

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    Entity Framework Core is the .NET Core version of Microsoft’s flagship product that was first released in 2008. In the beginning, it was part of .NET 3.5 SP1 and as such it was licensed to be used for free, but no source code was available.

    So, when the client issues a request to OData service, the Web API OData framework will map the request to an action in the OData controller. Such mapping is based on pre-registered Routes in global configuration.

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    Fluent API is a flexible way to define mapping between POCO classes used in EF Code first. This mapping eventually results in proper definition of DB Constraints when EF generates the DB Schema. Since database mapping code is separate from the POCO classes, these classes need not be changed by applying Data Annotation Attributes.

    Key Constraints¶ When using the Entity Framework with the BrightstarDB back-end, entities with key properties are treated as having a “class-unique key constraint”. This means that it is not allowed to create an RDF resource with the same URI identifier and the same RDF type.

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    EntityFramewok Fluent API is a powerful and elegant way of mapping your code-first domain models to underlying database. This also can be used with code-first with existing database.

    Feb 28, 2017 · How To: Entity Framework Core relationships, composite keys, foreign keys, data annotations, Code First and Fluent API

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    Глава 1. Введение в Entity Framework 6. Что такое Entity Framework; Первое приложение. Подход Code First; Глава 2. Взаимодействие с данными. Подходы. Code First к существующей базе данных; Соглашения по наименованию в ...

    La Fluent API. La seconde méthode a été nommée "Fluent API". Elle a été créée pour que ça soit encore une fois la production de code qui permette de décrire le modèle. La Fluent API est beaucoup plus avancée en termes de fonctionnalités et vous permet d’utiliser les outils les plus optimisés de votre base de données.

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Jun 28, 2009 · Entity Framework needs a unique constraint to work nicely, and this makes sense. It means that I cannot have two entries where the same article is linked with the same category. If such a constraint were not put in place, EF will make the table read-only.
Jun 02, 2015 · Code First approach was introduced with Entity Framework 4.1. With code first, you can start building your classes based on your business requirement first and entity framework will take care of creating the databases and tables. (If you don't want your databases to be automatically created, you can turn off this feature). Why Code First ?
Aug 30, 2015 · The server side of the application is up and running and CRUD operations function with an MVC 6 application using Entity Framework code first with SQLite. A simple angular client application has been created to test the CRUD operations.