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Entity Framework (EF) is an open source [2] object–relational mapping (ORM) framework for ADO.NET. It was originally shipped as an integral part of .NET Framework, however starting with Entity Framework version 6.0 it has been delivered separately from the .NET Framework. Entity Framework 6.4 was the latest release of the classic framework.
For example, consider an address book entry that represents a single person along with zero or more phone numbers and zero or more addresses. This could be modeled in an object-oriented implementation by a "Person object " with an attribute/field to hold each data item that the entry comprises: the person's name, a list of phone numbers, and a ...
Entity Framework, included in .NET Framework 3.5 SP1 and above; iBATIS, free open source, maintained by ASF but now inactive. LINQ to SQL, included in .NET Framework 3.5; NHibernate, open source; nHydrate, open source; Quick Objects, free or commercial
In the earlier years of .NET development, a number of third-party object–relational libraries emerged in order to fill some perceived gaps in the framework. [32] [33] [34] As the framework evolved, additional object–relational tools were added, such as the Entity Framework and LINQ to SQL, both introduced in .NET Framework 3.5. These tools ...
ORMLite: Lightweight object–relational mapping (ORM) framework in Java for JDBC and Android [6] Microsoft Entity Framework; DBIx::Class object–relational mapping (ORM) module for Perl; TuxORM: Simple object–relational mapping (ORM) library in Java for JDBC; Persist (Java tool) Java-based object–relational mapping and data access object tool
An entity, strictly speaking, is an instance of a given entity-type. There are usually many instances of an entity-type. Because the term entity-type is somewhat cumbersome, most people tend to use the term entity as a synonym. Entities can be thought of as nouns. [7] Examples include a computer, an employee, a song, or a mathematical theorem.
For example, a physics system may query for entities having mass, velocity and position components, and iterate over the results doing physics calculations on the set of components for each entity. The behavior of an entity can be changed at runtime by systems that add, remove or modify components.
Example of an IDEF1X entity–relationship diagrams used to model IDEF1X itself. The name of the view is mm. The domain hierarchy and constraints are also given. The constraints are expressed as sentences in the formal theory of the meta model. [8] There are several notations for data modeling.