entity synonym

Persistence is a higher-level abstraction on top of JDBC. The persistence layer maps an object to a database so that it does not need to use a cumbersome API like JDBC when querying, loading, updating, or deleting objects. In earlier versions of EJBS, persistence was part of the EJB platform. EJB3.0 started, persistence has been self-prescriptive, known as the Java Persistence API. The Java Persistence API defines a definition that maps regular generic Java objects (sometimes referred to as Pojo

Learning the Entity Framework technology during the review of excellent articles, for the sake of convenient access later, reproduced to the blog, can read the original: http://blog.csdn.net/bitfan/article/details/12887007The purpose of this article is to make an overall impression of the technology and understand its rationale before delving into the technology.I. Understanding the EF data ModelEF is essentially an ORM framework that needs to map obj

Turn from: http://www.cnblogs.com/huangcong/archive/2011/07/20/1931107.html in the previous text template (T4) experience we already know the usefulness of T4, Here's a look at how you can use it to implement bulk modification of the class name in the Entity Framework. We all know that there is one way in the ADO Entity Data model to generate a data model from a database model, which is a very simple way to

This section briefly introduces ObjectContext, ObjectQuery, ObjectStateEntry, Objectstatemanager, which are some of the more important classes in EF, They are located under the System.Data.Objects namespace under System.Data.Entity.dll. In subsequent chapters, we often use some of their methods in order to accomplish some of our operations or purposes. In this section, we will briefly explain the various classes of methods we may use in the future to facilitate our subsequent learning.ObjectCont

Entity Bean provides an object-oriented abstraction of relational databases, which can benefit from both object-oriented and process-oriented technologies. Since entity beans and session beans are both enterprise beans, they must have some similarities: entity beans must also have a home interface, bean interface, and Bean class, as shown in:

This article is a series of ASP. NET 4.0 and entity framework 4ArticleThe first article, this series will show you how to use entity framewok4 to Develop ASP. NETProgram. The article will teach you how to use entity framewok4 to create a database step by step. The created database will be used in later articles. Summary The released Visual Studio 2010 contain

In the old Entity Framework, developers can generate business entity models from existing databases. This development method is called database-driven development method. In the Entity Framework of 4.1, a developer is allowed to create an entity business class before generating related database files. This development

Entity objects have the following 4 states, which migrate by invoking the Entitymanager interface method: New state: The newly created entity object, which does not already have a persisted primary key, is not associated with a persistent context. Controlled state: A persistent primary key is already in place and the persistence context is established; Free State: Has a persisted primary key, but has not y

Label:Recently intended to write a database modeling article, so I intend to analyze Microsoft's official SQL Server sample database AdventureWorks, to see what is worth learning in this database. First we need to download the installation of a SQL Server database engine, and then download the sample database, where the author is sql2008r2, so the download is adventureworks2008r2,: http://msftdbprodsamples.codeplex.com/ You can see this database after you download the database and attach it to S

Learning Code First and entityframework in Entity Framework Reference page: Http://www.yuanjiaocheng.net/entity/dbcontext.html Http://www.yuanjiaocheng.net/entity/entitytypes.html Http://www.yuanjiaocheng.net/entity/entity-relations.html Http://www.yuanjiaocheng.net/

Database System Concepts Reading Notes-object-contact model preface in order to review the message system architecture I wrote, I need to re-read the first three chapters of database system concepts, here is a simple note to facilitate your own review of the basic concepts of the entity-contact (E-R) Data Model Based on such an understanding of the real world: the world is composed of a group of basic objects called entities and the relationships betw

Entity Framework 4.1/4.3 One (concept) Preface: Hello everyone, I want to die for you. Because I want to write an article on the Entity Framework series, I wrote the preface here. On the one hand, I want to talk about the starting point of my article series, and on the other hand, I want to talk about the writing ideas. I haven't published any articles in the blog garden for a long time, and most of the tim

Entity Framework basics, entityframeworkOverview Entity Framework (EF) is another product specifically implemented by Microsoft ORM. This blog will briefly introduce it. As for its deep-seated usage, You can query the corresponding operation manual. This article is only an entry point. Relationship between Entity Framework and Linq to SQL As we all know, Linq to

@ Common Properties Description:@Entity: Entity classes@Table: specifying the corresponding data table@Id: Primary key, using a nullable value type, if the entity class is not saved to the database is a temporary state@Column: Configure normal properties, except primary key, for Java base type properties@Base: How normal properties are loaded@GeneratedValue: Prim

Entitymanager is an auxiliary class that is used to manipulate entity beans. He can be used to generate/delete persisted entity beans, find entity beans by primary key, or find beans that satisfy a condition through the EJB3 QL language. When an entity bean is managed by Entitymanager, Entitymanager tracks his state ch

1. Use@Annotation Configuration entity ClassesEntity classes generally haveID, common attributes, set properties, and so on, corresponding to the primary key, ordinary column, foreign key of the database respectively. @in the annotation configuration, the entity class is@Entityannotations, using@Tablespecify the corresponding data table, using the@IdConfigure the primary key, using the@ColumnConfigure norma

Entity Framework Quick Start -- directly modify (brief introduction to objectcontext processing mechanism) Before introducing how the Entity Framework modifies an object to a database, let's briefly introduce the processing mechanism of objectcontext. 1. objectcontext Processing Mechanism Objectcontext is entityFramework encapsulates the context of database access and metadata information of ing relationshi

Before you have learned how to update data, in this section you will learn how to handle conflicts when multiple users update the same entity at the same time.Modify those pages related to the department entity so that they can handle concurrency errors. The following are the index and delete pages, and the error message when there is a concurrency violation.Concurrency ConflictsConcurrency conflicts occur

An ordinary Pojo class can be mapped to a persisted class by labeling @entity, and a persisted class can correspond to the data in the database. The mapping becomes an entity class to be dependent on some specific rules.1. Mapping entities (@Entity)The class labeled @entity annotation indicates that the class is a pers

Tip 13. An easy way to attach an entityProblem:In some earlier hints, we discussed using attach to load an unchanged (unchanged) state to ObjectContext to avoid the overhead of querying.If performance is your goal, attach is the weapon to choose from.Unfortunately our API does not fit into the case of 99%, where there is only one entity set for each type. The Entity Framework supports single-type multi-