The basic characteristics and design principles of the UJO ORM framework
The basic characteristics and design principles of the UJO ORM framework
Introduction:
The UJO ORM framework is an Object-Relational Mapping (ORM) framework, which aims to simplify the conversion of developers in the relationship database and object.This framework has many unique characteristics and design principles, which can greatly improve development efficiency and flexibility.
Basic Features:
1. Simple and easy -to -use: UJO ORM framework provides a set of simple and easy -to -use APIs by simplifying and abstract underlying database operations, so that developers can easily perform CRUD (creation, read, update, delete) operation without paying attentionComplex SQL statements and database details.
2. Highly customized: UJO ORM framework allows developers to customize and expand according to actual needs.By using annotations or XML configurations, the relationship between objects and tables can be flexibly mapped, and high -level operations such as querying sentences, joint queries, and paginations can be supported.
3. High performance: The UJO ORM framework uses some performance optimization strategies, such as pre -compiling SQL statements, batch operations, cache mechanisms, etc. to improve data access performance.In addition, the UJO ORM framework realizes the cache of object -level and database levels, reducing frequent visits to the database, thereby improving the overall performance of the system.
4. Cross -database support: The UJO ORM framework has good cross -database support, which can adapt to different types of relational databases, such as MySQL, Oracle, SQL Server, etc.Developers can switch the database as needed instead of a large number of modifications and adjustments.
Design Principles:
1. Simple: UJO ORM Framework follows the principle of "agreed better than configuration", and simplifies the development process by providing the default mapping rules and agreement.Developers only need to name them according to specifications to save the tedious configuration process.
2. High -end and low coupling: The UJO ORM framework advocates separate data access logic from business logic, and adopts object -oriented programming ideas to achieve high -end and low -coupled design.By providing persistent interfaces and physical classes, developers can focus on object operations in business logic, and to be decoupled with the specific database.
3. Transparency: One of the design goals of the UJO ORM framework is to maintain the transparency of the underlying database as much as possible.Developers can use object -oriented methods for programming without having to care about the compilation of specific database types and SQL statements.
4. Scalability: The UJO ORM framework provides a wealth of expansion mechanism, so that developers can perform functional extensions and improvements as needed.By customized annotations, plug -in mechanisms, it can meet the needs of specific applications, so that the framework has higher flexibility and scalability.
Example code and configuration:
The following is an example code using the UJO ORM framework:
@Entity
@Table(name = "user")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
@Column(name = "username")
private String username;
// Getters and Setters
}
@Repository
public class UserRepository {
@Autowired
private EntityManager entityManager;
public User findById(int id) {
return entityManager.find(User.class, id);
}
public void save(User user) {
entityManager.persist(user);
}
}
@Service
public class UserService {
@Autowired
private UserRepository userRepository;
public User getUserById(int id) {
return userRepository.findById(id);
}
public void saveUser(User user) {
userRepository.save(user);
}
}
By using@Entity,@Table,@ID, and @column, developers can map the physical category User and the database table.@RePOSITORY annotation is used to identify the component of the UserRePOSITORY class as the data access layer.In UserRePOSITORY, the EntityManager is injected into it by using @Autowired annotations to achieve the operation of the database.In UserService, the business logic calls by calling the userRePOSITORY method.
In addition to the above example code and the use of annotations, the UJO ORM framework also provides some configuration files, such as Persistence.xml, ORM.XML, etc. It is used to configure the mapping relationship between the physical class and the database table, database connection, etc.Application requirements.
It should be noted that the above example code and related configuration are only used to demonstrate the basic characteristics and design principles of the UJO ORM framework. The code and configuration in the specific application may be different due to project needs.
