The technical principles of UJO ORM framework in the Java library
The technical principles of UJO ORM framework in the Java library
Abstract: The ORM (Object Relationship Map) framework is an important part of modern software development. It establishes a bridge between the database and the object -oriented programming language.Ujo (Universal Java Object) is an ORM framework based on Pojo (PLAIN OLD Java Object). It provides developers with a simple and easier way to operate the database.This article will explore the technical principles of the UJO ORM framework in the Java class library and give some Java code examples to help readers better understand their applications.
Introduction to UJO ORM framework
UJO is a lightweight ORM framework that designed for Java programming language.Compared with other ORM frameworks, UJO has more powerful domain model support and better scalability.It is based on the POJO programming model and uses annotations to maximize the relationship between the Java object and the database table, allowing developers to quickly and simply operate the database.
Second, the core principle of the UJO ORM framework
1. Field model support: The UJO ORM framework allows developers to encapsulate business logic in the Java class and operate the database through access and operation of the class.UJO provides a set of annotations to define the entities, attributes, and relationships in the models, enabling developers to design a data structure according to business needs.
2. Database mapping: UJO uses annotations to define the mapping relationship between the Java class and the database table.Developers can use @table annotations to identify a table in the database of a class, and use the @Column annotation to identify the columns in the database table of the database table.At the same time, UJO also supports one -to -one, one -to -many, and more relationship mapping, which is completed by using @Relation annotations.
3. Data visit: UJO provides a set of simple and powerful APIs for data CRUD (creation, reading, updating, and deleting) operations.Developers can perform various database operations by calling UJO's APIs, such as inserting, querying, updating, and deleting data.UJO also supports advanced query functions. It can use standard SQL syntax or use the query object provided by UJO for complex query.
4. Affairs management: The UJO ORM framework can effectively manage the transaction and ensure the consistency and integrity of the data.It provides transaction annotations and API so that developers can manage affairs in a statement.By using @Transactional annotations to identify a method or class, developers can ensure that the data operations during the method execution process are within one transaction range.
Third, application example of the UJO ORM framework
The following uses a few simple Java code examples to demonstrate the application of the UJO ORM framework.
1. Define a domain model class:
@Table(name = "user")
public class User {
@Column(name = "id")
private int id;
@Column(name = "name")
private String name;
// omit the getter and setter method
}
2. Database query operation:
UjoCRUD ujoCRUD = new UjoCRUD();
List<User> userList = ujoCRUD.select(User.class).execute();
for (User user : userList) {
System.out.println(user.getName());
}
3. Database insertion operation:
UjoCRUD ujoCRUD = new UjoCRUD();
User user = new User();
user.setId(1);
user.setName ("Zhang San");
ujoCRUD.insert(user).execute();
4. Database update operation:
UjoCRUD ujoCRUD = new UjoCRUD();
User user = new User();
user.setId(1);
user.setName ("Li Si");
ujoCRUD.update(user, 1).execute();
5. Database deletion operation:
UjoCRUD ujoCRUD = new UjoCRUD();
ujoCRUD.delete(User.class, 1).execute();
In summary, the UJO ORM framework is a simple and powerful ORM tool, which provides a easy -to -use and reliable way to operate the database.Through the UJO ORM framework, developers can easily combine object -oriented programming with database operations to improve development efficiency and code quality.
