Use the UJO ORM framework to build a high -performance Java class library application
Use the UJO ORM framework to build a high -performance Java class library application
Overview:
UJO ORM (Unify Java Object) is a simple and powerful Java Orem framework, which aims to help developers build high -performance Java -class libraries.This article will introduce how to use the UJO ORM framework to build a high -performance Java class library application, and provide related programming code and configuration description.
Introduce the UJO ORM framework:
The UJO ORM framework provides a lightweight and easy -to -use method to manage the mapping between the Java object and the relationship database.It has the characteristics of high performance, flexibility, and scalability, enabling developers to focus more on the implementation of business logic without paying attention to the database operation details of the underlying layer.
1. Environmental preparation:
Before starting, you need to ensure that the following environment is ready:
-JAVA Development Environment (JDK)
-Maven building tool
-The relationship database (such as MySQL, Oracle, etc.)
2. Introduce the UJO ORM framework:
First, add the following dependencies to your Maven project configuration file (POM.XML):
<dependency>
<groupId>org.ujorm</groupId>
<artifactId>ujorm</artifactId>
<version>1.86</version>
</dependency>
Then execute Maven built so that the UJO ORM framework is introduced into your project.
3. Create a physical class:
In your Java library, you need to create a physical class corresponding to the database table.For example, suppose you have a user table, which contains fields such as ID, name, and Age.You can create a User class to map this table, and use the UJO ORM annotation to define the mapping relationship between the field and the database table.
import org.ujorm.orm.annot.Column;
import org.ujorm.orm.annot.Table;
import org.ujorm.core.Ujo;
import org.ujorm.orm.annot.View;
@Table("users")
public class User implements Ujo {
@Column(pk = true)
private Long id;
@Column
private String name;
@Column
private int age;
// omit the getter and setter method
}
In the above code, the@Table annotation is used to specify the corresponding database table name of this class, and the@column annotation is used to specify the mapping relationship between the field and the database column.
4. Database configuration:
In your project, you need to configure the UJO ORM framework to connect to the database.You can connect to the database connection in the resource file (such as Application.Properties).
db.driver=com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/database_name
db.username=username
db.password=password
These configurations will be automatically loaded by the UJO ORM framework and are used in database connections.
5. Database operation:
Once a database connection is configured, you can use the API of the UJO ORM framework to perform various database operations, such as insertion, update, query, etc.
import org.ujorm.orm.Session;
import org.ujorm.orm.OrmHandler;
// Initialization
Session session = OrmHandler.getInstance().startSession();
// Insert data
User user = new User();
user.setName ("Zhang San");
user.setAge(25);
session.save(user);
// update data
User updateUser = session.createQuery(User.class)
.where(User.ID.whereEq(1L))
.uniqueResult();
updateUser.setName ("Li Si");
session.update(updateUser);
// Query data
User queryUser = session.createQuery(User.class)
.where (user.name.whereq ("Li Si")))
.uniqueResult();
System.out.println("User's age: " + queryUser.getAge());
// Close the session
session.close();
In the above example code, we first obtain a session through ORMHANDLER, and then use the session object to perform the database operation.For example, we inserted a new user data, updated a user data, and found the age of the user through query.
Finally, we need to ensure that it is closed after using the session to release resources.
Summarize:
By using the UJO ORM framework, you can build a high -performance Java class library application.This article introduces how to use the UJO ORM framework and provide related programming code and configuration description.I hope this article is helpful for you to build a Java class library application in using the UJO ORM framework!
