Learn from the configuration and usage of Jpattern ORM
Learn from the configuration and usage of Jpattern ORM
Jpattern ORM is a lightweight object -to -mapping (ORM) framework, which aims to simplify the interaction between Java applications and databases.It provides a flexible configuration and powerful query function, enabling developers to manage and operate databases easier.
Before starting to use JPattern Orem, we need to configure first.The following is the configuration step of JPattern ORM:
1. Introduce the JPattern ORM library file: Add JPattern ORM dependencies in the project construction file (such as Maven or Gradle).
Maven example:
<dependency>
<groupId>com.jporm</groupId>
<artifactId>jporm</artifactId>
<version>1.6.0</version>
</dependency>
Gradle example:
gradle
implementation 'com.jporm:jporm:1.6.0'
2. Create a database connection configuration file: Create a file called `JPorm.properties` in the resource folder of the project and configure the database connection information in it.For example:
properties
db.url=jdbc:mysql://localhost:3306/mydatabase
db.username=root
db.password=123456
3. Create a physical class: Create a physical class corresponding to the database table in the Java application.The field of the physical class should correspond to the name of the table and mark the annotations provided by the JPattern Orem.For example:
@Table(tableName = "users")
public class User {
@Id
@Column(name = "id")
private Long id;
@Column(name = "name")
private String name;
// Getters and setters
}
4. Initialize JPattern ORM: At the entrance of the application, initialize the JPattern ORM and load the database to connect the configuration file.For example:
public class Application {
public static void main(String[] args) {
JpoRm jpOrm = JpoRm.getInstance();
try {
jpOrm.buildSessionFactory(new PropertiesLoader().load("jporm.properties"));
} catch (JpoException e) {
e.printStackTrace();
}
// Use Jpattern ORM for database operation
}
}
After the configuration is completed, we can use JPattern ORM to perform various database operations, such as inserting, updating, deleting and querying.Here are some examples of use of JPattern ORM:
1. Insert data:
User user = new User();
user.setName("John Doe");
jpOrm.tx(session -> session.save(user));
2. Update data:
User user = jpOrm.tx(session -> session.findById(User.class, 1L));
user.setName("Jane Smith");
jpOrm.tx(session -> session.update(user));
3. Delete data:
jpOrm.tx(session -> {
User user = session.findById(User.class, 1L);
session.delete(user);
});
4. Query data:
List<User> users = jpOrm.tx(session -> session.find(User.class).fetchAll());
By using JPattern ORM, we can simplify the interaction between Java applications and databases and improve development efficiency.Using the powerful query function of JPATTERN ORM, we can easily perform complex database query operations and obtain the required results.
To sum up, JPattern ORM is a simple and flexible ORM framework, which is very suitable for database operations for Java applications.By configured according to the above steps, we can easily use JPattern ORM to manage and operate the database.
