java数据库对象

import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManager;
import javax.jdo.Query;

public class JdoExample {
    public static void main(String[] args) {
        PersistenceManager pm = JDOHelper.getPersistenceManagerFactory("transactions-optional").getPersistenceManager();

        // 创建一个持久化对象
        MyPersistentObject obj = new MyPersistentObject();
        obj.setName("John Doe");
        obj.setAge(30);

        // 持久化对象到数据库
        pm.makePersistent(obj);

        // 查询数据库中的对象
        Query query = pm.newQuery(MyPersistentObject.class, "name == 'John Doe'");
        MyPersistentObject result = (MyPersistentObject) query.executeUnique();

        System.out.println("Name: " + result.getName() + ", Age: " + result.getAge());

        // 关闭PersistenceManager
        pm.close();
    }
}

class MyPersistentObject {
    private String name;
    private int age;

    // Getters and Setters
    public String getName() { return name; }
    public void setName(String name) { this.name = name; }
    public int getAge() { return age; }
    public void setAge(int age) { this.age = age; }
}