企业级应用中的常见难题：Java持久化框架如Hibernate的使用案例-蒲公英云

企业级应用中的常见难题：Java持久化框架如Hibernate的使用案例

原创末蓝、 2024-10-21 03:33 153阅读 0赞

Java持久化框架，如Hibernate，主要用于管理关系数据库中的对象。以下是一个使用Hibernate处理企业级应用中的订单管理的简单案例：

创建实体类（Order.java）：
```java
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Order {

@Id
@GeneratedValue(strategy = GenerationType.AUTO))
private Long id;
private String customerName;
private Product product;
// getters and setters

}

2. 创建Product实体类（Product.java）：
```java
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class Product {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO))
    private Long id;
    private String productName;
    // getters and setters
}

创建Hibernate持久化类（OrderManager.java）：
```java
import org.hibernate.Session;
import org.hibernate.query.Query;

public class OrderManager {

public Long createNewOrder(String customerName, Product product) {
    Session session = HibernateUtil.getSessionFactory().openSession();
    try {
        // Save the new order
        Order newOrder = new Order(customerName, product));
        session.save(newOrder);
        return newOrder.getId();
    } finally {
        session.close();
    }
}
public List<Order> getOrdersByCustomer(String customerName) {
    Session session = HibernateUtil.getSessionFactory().openSession();
    try {
        Query query = session.createQuery("FROM Order WHERE customerName = :customerName)");
        query.setParameter("customerName", customerName);
        return query.list();
    } finally {
        session.close();
    }
}