hibernate实例简析-hibernate_pessimistic_locking

悲观锁

悲观锁的实现，通常依赖于数据库机制，在整个过程中将数据锁定，其它任何用户都不能读取或修改
===
Inventory inv = (Inventory)session.load(Inventory.class, 1, LockMode.UPGRADE);
System.out.println("itemName=" + inv.getItemName());
System.out.println("quantity=" + inv.getQuantity());
inv.setQuantity(inv.getQuantity() - 200);
session.update(inv);
---
Inventory inv = (Inventory)session.load(Inventory.class, 1, LockMode.UPGRADE);
System.out.println("itemName=" + inv.getItemName());
System.out.println("quantity=" + inv.getQuantity());
inv.setQuantity(inv.getQuantity() - 200);
session.update(inv);
===
<hibernate-mapping>
<class name="com.bjsxt.hibernate.Inventory" table="t_inventory">
<id name="itemNo">
<generator class="native"/>
</id>
<property name="itemName"/>
<property name="quantity"/>
</class>
</hibernate-mapping>
===
Inventory inv = new  Inventory();
inv.setItemNo(1001);
inv.setItemName("脑白金");
inv.setQuantity(1000);

session.save(inv);
===
public class Inventory {

private int itemNo;

private String itemName;

private int quantity;