Hibernate 遇到的问题（１）

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错误Batch update returned unexpected row count from update [0]; actual row count: 0;
，Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1这个异常是由于主键设置为自增长，而在我们插入记录的时候设置了ID的值导致的。
刚刚使用SSH框架时，遇到了一个bug:
原：applicationContext.xml

 <bean name="orderAction" class="Action.OrderAction" scope="prototype">        <property name="orderService" ref="OrderServiceImpl"/>    </bean>

原 OrderAction:

public class OrderAction extends SupAction{    private OrderServiceImpl orderService;    private UserServiceImpl userService;    private List<Order> orderList;    private List<User> userList;    public OrderServiceImpl getOrderService() {        return orderService;    }    public void setOrderService(OrderServiceImpl orderService) {        this.orderService = orderService;    }    public List<Order> getOrderList() {        return orderList;    }    public void setOrderList(List<Order> orderList) {        this.orderList = orderList;    }    public UserServiceImpl getUserService() {        return userService;    }    public void setUserService(UserServiceImpl userService) {        this.userService = userService;    }    public String ordermanage(){        System.out.println("OrderExec:Log");        this.orderList = this.orderService.fetchAll();        this.userList = this.userService.fetchAll();        System.out.println("User List Size:");        System.out.println(this.userList.size());        return SUCCESS;    }}

总的来讲，电脑都是按照顺序一步一步执行的，在写代码的时候，要明白流程，这个是很重要的，刚才的例子，我直接在　OrderAction　中更改，添加了userService，想着和OrderService一样，可以完成目标，但是忘记了我是使用Spring注入的Service，所以这里犯了第一个错误．然后第二个错误，没有给userList的get,set方法，因为在使用IDEA的代码生成功能时，求快，只生成了userService的set,get方法．
更改后：

   <bean name="orderAction" class="Action.OrderAction" scope="prototype">        <property name="orderService" ref="OrderServiceImpl"/>        <property name="userService" ref="UserServiceImpl"/>    </bean>public class OrderAction extends SupAction{    private OrderServiceImpl orderService;    private UserServiceImpl userService;    private List<Order> orderList;    private List<User> userList;    public OrderServiceImpl getOrderService() {        return orderService;    }    public void setOrderService(OrderServiceImpl orderService) {        this.orderService = orderService;    }    public List<Order> getOrderList() {        return orderList;    }    public void setOrderList(List<Order> orderList) {        this.orderList = orderList;    }    public UserServiceImpl getUserService() {        return userService;    }    public void setUserService(UserServiceImpl userService) {        this.userService = userService;    }    public List<User> getUserList() {        return userList;    }    public void setUserList(List<User> userList) {        this.userList = userList;    }    public String ordermanage(){        System.out.println("OrderExec:Log");        this.orderList = this.orderService.fetchAll();        this.userList = this.userService.fetchAll();        System.out.println("User List Size:");        System.out.println(this.userList.size());        return SUCCESS;    }}

写代码时要讲究流程，明确流程先后顺序．

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