Question

myeclipse SSH 下报错 attempt to create saveOrUpdate event with null entity

流程 往ordercargo表中增加1条记录 表中含2个外键orderId 和 cargoId 需要从 order 和 cargo表中取得 jsp-action-service-dao 的流程

代码如下
jsp
<s:form action="addOrderCargo" theme="simple">

<s:select name="orderCargo.cargoId" list="#request.cargoIdMap" label="物品类别" listKey="key"
listValue="value" headerKey="0" headerValue="选择类别"></s:select>
<s:select name="orderCargo.orderId" list="#request.orderIdMap" label="物品类别" listKey="key"
listValue="value" headerKey="0" headerValue="选择类别1"></s:select>

<s:textfield name="orderCargo.orderCargoNum" label="订购数量"></s:textfield>
<s:textfield name="orderCargo.orderCargoSortPrice" label="价格"></s:textfield>
<s:textfield name="orderCargo.qualityAdminId" label="质量管理员ID"></s:textfield>
<s:textfield name="orderCargo.qualityCargo" label="产品质量"></s:textfield>
<s:textfield name="orderCargo.qualityInfo" label="质量信息"></s:textfield>
<s:textfield name="orderCargo.qualityTime" label="检测日期"></s:textfield>
<s:textfield name="orderCargo.stockAdminId" label="stockAdminId"></s:textfield>
<s:textfield name="orderCargo.stockTypeId" label="stockTypeId"></s:textfield>
<s:textfield name="orderCargo.inStockTime" label="inStockTime"></s:textfield>
<s:textfield name="orderCargo.cargoProTime" label="cargoProTime"></s:textfield>
<s:submit></s:submit>

</s:form>

action

// 外键
public String toAddCargo() {
List<Cargo> cargoIdList = orderCargoService.findAllCargoId();
HashMap<Integer, String> cargoIdMap = new LinkedHashMap<Integer, String>();
for (Cargo a : cargoIdList) {
cargoIdMap.put(a.getCargoId(), a.getCargoName());
}
System.out.print(cargoIdMap.get(1));
request.setAttribute("cargoIdMap", cargoIdMap);
return SUCCESS;
}
public String toAddOrder() {
List<Order> orderIdList = orderCargoService.findAllOrderId();
HashMap<Integer, String> orderIdMap = new LinkedHashMap<Integer, String>();
for (Order a : orderIdList) {
orderIdMap.put(a.getOrderId(), a.getOrderTime());
}
System.out.print(orderIdMap.get(1));
request.setAttribute("orderIdMap", orderIdMap);
return SUCCESS;
}
public String addOrderCargo() {
orderCargoService.addOrderCargo(orderCargo);
return SUCCESS;
}

service

public void addOrderCargo(OrderCargo transientInstance) {
orderCargoDAO.save(transientInstance);
}
//根据ID查找所有物品和订单
public List findAllOrderId(){
return orderDAO.findAll();
}
public List findAllCargoId(){
return cargoDAO.findAll();
}

public void addOrderCargo(OrderCargo transientInstance) {
orderCargoDAO.save(transientInstance);
}

dao

public void save(OrderCargo transientInstance) {

log.debug("saving OrderCargo instance");
try {
getHibernateTemplate().save(transientInstance);
log.debug("save successful");
} catch (RuntimeException re) {
log.error("save failed", re);
throw re;
}
}
struts 配置
<action name="addOrderCargo" class="OrderCargoAction" method="addOrderCargo">
<result name="success" >qualityadmin/addOrderCargo.jsp
</result>
</action>

spring中的配置
<bean id="OrderCargoDAO" class="com.logistics.po.OrderCargoDAO"
scope="prototype">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<bean id="OrderCargoService" class="com.logistics.service.OrderCargoService"
scope="prototype">
<property name="orderCargoDAO">
<ref bean="OrderCargoDAO" />
</property>
<property name="orderDAO">
<ref bean="OrderDAO"/>
</property>
<property name="cargoDAO">
<ref bean="CargoDAO"/>
</property>
</bean>
<bean id="OrderCargoAction" class="com.logistics.action.OrderCargoAction"
scope="prototype">
<property name="orderCargoService">
<ref bean="OrderCargoService" />
</property>
</bean>

debug显示 cargoorder 和dao中transientInstance 是null 没能传值 求高手解答

Answer 1

应该就是save的那个对象是null吧，也就是在：
public String addOrderCargo() {
orderCargoService.addOrderCargo(orderCargo);
return SUCCESS;
}
你的action中orderCargo是null，也就是你的action没有成功从页面上取到值。

Answer 2

public String addOrderCargo() {
orderCargoService.addOrderCargo(orderCargo);
return SUCCESS;
}

public void addOrderCargo(OrderCargo transientInstance) {
orderCargoDAO.save(transientInstance);
}

dao
public void save(OrderCargo transientInstance) {

你这个dao中的transientInstance 是从action中的orderCargo直接传过来的
由于你action代码不全，也看不出来orderCargo是什么，你自己看看吧