Samuel Learning

為AppFusex框架項目減肥

簡單的看了一下SpringSide，發現里面的底層代碼實現CRUD之后，實現新的類之后，不需要在重復實現這些代碼。然后一看AppFuse，原來也有這個功能，只不過Matt 的User模塊誤導了。不涉及復雜業務的Service和Dao層根本沒必要重寫這些方法。以前浪費時間啊。
下面對比一下減肥前后的代碼：
DAO--interface，注釋的部分就是被減去的部分

public ? interface ?CustomerDao? extends ?Dao? {
???? // Retrieve
// ????public?Customer?getCustomer(Long?customerId);
???? public ?List?getCustomers(Customer?customer);

???? // Create?or?Update
???? // public?void?saveCustomer(Customer?customer);
????
???? // Delete
// ????public?void?removeCustomer(Long?customerId);
}

DAO--class,注釋的部分就是被減去的部分

public ? class ?CustomerDaoHibernate? extends ?BaseDaoHibernate? implements
????????CustomerDao? {

// ????public?Customer?getCustomer(Long?customerId)?{
// ????????return?(Customer)?getHibernateTemplate().get(Customer.class,
// ????????????????customerId);
// ????}

???? public ?List?getCustomers(Customer?customer)? {
???????? return ?getHibernateTemplate().find( " from?Customer " );
????}

// ????public?void?saveCustomer(Customer?customer)?{
// ????????getHibernateTemplate().saveOrUpdate(customer);
//
// ????}

// ????public?void?removeCustomer(Long?customerId)?{
// ????????Object?customer?=?getCustomer(customerId);
// ????????getHibernateTemplate().delete(customer);
// ????}

}

public?interface?CustomerManager?extends?Manager{
????//?Dependency?Injection?by?set?method
????public?void?setCustomerDao(CustomerDao?customerDao);
????//Query?total
????//public?int?getTotalCustomers(Customer?c);
????//?Retrieve
????public?List?getCustomers(Customer?customer);
//????public?Customer?getCustomer(Long?customerId);
????//?Create?or?Update
//????public?void?saveCustomer(Customer?customer);
????//?Delete
//????public?void?removeCustomer(Long?customerId);
}

public?class?CustomerManagerImpl?extends?BaseManager?implements?CustomerManager?{

????private?CustomerDao?customerDao;
????
????//DI?
????public?void?setCustomerDao(CustomerDao?customerDao)?{
????????this.customerDao=customerDao;
????}

????public?List?getCustomers(Customer?customer)?{
????????return?customerDao.getCustomers(customer);
????}

//????public?Customer?getCustomer(Long?customerId)?{
//????????return?customerDao.getCustomer(customerId);
//????}

//????public?void?saveCustomer(Customer?customer)?{
//????????//customerDao.saveCustomer(customer);
//????????customerDao.saveObject(customer);
//????}

//????public?void?removeCustomer(Long?customerId)?{
//????????
//????????customerDao.removeCustomer(customerId);
//????????customerDao.removeObject(new?Customer().getClass(),customerId);
//????}
}

ManagedBean

?

public?String?edit()?{
????????//customer?=?customerManager.getCustomer(new?Long(getParameter("pkid")));
????????customer?=?(Customer)customerManager.getObject(customer.getClass(),new?Long(getParameter("pkid")));
????????return?"edit";
????}

try?{
????????????//customerManager.saveCustomer(customer);
????????????customerManager.saveObject(customer);
????????}?catch?(Exception?e)?{
????????????log.warn(e.getMessage());
????????????addError("add.customer.failed");
????????????return?null;
????????}

//刪除動作
????public?String?delete()?{
????????//customerManager.removeCustomer(customer.getPkid());
????????customerManager.removeObject(customer.getClass(),customer.getPkid());
????????addMessage("delete.customer.success");
????????return?"list";
????}

????<bean?id="customerManager"?parent="txProxyTemplate">
????????<property?name="target">
????????????<bean?class="com.appwork.service.impl.CustomerManagerImpl">
????????????????<property?name="customerDao"?ref="customerDao"/>
????????????????<property?name="dao"?ref="dao"/>
????????????</bean>
????????</property>
????</bean>

接下來需要研究如何擴充查詢的底層代碼，實現復雜的查詢，并且能在底層實現數據庫級別的分頁。

另外總結出一個結論：
自增長ID的POJO不需要在Dao實現update方法，save和update能夠使用同一個方法；
人工賦值ID的POJO需要在Dao分別實現save方法和updagte方法。
原因：人工賦值ID的POJO無法區分出add 重復的對象，第二次add同一個對象，會執行update。

posted on 2006-09-07 23:25 MingIsMe 閱讀(91) 評論(0)  編輯  收藏 所屬分類: 06 J2EE