dao | 易学教程

Data access object (DAO) in Java

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问题 I was going through a document and I came across a term called DAO . I found out that it is a Data Access Object. Can someone please explain me what this actually is? I know that it is some kind of an interface for accessing data from different types of sources, in the middle of this little research of mine I bumped into a concept called data source or data source object, and things got messed up in my mind. I really want to know what a DAO is programmatically in terms of where it is used.

micro-mvc框架支持mvc各层业务代码热部署

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micro-mvc框架，可以与springmvc和springcloud整合,使所有的controller、servicebean、dao和sql业务逻辑代码都支持热部署方便开发人员调式和生产部署。源码与demo地址： https://github.com/jeffreyning/micro-mvc 与springmvc整合过程编写Controller接口整合后Springmvc的controller只编写接口，参数名称必须用RequestParam注解。使用InjectGroovy注解在接口中声明对应的groovy实现名称。其他与传统springmvc的controller无异。 package foo.web; import java.util.Map; import javax.servlet.http.HttpServletRequest; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind

JSF Controller, Service and DAO

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问题 I\'m trying to get used to how JSF works with regards to accessing data (coming from a spring background) I\'m creating a simple example that maintains a list of users, I have something like <h:dataTable value=\"#{userListController.userList}\" var=\"u\"> <h:column>#{u.userId}</h:column> <h:column>#{u.userName}</h:column> </h:dataTable> Then the \"controller\" has something like @Named(value = \"userListController\") @SessionScoped public class UserListController { @EJB private

Where does the @Transactional annotation belong?

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问题 Should you place the @Transactional in the DAO classes and/or their methods or is it better to annotate the Service classes which are calling using the DAO objects? Or does it make sense to annotate both \"layers\"? 回答1: I think transactions belong on the Service layer. It's the one that knows about units of work and use cases. It's the right answer if you have several DAOs injected into a Service that need to work together in a single transaction. 回答2: In general I agree with the others

spring @component的作用详细介绍

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1、@controller 控制器（注入服务） 2、@service 服务（注入dao） 3、@repository dao（实现dao访问） 4、@component （把普通pojo实例化到spring容器中，相当于配置文件中的<bean id="" class=""/>）　 @Component,@Service,@Controller,@Repository注解的类，并把这些类纳入进spring容器中管理。下面写这个是引入component的扫描组件 <context:component-scan base-package=”com.mmnc”> 其中base-package为需要扫描的包（含所有子包） 1、@Service用于标注业务层组件 2、@Controller用于标注控制层组件(如struts中的action) 3、@Repository用于标注数据访问组件，即DAO组件. 4、@Component泛指组件，当组件不好归类的时候，我们可以使用这个注解进行标注。 @Service public class UserServiceImpl implements UserService { } @Repository public class UserDaoImpl implements UserDao { } getBean的默认名称是类名（头字母小写）

简单的权限管理php

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转发自https://www.cnblogs.com/shenzikun1314/p/6604867.html#4262295 首先，要明白的基础理论是用户，角色，权限之间的关系是一对多，还是多对多。据此来建立表。一个用户可以属于多个角色，比如邓超。他是孙俪的丈夫，同时是他小孩的父亲，还是他老爸的儿子。那么这里他一共有丈夫，父亲，儿子3个角色。一个角色可以有多个用户。比如学生（角色），张三，李四，王五等。所以用户跟角色是多对多的关系。一个角色可以多个权限。比如把文章模块分为查看，修改，添加，删除这4个权限。普通用户只有查看的权限，但管理员他可以同时有这4个权限。一个权限也可以被多个角色同时拥有。普通用户和管理员都有查看权限。所以权限跟角色也是多对多的关系。下面开始建表第一张用户表第二张角色表第三张权限表接下来是2张中间表。用户-角色表（要设置多对多的外键关联关系）最后一张角色-权限表（设置多对多的关联关系）接下来是代码第一个guanli.php,用到ajax等jquery语法，要引用jquery文件。这个页面是修改用户的角色权限 <?php error_reporting(E_ALL ^ E_DEPRECATED); include("DB.class.php"); $sql = "select * from qx_user"; $arr = $dao