---------------------siwuxie095
HibernateTemplate 实现 CRUD 操作
1、在SSH 框架中使用 HibernateTemplate 模板类实现 CRUD 操作
2、HibernateTemplate 是 Spring 对 Hibernate 的封装
3、使用HibernateTemplate 时,必须进行事务管理,否则将报错
建议:使用基于注解方式的声明式事务管理
4、测试
(1)编写一个实体类
User.java:
package com.siwuxie095.entity;
public class User {
private Integer uid; private String username; private String address; ??? public Integer getUid() { return uid; ???} publicvoid setUid(Integer uid) { this.uid = uid; ???} ??? public String getUsername() { return username; ???} publicvoid setUsername(String username) { this.username = username; ???} ??? public String getAddress() { return address; ???} publicvoid setAddress(String address) { this.address = address; ???} ??? @Override public String toString() { return"User [uid=" + uid + ", username=" + username + ", address=" + address + "]"; ???} ??? } |
(2)编写一个Action 类
UserAction.java:
package com.siwuxie095.action;
import com.opensymphony.xwork2.ActionSupport; import com.siwuxie095.service.UserService;
public class UserAction extends ActionSupport { ??? private UserService userService; ??? publicvoid setUserService(UserService userService) { this.userService = userService; ???}
??? @Override public String execute() throws Exception { ??????? //userService.add(); ???????userService.find(); ??????? return"none"; ???} ??? } |
(3)编写一个Service 类
UserService.java:
package com.siwuxie095.service;
import org.springframework.transaction.annotation.Transactional;
import com.siwuxie095.dao.UserDao;
/** * 在 Service 层进行声明式事务管理 * 即加上注解 @Transactional * * 使用 HibernateTemplate 实现 CRUD 操作, * 一定要加上事务管理,否则将报错 */ @Transactional public class UserService { ??? private UserDao userDao; ??? publicvoid setUserDao(UserDao userDao) { this.userDao = userDao; ???} ??? publicvoid add() { ???????userDao.add(); ???} ??? publicvoid find() { ???????userDao.find(); ???} ??? } |
(4)编写一个Dao 接口和其实现类:
UserDao.java:
package com.siwuxie095.dao;
public interface UserDao { ??? publicvoid add(); publicvoid find(); ??? } |
UserDaoImpl.java:
package com.siwuxie095.dao.impl;
import java.util.List;
import org.springframework.orm.hibernate5.HibernateTemplate;
import com.siwuxie095.dao.UserDao; import com.siwuxie095.entity.User;
public class UserDaoImpl implements UserDao { ??? private HibernateTemplate hibernateTemplate; ??? publicvoid setHibernateTemplate(HibernateTemplate hibernateTemplate) { this.hibernateTemplate = hibernateTemplate; ???} ??? ??? @Override publicvoid add() { ???????User user=new User(); ???????user.setUsername("小白"); ???????user.setAddress("中国"); ???????hibernateTemplate.save(user); ??????? /* ????????* HibernateTemplate 还有 update()、delete() 方法, ????????* 都是直接传入对象即可 ????????*/ ???}
@Override publicvoid find() { ??????? // 根据 id 查询 ???????User user=hibernateTemplate.get(User.class, 1); ???????System.out.println(user); ???????System.out.println("------------------"); ??????? // 查询所有 ???????List<User> list=(List<User>) hibernateTemplate.find("from User"); ??????? for (User user1 : list) { ???????????System.out.println(user1); ???????} ??????? ???????System.out.println("------------------"); ??????? // 根据条件查询 ???????List<User> listx=(List<User>) hibernateTemplate.find("from User where username=?", "小黑"); ??????? for (User user2 : listx) { ???????????System.out.println(user2); ???????} ??????? /* ????????* HibernateTemplate 的 findByCriteria() 方法可以做到分页查询 ????????* ????????* find() 方法则无法做到 ????????*/ ??????? ???}
} |
(5)在Hibernate 映射配置文件中进行配置
User.hbm.xml:
<?xmlversion="1.0"encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> ??? <hibernate-mapping>
<classname="com.siwuxie095.entity.User"table="t_user"> ??? <idname="uid"column="uid"> <generatorclass="native"></generator> </id> ??????? <propertyname="username"column="username"></property> <propertyname="address"column="address"></property> ??????? </class> </hibernate-mapping> |
(6)在Hibernate 核心配置文件中进行配置
hibernate.cfg.xml:
<?xmlversion="1.0"encoding="UTF-8"?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> ??? ??????? <propertyname="hibernate.show_sql">true</property> <propertyname="hibernate.format_sql">true</property> <!-- 注意:只有配置 hibernate.hbm2ddl.auto 为 update,才能自动创建表 --> <propertyname="hibernate.hbm2ddl.auto">update</property> <propertyname="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> <!-- 原来的配置: ????????????<property name="hibernate.current_session_context_class">thread</property> ???????????? 在 SSH 框架整合中会报错,要么将这个配置删了,要么改成如下配置 ???????????? 参考链接:http://blog.csdn.net/maoyuanming0806/article/details/61417995 ????????--> <propertyname="hibernate.current_session_context_class"> ???????org.springframework.orm.hibernate5.SpringSessionContext </property> ??????? ??????? <mappingresource="com/siwuxie095/entity/User.hbm.xml"/> ??????? ??????? </session-factory> </hibernate-configuration> |
(7)在Spring 核心配置文件中进行配置
applicationContext.xml:
<?xmlversion="1.0"encoding="UTF-8"?> <beansxmlns="http://www.springframework.org/schema/beans" ???xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ???xmlns:aop="http://www.springframework.org/schema/aop" ???xmlns:context="http://www.springframework.org/schema/context" ???xmlns:tx="http://www.springframework.org/schema/tx" ???xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd"> ??? ??? <!-- (1) --> <!-- 配置 C3P0 连接池 --> <beanid="dataSource"class="com.mchange.v2.c3p0.ComboPooledDataSource"> <propertyname="driverClass"value="com.mysql.jdbc.Driver"/> <!-- ???????????jdbc:mysql:///test_db 是 jdbc:mysql://localhost:3306/test_db 的简写 ????????--> <propertyname="jdbcUrl"value="jdbc:mysql:///test_db"/> <propertyname="user"value="root"/> <propertyname="password"value="8888"/> </bean> ??? ??? <!-- SessionFactory 对象的创建交给 Spring 进行管理 ?--> <beanid="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean"> <!-- 因为在 Hibernate 核心配置文件中,没有数据库配置, 而是在 Spring 的核心配置文件中进行配置,所以需要 注入 dataSource ??????????? ???????????LocalSessionFactoryBean 中有相关属性,所以可以 注入 ????????--> <propertyname="dataSource"ref="dataSource"></property> <!-- 指定 Hibernate 核心配置文件的位置 --> <propertyname="configLocations"value="classpath:hibernate.cfg.xml"></property> </bean> ??? ??? ??? <!-- (2) --> <!-- 配置 Action 对象 --> <beanid="userAction"class="com.siwuxie095.action.UserAction"> <propertyname="userService"ref="userService"></property> </bean> ??? <!-- 配置 Service 对象 --> <beanid="userService"class="com.siwuxie095.service.UserService"> <propertyname="userDao"ref="userDaoImpl"></property> </bean> ??? <!-- 配置 Dao 实现类对象 --> <beanid="userDaoImpl"class="com.siwuxie095.dao.impl.UserDaoImpl"> <propertyname="hibernateTemplate"ref="hibernateTemplate"></property> </bean> ??? <!-- 配置 HibernateTemplate 对象 --> <beanid="hibernateTemplate"class="org.springframework.orm.hibernate5.HibernateTemplate"> <!-- 注入 SessionFactory 对象 --> <propertyname="sessionFactory"ref="sessionFactory"></property> </bean> ??? ??? ??? <!-- (3) --> <!-- 配置事务管理器 HibernateTransactionManager --> <beanid="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager"> <!--注入 SessionFactory 对象 --> <propertyname="sessionFactory"ref="sessionFactory"></property> </bean> ??? <!-- 开启事务注解 --> <tx:annotation-driventransaction-manager="transactionManager"/> ??? ??? </beans> |
(8)在Struts2 核心配置文件中进行配置
struts.xml:
<?xmlversion="1.0"encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts> ??? <packagename="demo"extends="struts-default"namespace="/"> ??????? <!-- 此时,class 属性对应 Spring 核心配置文件中 Bean 的 id ??????????? 如果还写 Action 类的全限定名,Action 对象就会创建两次 ????????--> <actionname="user"class="userAction"></action> ??????? </package>
</struts> |
(9)在部署描述文件中进行配置
web.xml:
<?xmlversion="1.0"encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"version="3.1"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> ? ? <filter> <!-- 配置 Struts2 的核心过滤器 --> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter>
<filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> ??? ??? <!-- 配置 Spring 的监听器 ContextLoaderListener --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> ??? ??? <!-- 配置 Spring 核心配置文件的位置(路径) --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> ? ? </web-app> |
(10)访问路径
http://localhost:8080/工程名/user.action
【made by siwuxie095】
HibernateTemplate实现CRUD操作
原文地址:http://www.cnblogs.com/siwuxie095/p/7439543.html