---------------------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; } public void setUid(Integer uid) { this.uid = uid; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getAddress() { return address; } public void 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; public void 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; public void setUserDao(UserDao userDao) { this.userDao = userDao; } public void add() { userDao.add(); } public void 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 { public void add(); public void 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; public void setHibernateTemplate(HibernateTemplate hibernateTemplate) { this.hibernateTemplate = hibernateTemplate; } @Override public void 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 public void 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:
<?xml version="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> <class name="com.siwuxie095.entity.User" table="t_user"> <id name="uid" column="uid"> <generator class="native"></generator> </id> <property name="username" column="username"></property> <property name="address" column="address"></property> </class> </hibernate-mapping> |
(6)在 Hibernate 核心配置文件中进行配置
hibernate.cfg.xml:
<?xml version="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> <property name="hibernate.show_sql">true</property> <property name="hibernate.format_sql">true</property> <!-- 注意:只有配置 hibernate.hbm2ddl.auto 为 update,才能自动创建表 --> <property name="hibernate.hbm2ddl.auto">update</property> <property name="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.****.net/maoyuanming0806/article/details/61417995 --> <property name="hibernate.current_session_context_class"> org.springframework.orm.hibernate5.SpringSessionContext </property> <mapping resource="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:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="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 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="com.mysql.jdbc.Driver"/> <!-- jdbc:mysql:///test_db 是 jdbc:mysql://localhost:3306/test_db 的简写 --> <property name="jdbcUrl" value="jdbc:mysql:///test_db"/> <property name="user" value="root"/> <property name="password" value="8888"/> </bean> <!-- SessionFactory 对象的创建交给 Spring 进行管理 --> <bean id="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 --> <property name="dataSource" ref="dataSource"></property> <!-- 指定 Hibernate 核心配置文件的位置 --> <property name="configLocations" value="classpath:hibernate.cfg.xml"></property> </bean> <!-- (2) --> <!-- 配置 Action 对象 --> <bean id="userAction" class="com.siwuxie095.action.UserAction" scope="prototype"> <property name="userService" ref="userService"></property> </bean> <!-- 配置 Service 对象 --> <bean id="userService" class="com.siwuxie095.service.UserService"> <property name="userDao" ref="userDaoImpl"></property> </bean> <!-- 配置 Dao 实现类对象 --> <bean id="userDaoImpl" class="com.siwuxie095.dao.impl.UserDaoImpl"> <property name="hibernateTemplate" ref="hibernateTemplate"></property> </bean> <!-- 配置 HibernateTemplate 对象 --> <bean id="hibernateTemplate" class="org.springframework.orm.hibernate5.HibernateTemplate"> <!-- 注入 SessionFactory 对象 --> <property name="sessionFactory" ref="sessionFactory"></property> </bean> <!-- (3) --> <!-- 配置事务管理器 HibernateTransactionManager --> <bean id="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager"> <!--注入 SessionFactory 对象 --> <property name="sessionFactory" ref="sessionFactory"></property> </bean> <!-- 开启事务注解 --> <tx:annotation-driven transaction-manager="transactionManager"/> </beans> |
(8)在 Struts2 核心配置文件中进行配置
struts.xml:
<?xml version="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> <package name="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 --> <action name="user" class="userAction"></action> </package> </struts> |
(9)在部署描述文件中进行配置
web.xml:
<?xml version="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】