Spring4学习(四)Spring4中整合Hibernate4
程序员文章站
2022-07-12 16:14:36
...
Spring4.2.8版本官方文档说明,这一版本的Spring强烈建议使用Hibernate5,而且Hibernate3.6版本以上才支持,低版本的Hibernate只好选择与之相适应的Spring版本,此例中采用Hibernate4.3.11版本。
Hibernate配置文件,由于使用Spring,数据库连接池等配置可以有选择配置到spring文件中,这样Hibernate配置文件就可以尽可能简化。
<?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> <!-- SQL dialect --> <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property> <!-- Enable Hibernate's automatic session context management --> <property name="current_session_context_class">thread</property> <!-- <property name="current_session_context_class">jta</property> --> <!-- Disable the second-level cache --> <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> <!-- Drop and re-create the database schema on startup --> <property name="hbm2ddl.auto">update</property> <!-- maping 可以在spring中配置 --> <!-- <mapping resource="conf/hibernate/domain/Music.hbm.xml"/> --> <!-- <mapping class="org.lian.domain.Group" /> --> </session-factory> </hibernate-configuration>
需要指出的是上面的hibernate配置文件是可选的,可以完全将配置文件内容配置到spring文件。
Spring配置文件 分两步配置 第一配置数据源 第二配置SessionFactory
<?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:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- 使用spring注解 --> <!-- <context:annotation-config/> --> <!-- 下面的配置告诉spring容器自动scanner用注解标注bean --> <context:component-scan base-package="org.lian"/> <!--配置数据源 --> <!-- <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="${jdbc.driverClassName}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </bean> --> <!-- 配置Druid数据库连接池 --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <!-- 基本属性 url、user、password --> <property name="driverClassName" value="${jdbc.driverClassName}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> <!-- 配置初始化大小、最小、最大 --> <property name="initialSize" value="1" /> <property name="minIdle" value="1" /> <property name="maxActive" value="20" /> <!-- 配置获取连接等待超时的时间 --> <property name="maxWait" value="60000" /> <!-- 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒 --> <property name="timeBetweenEvictionRunsMillis" value="60000" /> <!-- 配置一个连接在池中最小生存的时间,单位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="300000" /> <property name="validationQuery" value="SELECT 'x'" /> <property name="testWhileIdle" value="true" /> <property name="testOnBorrow" value="false" /> <property name="testOnReturn" value="false" /> <!-- 打开PSCache,并且指定每个连接上PSCache的大小 --> <property name="poolPreparedStatements" value="true" /> <property name="maxPoolPreparedStatementPerConnectionSize" value="20" /> <!-- 配置监控统计拦截的filters,去掉后监控界面sql无法统计 --> <property name="filters" value="stat" /> </bean> <!-- 配置Hibernate SessionFactory --> <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean" lazy-init="false"> <!-- 注入datasource,给sessionfactoryBean内setdatasource提供数据源 --> <property name="dataSource" ref="dataSource"/> <property name="configLocation" value="classpath:conf/hibernate/hibernate.cfg.xml"></property> <!-- //加载实体类的映射文件位置及名称 --> <property name="mappingLocations" value="classpath:conf/hibernate/domain/*.hbm.xml"></property> <property name="packagesToScan" value="org.lian.**.domain"></property> </bean> <context:property-placeholder location="classpath*:conf/datasource/jdbc.properties"/> </beans>
Dao层中使用SessionFactory
@Repository("musicH4Dao") public class MusicH4DaoImpl implements MusicDao { @Autowired private SessionFactory sessionFactory; @Override public String get(Music music) { Session session = sessionFactory.openSession(); try { String sql = "from Music as music where music.id = :id "; Music bean = (Music) session.createQuery(sql) .setParameter("id", music.getId()).uniqueResult(); return GsonUtil.getInstance().convertToJson(bean); } finally { session.close(); } } @Override public String list(Music music) { String sql = "from Group as group where group.id = :id "; Session session = sessionFactory.openSession(); try { @SuppressWarnings("unchecked") List<Group> list = session.createQuery(sql) .setParameter("id", music.getId()).list(); return GsonUtil.getInstance().convertToJson(list); } finally { session.close(); } } }
测试代码
public class Main { public static void main(String[] args) { String classPath = "classpath*:conf/spring/app_hibernate.xml"; ApplicationContext context = new ClassPathXmlApplicationContext(classPath); MusicDao dao = context.getBean("musicH4Dao", MusicDao.class); Music music = new Music(); music.setId("123"); System.out.println(dao.get(music)); music.setId("297ed3f359058806015905880d110000"); System.out.println(dao.list(music)); } }
上一篇: springboot+thymeleaf前后端联调笔记
下一篇: struts2防重复提交