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1,Spring 指定datasource
a) 参考文档,找dbcp.BasicDataSource(3种方式)
c3p0 dbcp ( 数据库连接池) proxool
b) 在DAO或者Service中注入dataSource
@Component("u") public class UserDAOImpl implements UserDAO { private DataSource dataSource; public DataSource getDataSource() { return dataSource; } @Resource public void setDataSource(DataSource dataSource) { this.dataSource = dataSource; } public void save(User user) { try { Connection connection=dataSource.getConnection(); connection.createStatement().execute("insert into user values(null,‘zhangsan‘)"); connection.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println("user saved"); } }
c) 在Spring中可以使用PropertyPlaceHolderConfigure来读取Properties文件的内容
<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" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"> <context:annotation-config /> <context:component-scan base-package="com.bjsxt" /> <!-- <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://localhost:3306/spring" /> <property name="username" value="root" /> <property name="password" value="123456" /> </bean> --> <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <value>classpath:jdbc.properties</value> </property> </bean> <bean id="dataSource" destroy-method="close" class="org.apache.commons.dbcp.BasicDataSource"> <property name="driverClassName" value="${jdbc.driverClassName}" /> <!-- $占位符--> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> </bean> </beans>
2,Spring整合Hibernate
a) <bean .. AnnotationSessionFactoryBean>
i. <property dataSource
ii. <annotatedClasses
<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" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"> <context:annotation-config /> <context:component-scan base-package="com.bjsxt" /> <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <value>classpath:jdbc.properties</value> </property> </bean> <bean id="dataSource" destroy-method="close" class="org.apache.commons.dbcp.BasicDataSource"> <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> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="annotatedClasses"> <list> <value>com.bjsxt.model.User</value><!--那些类进行了注解--> </list> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect"> org.hibernate.dialect.MySQLDialect </prop> <prop key="hibernate.show_sql">true</prop> </props> </property> </bean> </beans>
b) 引入hibernate 系列jar包
c) User上加Annotation
@Entity public class User { private int id; private String name; @Id @GeneratedValue public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
d) UserDAO或者UserServie 注入SessionFactory
@Component("u") public class UserDAOImpl implements UserDAO { private SessionFactory sessionFactory; public SessionFactory getSessionFactory() { return sessionFactory; } @Resource public void setSessionFactory(SessionFactory sessionFactory) { this.sessionFactory = sessionFactory; } public void save(User user) { System.out.println("session factory class:" + sessionFactory.getClass()); Session s = sessionFactory.openSession(); s.beginTransaction(); s.save(user); s.getTransaction().commit(); System.out.println("user saved!"); } }
e) jar包问题一个一个解决
3,声明式的事务管理
a) 事务加在DAO层还是Service层?(service)
b) annotation
i. 加入annotation.xsd
ii. 加入txManager bean
iii. <tx:annotation-driven
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <value>classpath:jdbc.properties</value> </property> </bean> <bean id="dataSource" destroy-method="close" class="org.apache.commons.dbcp.BasicDataSource"> <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> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="annotatedClasses"> <list> <value>com.bjsxt.model.User</value> <value>com.bjsxt.model.Log</value> </list> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect"> org.hibernate.dialect.MySQLDialect </prop> <prop key="hibernate.show_sql">true</prop> </props> </property> </bean> <bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory" /> </bean> <tx:annotation-driven transaction-manager="txManager"/> </beans>
iv. 在需要事务的方法上加:@Transactional
@Component("userService") public class UserService { private UserDAO userDAO; private LogDAO logDAO; public void init() { System.out.println("init"); } @Transactional public void add(User user) { userDAO.save(user); Log log=new Log(); log.setMsg("a user add"); logDAO.save(log); } public UserDAO getUserDAO() { return userDAO; } public LogDAO getLogDAO() { return logDAO; } @Resource public void setLogDAO(LogDAO logDAO) { this.logDAO = logDAO; } @Resource(name="u") public void setUserDAO( UserDAO userDAO) { this.userDAO = userDAO; } public void destroy() { System.out.println("destroy"); } }
v. 需要注意,Hibernate获得session时要使用SessionFactory.getCurrentSession 不能使用OpenSession
@Component("u") public class UserDAOImpl implements UserDAO { private SessionFactory sessionFactory; public SessionFactory getSessionFactory() { return sessionFactory; } @Resource public void setSessionFactory(SessionFactory sessionFactory) { this.sessionFactory = sessionFactory; } public void save(User user) { Session s = sessionFactory.getCurrentSession(); s.beginTransaction(); s.save(user); } }
c) @Transactional详解
i. 什么时候rollback
例如: @Transactional(propagation=Propagation.REQUIRED)等同于(@Transactional)
作用,一个方法声明了@Transactional事务后,其内再调用的方法不需要再声明@Transactional.
ii.read_only
例如: @Transactional(propagation=Propagation.REQUIRED,readOnly=true)
当方法声明readOnly=true时,该方法及其调用的方法内都不执行insert update等
d) xml(推荐,可以同时配置好多方法)
i. <bean txmanager
ii. <aop:config
<aop:pointcut
<aop:advisor pointcut-ref advice-ref
iii. <tx:advice: id transaction-manager =
<bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory" /> </bean> <tx:advice id="txAdvice" transaction-manager="txManager"> <!-- the transactional semantics... --> <tx:attributes> <!-- all methods starting with ‘get‘ are read-only --> <tx:method name="get*" read-only="true" /> <!-- other methods use the default transaction settings (see below) --> <tx:method name="add*" /> </tx:attributes> </tx:advice> <aop:config> <aop:pointcut id="businessService" expression="execution(public * com.bjsxt.service..*.*(..))" /> <aop:advisor advice-ref="txAdvice" pointcut-ref="businessService" /> </aop:config>
iv. <property name="packagesToScan"> 可定义扫描目标包下所有实体类
<property name="packagesToScan"> <value>com.bjsxt.model</value> </property>
d) HibernateTemplate、HibernateCallback、HibernateDaoSupport(不重要)介绍
i. 设计模式:Template Method(模板方法)
ii. Callback:回调/钩子函数
iii. 第一种:(建议)
1,在spring中初始化HibernateTemplate,注入sessionFactory
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate"> <property name="sessionFactory" ref="sessionFactory"></property> </bean>
2, DAO里注入HibernateTemplate
@Component("u") public class UserDAOImpl implements UserDAO { private HibernateTemplate hibernateTemplate; public HibernateTemplate getHibernateTemplate() { return hibernateTemplate; } @Resource public void setHibernateTemplate(HibernateTemplate hibernateTemplate) { this.hibernateTemplate = hibernateTemplate; } public void save(User user) { hibernateTemplate.save(user); //throw new RuntimeException("exeption!"); } }
3,save写getHibernateTemplate.save();
iv. 第二种:
例如:
首先,新建SuperDAOImpl类(使用Annotation注入--@Component):
@Component public class SuperDAOImpl { private HibernateTemplate hibernateTemplate; //此处定义由spring注入管理 public HibernateTemplate getHibernateTemplate() { return hibernateTemplate; } @Resource public void setHibernateTemplate(HibernateTemplate hibernateTemplate) { this.hibernateTemplate = hibernateTemplate; } }
此时,xml中必须要有:
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate"> <property name="sessionFactory" ref="sessionFactory" /> </bean>
或者,SuperDAOImpl类写成下面代码:
@Component public class SuperDAOImpl extends HibernateDaoSupport { @Resource(name="sessionFactory") public void setSuperHibernateTemplate(SessionFactory sessionFactory) { super.setSessionFactory(sessionFactory); } }
对应的xml中则可省略
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate"> <property name="sessionFactory" ref="sessionFactory" /> </bean>
只要包含
<bean id="sessionFactory"……..部分即可
最后,其他类继承SuperDaoImpl类后便可直接使用HibernateTemplate
@Component("u") public class UserDAOImpl extends SuperDAOImpl implements UserDAO { public void save(TestUser testUser) { this.getHibernateTemplate().save(testUser); } }
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原文地址:http://www.cnblogs.com/enjoy-life-clh/p/4251553.html