(1) Declarative transaction control, configuration mode implementation
<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: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/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<!-- 配置业务层-->
<bean id="accountService" class="com.itheima.service.impl.AccountServiceImpl">
<property name="accountDao" ref="accountDao"></property>
</bean>
<!-- 配置账户的持久层-->
<bean id="accountDao" class="com.itheima.dao.impl.AccountDaoImpl">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 配置数据源-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql://localhost:3306/eesy"></property>
<property name="username" value="root"></property>
<property name="password" value="1234"></property>
</bean>
<!--spring中基于xml的声明式事务控制配置步骤
1、配置事务管理器,注入数据源
2、配置事务的通知,需要导入事务的约束
配置事务的通知标签:tx:advice,tx名称空间和约束,同时也需要aop的
使用tx:advice标签配置事务通知,属性
id:给事务通知起一个唯一标识
transaction-Manager:给事务通知提供一个事务管理器引用
3、配置aop中的通用切入点表达式
4、建立切入点表达式和事务通知的对应关系
5、配置事务的属性
在事务的通知tx:advice标签内部
isolation="" :事务的隔离级别,默认值是DEFAULT,表示使用数据库的默认隔离级别
propagation="" :事务的传播行为,默认值是REQUIRED,表示一定会有事务,增删改的选择,查询方法可以选择SUPPORTS
read-only="" :事务是否只读,只有查询方法才能设置为true,默认值是false,表示读写
timeout="":事务的超时时间,默认值是-1,表示永不超时,如果指定了数值,以秒为单位
rollback-for="" :指定一个异常,当该异常发生时,事务回滚,产生其他异常时,事务不回滚。没有默认值,表示任何异常都回滚
no-rollback-for="" :与rollback-for=""相反,指定一个异常,当该异常发生时,事务不回滚,产生其他异常时,事务回滚,没有默认值,表示任何异常都回滚
-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<!--事务的属性-->
<tx:attributes>
<tx:method name="transfer" propagation="REQUIRED" read-only="false"/>
<tx:method name="*" propagation="REQUIRED" read-only="false"></tx:method>
<!--name="*":表示所有的方法都使用一样的事务,对于查询不适用,可以使用以下方法-->
<tx:method name="find*" propagation="REQUIRED" read-only="true"></tx:method>
<!--name="find*"优先级高于name="*",以后查询方法可以考虑使用find开头-->
</tx:attributes>
</tx:advice>
<!--aop-->
<aop:config>
<!--切入点表达式-->
<aop:pointcut id="pt1" expression="execution(* com.itheima.service.impl.*.*(..))"/>
<!--建立切入点表达式和事务通知的对应关系-->
<aop:advisor advice-ref="txAdvice" pointcut-ref="pt1"></aop:advisor>
</aop:config>
(2) Declarative transaction control based on annotations
<!--配置自动扫描的包--> <context:component-scan base-package="com.itheima"></context:component-scan> <!--配置jdbcTemplate--> <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSource"></property> </bean>
<!-- Configuration data source--> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver"> </property> <property name="url" value="jdbc:mysql://localhost:3306/eesy"></property> <property name="username" value="root"></property> <property name="password" value="1234"></property> </bean> <!---Annotation-based declarative transaction control configuration steps in spring 1. Configure transaction manager, inject data source 2. Turn on spring annotation Transaction support tx:annotation-driven 3. Use @Transactional annotations where transaction support is needed --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"></property> </bean> <!--Enable spring support for annotation transactions--> <tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>
@Repository("accountDao") public class AccountDaoImpl implements IAccountDao {//Remove extends JdbcDaoSupport, write jdbcTemplate yourself //You need to configure jdbcTemplate in bean.xml @Autowired private JdbcTemplate jdbcTemplate;
@Service("accountService") //只读型事务配置 @Transactional(propagation = Propagation.SUPPORTS,readOnly = true) public class AccountServiceImpl implements IAccountService{ @Autowired private IAccountDao accountDao; // public void setAccountDao(IAccountDao accountDao) { // this.accountDao = accountDao; // }
//Requires read-write transaction configuration @Transactional(propagation = Propagation.REQUIRED,readOnly = false) @Override public Account findAccountById(Integer accountId) { return accountDao.findAccountById(accountId); }
Test class
@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = "classpath:bean.xml") public class AccountServiceTest {
@Autowired private IAccountService as;