可以做个对比
Spring 管理事务特有的属性:
事务传播行为: 事务传播行为 (propagation behavior) 指的就是当一个事务方法被另一个事务方法调用时, 这个事务方法应该如何进行
例如: methodA 事务方法调用 methodB 事务方法时, methodB 是继续在调用者 methodA 的事务中运行呢, 还是为自己开启一个新事务运行, 这就是由 methodB 的事务传播行为决定的
1PROPAGATION_REQUIRED: 如果当前没有事务, 就创建一个新事务, 如果当前存在事务, 就加入该事务, 该设置是最常用的设置
2PROPAGATION_SUPPORTS: 支持当前事务, 如果当前存在事务, 就加入该事务, 如果当前不存在事务, 就以非事务执行
3PROPAGATION_MANDATORY: 支持当前事务, 如果当前存在事务, 就加入该事务, 如果当前不存在事务, 就抛出异常
4PROPAGATION_REQUIRES_NEW: 创建新事务, 无论当前存不存在事务, 都创建新事务
5PROPAGATION_NOT_SUPPORTED: 以非事务方式执行操作, 如果当前存在事务, 就把当前事务挂起
6PROPAGATION_NEVER: 以非事务方式执行, 如果当前存在事务, 则抛出异常
7PROPAGATION_NESTED: 如果当前存在事务, 则在嵌套事务内执行如果当前没有事务, 则执行与 PROPAGATION_REQUIRED 类似的操作
接下来演示事务案例: 简单模拟转账
需要的包:
新建一张表, 放入数据:
- package dao;
- public interface AccountDao {
- // 加钱
- void increaseMoney(Integer id,Double money);
- // 减钱
- void decreaseMoney(Integer id,Double money);
- }
- package dao;
- import org.springframework.jdbc.core.support.JdbcDaoSupport;
- public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao {
- @Override
- public void increaseMoney(Integer id, Double money) {
- getJdbcTemplate().update("update t_account set money = money+? where id = ?", money,id);
- }
- @Override
- public void decreaseMoney(Integer id, Double money) {
- getJdbcTemplate().update("update t_account set money = money-? where id = ?", money,id);
- }
- }
- package service;
- public interface AccountService {
- // 转账方法
- void transfer(Integer from,Integer to,Double money);
- }
- package service;
- import dao.AccountDao;
- public class AccountServiceImpl implements AccountService {
- private AccountDao ad;
- @Override
- public void transfer(final Integer from, final Integer to, final Double money) {
- // 减钱
- ad.decreaseMoney(from, money);
- // 加钱
- ad.increaseMoney(to, money);
- }
- public void setAd(AccountDao ad) {
- this.ad = ad;
- }
- }
- package tx;
- import javax.annotation.Resource;
- import org.junit.Test;
- import org.junit.runner.RunWith;
- import org.springframework.test.context.ContextConfiguration;
- import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
- import service.AccountService;
- @RunWith(SpringJUnit4ClassRunner.class)
- @ContextConfiguration("classpath:applicationContext.xml")
- public class Demo {
- @Resource(name="accountService")
- private AccountService as;
- @Test
- public void fun1(){
- as.transfer(1, 2, 100d);
- }
- }
配置文件:
- <?xml version="1.0" encoding="UTF-8"?>
- <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" 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-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd">
- <!-- 指定 spring 读取 db.properties 配置 -->
- <context:property-placeholder location="classpath:db.properties" />
- <!-- 事务核心管理器, 封装了所有事务操作. 依赖于连接池 -->
- <bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" >
- <property name="dataSource" ref="dataSource" ></property>
- </bean>
- <!-- 配置事务通知 -->
- <tx:advice id="txAdvice" transaction-manager="transactionManager" >
- <tx:attributes>
- <!-- 以方法为单位, 指定方法应用什么事务属性
- isolation: 隔离级别
- propagation: 传播行为
- read-only: 是否只读
- 其他方法的配置没有用到, 但它们通常是统一配置
- -->
- <tx:method name="save*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" />
- <tx:method name="persist*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" />
- <tx:method name="update*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" />
- <tx:method name="modify*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" />
- <tx:method name="delete*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" />
- <tx:method name="remove*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" />
- <tx:method name="get*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="true" />
- <tx:method name="find*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="true" />
- <tx:method name="transfer" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" />
- </tx:attributes>
- </tx:advice>
- <!-- 配置织入 -->
- <aop:config >
- <!-- 配置切点表达式 -->
- <aop:pointcut expression="execution(* service.*ServiceImpl.*(..))" id="txPc"/>
- <!-- 配置切面 : 通知 + 切点
- advice-ref: 通知的名称
- pointcut-ref: 切点的名称
- -->
- <aop:advisor advice-ref="txAdvice" pointcut-ref="txPc" />
- </aop:config>
- <!-- 1. 将连接池 -->
- <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
- <property name="jdbcUrl" value="${jdbc.jdbcUrl}" ></property>
- <property name="driverClass" value="${jdbc.driverClass}" ></property>
- <property name="user" value="${jdbc.user}" ></property>
- <property name="password" value="${jdbc.password}" ></property>
- </bean>
- <!-- 2.Dao-->
- <bean name="accountDao" class="dao.AccountDaoImpl" >
- <property name="dataSource" ref="dataSource" ></property>
- </bean>
- <!-- 3.Service-->
- <bean name="accountService" class="service.AccountServiceImpl" >
- <property name="ad" ref="accountDao" ></property>
- </bean>
- </beans>
- db.properties
- jdbc.jdbcUrl=jdbc:mysql:///mybase
- jdbc.driverClass=com.mysql.jdbc.Driver
- jdbc.user=root
- jdbc.password=xuyiqing
运行 Demo 后结果:
转账成功!
补充:
可以采用注解方式代替 XML 配置文件:
配置文件只要一行即可:
- <?xml version="1.0" encoding="UTF-8"?>
- <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" 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-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd">
- <!-- 指定 spring 读取 db.properties 配置 -->
- <context:property-placeholder location="classpath:db.properties" />
- <!-- 事务核心管理器, 封装了所有事务操作. 依赖于连接池 -->
- <bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" >
- <property name="dataSource" ref="dataSource" ></property>
- </bean>
- <!-- 事务模板对象 -->
- <bean name="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate" >
- <property name="transactionManager" ref="transactionManager" ></property>
- </bean>
- <!-- 开启使用注解管理 aop 事务 -->
- <tx:annotation-driven/>
- <!-- 1. 将连接池 -->
- <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
- <property name="jdbcUrl" value="${jdbc.jdbcUrl}" ></property>
- <property name="driverClass" value="${jdbc.driverClass}" ></property>
- <property name="user" value="${jdbc.user}" ></property>
- <property name="password" value="${jdbc.password}" ></property>
- </bean>
- <!-- 2.Dao-->
- <bean name="accountDao" class="dao.AccountDaoImpl" >
- <property name="dataSource" ref="dataSource" ></property>
- </bean>
- <!-- 3.Service-->
- <bean name="accountService" class="service.AccountServiceImpl" >
- <property name="ad" ref="accountDao" ></property>
- </bean>
- </beans>
- package service;
- import org.springframework.transaction.annotation.Isolation;
- import org.springframework.transaction.annotation.Propagation;
- import org.springframework.transaction.annotation.Transactional;
- import dao.AccountDao;
- @Transactional(isolation = Isolation.REPEATABLE_READ, propagation = Propagation.REQUIRED, readOnly = true)
- public class AccountServiceImpl implements AccountService {
- private AccountDao ad;
- @Override
- @Transactional(isolation = Isolation.REPEATABLE_READ, propagation = Propagation.REQUIRED, readOnly = false)
- public void transfer(final Integer from, final Integer to, final Double money) {
- // 减钱
- ad.decreaseMoney(from, money);
- // 加钱
- ad.increaseMoney(to, money);
- }
- public void setAd(AccountDao ad) {
- this.ad = ad;
- }
- }
来源: http://www.bubuko.com/infodetail-2505797.html