Java Spring 声明式事务详解
作者:philpy_used
这篇文章主要介绍了spring 声明式事务实现过程解析,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
项目结构:
表结构:
基于xml的声明式事务配置
IAccountDao.java:
package tx.dao; import java.math.BigDecimal; public interface IAccountDao { void add(String name, BigDecimal money); void sub(String name, BigDecimal money); }
AccountDaoImpl.java:
package tx.service.impl; import tx.dao.IAccountDao; import tx.service.IAccountService; import java.math.BigDecimal; public class AccountServiceImpl implements IAccountService { private IAccountDao accountDao; public void setAccountDao(IAccountDao accountDao) { this.accountDao = accountDao; } @Override public void tran(String from, String to, BigDecimal money) { accountDao.sub(from, money); accountDao.add(to, money); } }
IAccountService.java:
package tx.service; import java.math.BigDecimal; public interface IAccountService { void tran(String from, String to, BigDecimal money); }
AccountDaoImpl.java:
package tx.dao.impl; import org.springframework.jdbc.core.JdbcTemplate; import tx.dao.IAccountDao; import java.math.BigDecimal; public class AccountDaoImpl implements IAccountDao { private JdbcTemplate jdbcTemplate; public void setJdbcTemplate(JdbcTemplate jdbcTemplate) { this.jdbcTemplate = jdbcTemplate; } @Override public void add(String name, BigDecimal money) { jdbcTemplate.update("update account set balance = balance + ? where name = ? ", money.toString(), name); } @Override public void sub(String name, BigDecimal money) { jdbcTemplate.update("update account set balance = balance - ? where name = ? ", money.toString(), name); } }
<?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:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" 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 "> <!--配置数据源--> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close"> <property name="url" value="jdbc:mysql://localhost:3306/test?useSSL=false"/> <property name="username" value="root"/> <property name="password" value="19834044876"/> <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/> </bean> <!--创建事务管理器--> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <!--注入数据源--> <property name="dataSource" ref="dataSource"/> </bean> <!--配置jdbcTemplate对象--> <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <!--注入dataSource--> <property name="dataSource" ref="dataSource"/> </bean> <!--将JdbcTemplate注入到AccountDao中--> <bean id="accountDao" class="tx.dao.impl.AccountDaoImpl"> <property name="jdbcTemplate" ref="jdbcTemplate"/> </bean> <!--将AccountDao注入到AccountService中--> <bean id="accountService" class="tx.service.impl.AccountServiceImpl"> <property name="accountDao" ref="accountDao"/> </bean> <!--配置事务通知--> <tx:advice id="txAdvice"> <!--配置事务参数--> <tx:attributes> <!--指定哪些方法上面添加事务--> <tx:method name="tran"/> <!-- name="*", name="tran*", name="*tran", ... --> </tx:attributes> </tx:advice> <!--配置切入点和切面--> <aop:config> <!--配置切入点--> <aop:pointcut id="pointCut" expression="execution(* tx.service.IAccountService.*(..))"/> <!--配置通知--> <aop:advisor advice-ref="txAdvice" pointcut-ref="pointCut"/> </aop:config> </beans>
ApplicationContext context = new ClassPathXmlApplicationContext("tx.xml"); IAccountService accountService = context.getBean("accountService", IAccountService.class); accountService.tran("小明", "小红", new BigDecimal(500));
完全注解(零xml)方式配置
IAccountDao.java:
package tx.dao; import java.math.BigDecimal; public interface IAccountDao { void add(String name, BigDecimal money); void sub(String name, BigDecimal money); }
AccountDaoImpl.java:
package tx.dao.impl; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.stereotype.Repository; import tx.dao.IAccountDao; import java.math.BigDecimal; @Repository public class AccountDaoImpl implements IAccountDao { @Autowired private JdbcTemplate jdbcTemplate; @Override public void add(String name, BigDecimal money) { jdbcTemplate.update("update account set balance = balance + ? where name = ? ", money.toString(), name); } @Override public void sub(String name, BigDecimal money) { jdbcTemplate.update("update account set balance = balance - ? where name = ? ", money.toString(), name); } }
IAccountService.java:
package tx.service; import java.math.BigDecimal; public interface IAccountService { void tran(String from, String to, BigDecimal money); }
AccountServiceImpl.java:
package tx.service.impl; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import tx.dao.IAccountDao; import tx.service.IAccountService; import java.math.BigDecimal; @Service @Transactional public class AccountServiceImpl implements IAccountService { @Autowired private IAccountDao accountDao; @Override public void tran(String from, String to, BigDecimal money) { accountDao.sub(from, money); accountDao.add(to, money); } }
TXConfig.java
package tx.config; import com.alibaba.druid.pool.DruidDataSource; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.jdbc.datasource.DataSourceTransactionManager; import org.springframework.transaction.annotation.EnableTransactionManagement; import tx.service.IAccountService; import tx.service.impl.AccountServiceImpl; import javax.sql.DataSource; @Configuration @ComponentScan(basePackages = "tx") @EnableTransactionManagement public class TXConfig { /** * 配置数据源 */ @Bean public DataSource getDataSource() { DruidDataSource dataSource = new DruidDataSource(); dataSource.setUrl("jdbc:mysql://localhost:3306/test?useSSL=false"); dataSource.setUsername("root"); dataSource.setPassword("19834044876"); dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver"); return dataSource; } /** * 创建事务管理器 */ @Bean public DataSourceTransactionManager getTransactionManager() { return new DataSourceTransactionManager(getDataSource()); } /** * 配置jdbcTemplate对象 */ @Bean public JdbcTemplate getJdbcTemplate() { return new JdbcTemplate(getDataSource()); } @Bean(name = "accountService") public IAccountService getAccountService() { return new AccountServiceImpl(); } }
ApplicationContext context = new AnnotationConfigApplicationContext(TXConfig.class); IAccountService accountService = context.getBean("accountService", IAccountService.class); accountService.tran("小明", "小红", new BigDecimal(500));
事务参数
no-rollback-for
指定碰到哪些异常不需要回滚
rollback-for
指定碰到哪些异常需要回滚
read-only
设置事务为只读事务
timeout
以秒为单位,设置事务超出指定时常后自动回滚
默认为-1,即不管事务运行多久都不回滚
isolation
事务的隔离级别
默认为DEFAULT,即使用当前数据库的隔离级别
propagation
事务的传播行为
默认为REQUIRED
总结
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