spring事务转账案例

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
<!-- https://mvnrepository.com/artifact/c3p0/c3p0 -->
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>

create table account(
id int primary key auto_increment,
username varchar(50),
money int
);
insert into account(username,money) values('jack','10000');
insert into account(username,money) values('rose','10000');

public interface AccountDao {
public void out(String outer,Integer money);
public void in(String inner,Integer money);
}

//继承JdbcDaoSupport
public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao{
public void out(String outer, Integer money) {
this.getJdbcTemplate().update("update account set money = money - ? where username = ?", money,outer);
}

public void in(String inner, Integer money) {
this.getJdbcTemplate().update("update account set money = money + ? where username = ?", money,inner);
}
}

public interface Service {
public void transfer(String outer,String inner,Integer money);
}
public class ServiceImpl implements Service {
private AccountDao accountDao;

public void setAccountDao(AccountDao accountDao) {
this.accountDao = accountDao;
}

private TransactionTemplate transactionTemplate;

public void setTransactionTemplate(TransactionTemplate transactionTemplate) {
this.transactionTemplate = transactionTemplate;
}

public void transfer(final String outer,final String inner,final Integer money) {
transactionTemplate.execute(
new TransactionCallbackWithoutResult() {
@Override
protected void doInTransactionWithoutResult(TransactionStatus status) {
accountDao.in(inner,money);
accountDao.out(outer,money);
}
}
);
}
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/db"></property>
<property name="user" value="root"></property>
<property name="password" value="XXX"></property>
</bean>
<bean id="accountDao" class="springtx.AccountDaoImpl">
<property name="dataSource" ref="dataSource"></property>
</bean>
<bean id="service" class="springtx.ServiceImpl">
<property name="accountDao" ref="accountDao"></property>
<property name="transactionTemplate" ref="transactionTemplate"></property>
</bean>
<bean id="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate">
<property name="transactionManager" ref="txManager"></property>
</bean>
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
</beans>

public class Test {
@org.junit.jupiter.api.Test
public void demo(){
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
Service service = (Service) applicationContext.getBean("service");
service.transfer("jack", "rose", 1000);
}
}