Day23SSM之Spring事务Xml***

Spring事务管理-准备工作

• （1）spring的事务实现方式:
  1.编程式事务管理
  2.声明式事务管理 (使用aop xml 或注解的配置即可实现事务管理)
• （2）准备数据库
• （3）POM.xml

sql

create database day23db ;
use day23db;
create table `account` (
  `id` int(8) not null  primary key auto_increment,
  `name` varchar(64) default null,
  `money` double default null
) 

insert into account values(null,'jack',1000);
insert into account values(null,'rose',1000);

# 转账
update account set money=money-500 where `name`='jack';
update account set money=money+500 where `name`='rose';

pom.xml

   <dependencies>
        
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <version>5.1.46version>
        dependency>
        
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-contextartifactId>
            <version>5.2.9.RELEASEversion>
        dependency>
        
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-jdbcartifactId>
            <version>5.2.9.RELEASEversion>
        dependency>
        
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-testartifactId>
            <version>5.2.9.RELEASEversion>
        dependency>
        <dependency>
            <groupId>junitgroupId>
            <artifactId>junitartifactId>
            <version>4.12version>
        dependency>
       
        <dependency>
            <groupId>org.aspectjgroupId>
            <artifactId>aspectjweaverartifactId>
            <version>1.7.2version>
        dependency>
    dependencies>

编写TestAccountService

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class TestAccountServiceImpl {
    @Autowired
    IAccountService service ;
    @Test
    public void test01(){
        //业务对象
        //IAccountService service = new AccountServiceImpl();
        //调用方法 translate(一个人转出，另一个转入，金额)
        service.translate("jack","rose",500.00);
    }
}

AccountServiceImpl

@Service
public class AccountServiceImpl implements IAccountService{
    @Autowired
    IAccountDao dao ;

    @Override
    public void translate(String from, String to, double money) {
        //创建AccountDaoImpl
        //AccountDaoImpl dao = new AccountDaoImpl();
        //调用方法
        dao.translateOut(from,money);
        System.out.println(1/0); //断电
        dao.translateIn(to,money);
        System.out.println("--translate");
    }
}

IAccountService

public interface IAccountService {
    //转账本身就是从一个账户减钱，另一个账户加钱
    void translate(String from, String to, double money);
}

AccountDaoImpl

@Repository
public class AccountDaoImpl implements IAccountDao {
    @Autowired
    JdbcTemplate jdbcTemplate;
    @Override
    public void update(String account, double v) {
       System.out.println(account+" "+v);
       jdbcTemplate.update("update account set money=money+? where `name`=?",v,account);
    }

    @Override
    public void translateOut(String account, double v) {
        jdbcTemplate.update("update account set money=money-? where `name`=?",v,account);
    }

    @Override
    public void translateIn(String account, double v) {
        jdbcTemplate.update("update account set money=money+? where `name`=?",v,account);
    }
}

IAccountDao

public interface IAccountDao {
    @Deprecated
    void update(String account, double v);
    void translateOut(String account, double v);
    void translateIn(String account, double v);
}

applicationContext.xml

<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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

    
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="url" value="jdbc:mysql://localhost:3306/day23db"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    bean>
    
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <constructor-arg name="dataSource" ref="dataSource"/>
    bean>

    
    <context:component-scan base-package="com.wzx"/>

    
    <aop:aspectj-autoproxy/>

beans>

Spring事务管理-转账-没有事务

AccountServiceImpl中 transfer 方法中 int i = 1/0; 发现问题,转出成功. 转入失败,没有收到事务控制,数据前后不一致.

Spring事务管理-转账-xml事务

解决方式是使用spring基于xml的事务管理.
步骤:
一.在bean.xml中配置3个内容
1.配置平台事务管理器(注入dataSource)
2.编写一个tx:Advice 设置事务的增强
3.配置aop (配置切点, 切点和增强的组合);

添加tx

因为要使用tx标签

<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: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/context
         http://www.springframework.org/schema/context/spring-context.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Tx

    
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    bean>

    
    
    <tx:advice id="adviceId" transaction-manager="transactionManager">
        <tx:attributes>
            
            <tx:method name="translate" isolation="REPEATABLE_READ"  propagation="REQUIRED" read-only="false" timeout="-1" />
        tx:attributes>
    tx:advice>

    <aop:config>
        <aop:pointcut id="translate" expression="execution(* com.wzx.service.AccountServiceImpl.translate(..))"/>
        <aop:advisor advice-ref="adviceId" pointcut-ref="translate"/>
    aop:config>
beans>