spring基于注解的声明式事务控制配置

Posted 2021-03-11 lijiahaoAA

配置文件：

<?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:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/tx
        https://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">

    <!--配置spring创建容器时需要扫描的包-->
    <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>

    <!--配置数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/eesy?serverTimezone=Asia/Shanghai&amp;characterEncoding=utf8&amp;useSSL=false"></property>
        <property name="username" value="root"></property>
        <property name="password" value="123456"></property>
    </bean>

    <!--spring中基于注解的声明式事务控制配置步骤
        1.配置事务管理器
        2.开启spring对注解事务的支持
        3.在需要事务支持的地方使用@Transactional注解-->
    <!--配置事务管理-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--开启spring对注解事务的支持-->
    <tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>
</beans>

service实现类：

package com.itheima.service.impl;

import com.itheima.Dao.IAccountDao;
import com.itheima.domain.Account;
import com.itheima.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * @Author: lijiahao
 * @Description:
 * @Data: Create in 0:16 2020/2/6
 * @Modified By:
 */
@Service("accountService")
@Transactional(propagation = Propagation.SUPPORTS,readOnly = true)//只读型事务的配置
public class AccountServiceImpl implements IAccountService {

    @Autowired
    private IAccountDao accountDao;

    public Account findAccountById(Integer accountid) {
            return accountDao.findAccountById(accountid);
    }

    //需要的是读写型事务配置
    @Transactional(propagation = Propagation.REQUIRED,readOnly = false)
    public void transfer(String sourceName, String targetName, Float money) {
        System.out.println("trans......");
            //2.1.根据名称查询转出帐户
            Account source =  accountDao.findAccountByName(sourceName);
            //2.2.根据名称查询转入帐户
            Account target = accountDao.findAccountByName(targetName);
            //2.3.转出账户减钱
            source.setMoney(source.getMoney()-money);
            //2.4.转入帐户加钱
            target.setMoney(target.getMoney()+money);
            //2.5.更新转出账户
            accountDao.updateAccount(source);

            int i = 1/0;

            //2.6.更新转入账户
            accountDao.updateAccount(target);

    }
}

dao层实现类：

package com.itheima.Dao.impl;

import com.itheima.Dao.IAccountDao;
import com.itheima.domain.Account;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * @Author: lijiahao
 * @Description:
 * @Data: Create in 2:32 2020/2/9
 * @Modified By:
 */
@Repository("accountDao")
public class AccountDaoImpl implements IAccountDao {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    public Account findAccountById(Integer id) {
        List<Account> accountList = jdbcTemplate.query("select * from account where id = ?", new BeanPropertyRowMapper<Account>(Account.class),id);
        return accountList.isEmpty()?null:accountList.get(0);
    }

    public Account findAccountByName(String name) {
        List<Account> accountList = jdbcTemplate.query("select * from account where name = ?", new BeanPropertyRowMapper<Account>(Account.class),name);
        if(accountList.isEmpty()){
            return null;
        }
        if(accountList.size()>1){
            throw new RuntimeException("结果集不唯一");
        }
        return accountList.get(0);
    }

    public void updateAccount(Account account) {
        jdbcTemplate.update("update account set name=? ,money=? where id = ?", account.getName(),account.getMoney(),account.getId());
    }
}

实体类：

package com.itheima.domain;

import java.io.Serializable;

/**
 * @Author: lijiahao
 * @Description: 账户的实体类
 * @Data: Create in 1:32 2020/2/9
 * @Modified By:
 */
public class Account implements Serializable {

    private Integer id;
    private String name;
    private Float money;

    @Override
    public String toString() {
        return "account{" +
                "id=" + id +
                ", name=‘" + name + ‘‘‘ +
                ", money=" + money +
                ‘}‘;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Float getMoney() {
        return money;
    }

    public void setMoney(Float money) {
        this.money = money;
    }
}

测试：

package com.itheima.test;

import com.itheima.domain.Account;
import com.itheima.service.IAccountService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.util.List;

/**
 * @Author: lijiahao
 * @Description: 使用junit测试配置
 * @Data: Create in 0:59 2020/2/6
 * @Modified By:
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations="classpath:bean.xml")
public class AccountServiceTest {
    @Autowired
    private  IAccountService as;

    @Test
    public void testTransfer(){
        as.transfer("aaa", "bbb", 100f);
    }

}