实现步骤
一，引入依赖
<repositories>
<repository>
<id>repository.spring.milestoneid>
<name>Spring Milestone Repositoryname>
<url>https://repo.spring.io/milestoneurl>
repository>
repositories>
<dependencies>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-contextartifactId>
<version>6.0.0-M2version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-jdbcartifactId>
<version>6.0.0-M2version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>5.1.8version>
dependency>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatisartifactId>
<version>3.5.11version>
dependency>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatis-springartifactId>
<version>2.0.7version>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>druidartifactId>
<version>1.2.13version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-testartifactId>
<version>6.0.0-M2version>
dependency>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>4.13.2version>
<scope>testscope>
dependency>
<dependency>
<groupId>jakarta.annotationgroupId>
<artifactId>jakarta.annotation-apiartifactId>
<version>2.1.1version>
dependency>
dependencies>
二，基于三层架构，准备所有的包和类
bean层（Account类）
package com.hkd.spring6.bean;
public class Account {
private String actno;
private Double balance;
public Account() {
}
public Account(String actno, Double balance) {
this.actno = actno;
this.balance = balance;
}
public String getActno() {
return actno;
}
public void setActno(String actno) {
this.actno = actno;
}
public Double getBalance() {
return balance;
}
public void setBalance(Double balance) {
this.balance = balance;
}
@Override
public String toString() {
return "Account{" +
"actno='" + actno + '\'' +
", balance=" + balance +
'}';
}
}
service层
接口
package com.hkd.spring6.service;
public interface ActService {
void transfer(String fromAct, String toAct, double money);
}
实现类
package com.hkd.spring6.service.impl;
import com.hkd.spring6.bean.Account;
import com.hkd.spring6.mapper.ActMapper;
import com.hkd.spring6.service.ActService;
import jakarta.annotation.Resource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
@Service("actService")
@Transactional
public class ActServiceImpl implements ActService {
@Resource(name = "actMapper")
private ActMapper actMapper;
@Override
public void transfer(String fromAct, String toAct, double money) {
Account select1 = actMapper.select(fromAct);
if (select1.getBalance() < money) {
throw new RuntimeException("余额不足");
}
Account select2 = actMapper.select(toAct);
select1.setBalance(select1.getBalance() -money);
select2.setBalance(select2.getBalance() + money);
int update = actMapper.update(select1);
update += actMapper.update(select2);
if (update != 2) {
throw new RuntimeException("转账失败");
}
}
}
mapper层
接口
package com.hkd.spring6.mapper;
import com.hkd.spring6.bean.Account;
public interface ActMapper {
Account select(String actno);
int update(Account account);
}
sql映射文件
DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.hkd.spring6.mapper.ActMapper">
<select id="select" resultType="Account">
select * from t_bank where actno = #{actno}
select>
<update id="update">
update t_bank set balance = #{balance} where actno = #{actno}
update>
mapper>
三，配置文件的完成
1.jdbc.properties（数据库相关配置文件）
jdbc.driver = com.mysql.jdbc.Driver
jdbc.url = jdbc:mysql://localhost:3306/mybatis
jdbc.user = root
jdbc.password = hsp
2.MyBatis核心配置文件
DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
settings>
configuration>
3.Spring配置文件
<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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<context:component-scan base-package="com.hkd.spring6"/>
<context:property-placeholder location="jdbc.properties"/>
<bean id="datasource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.user}"/>
<property name="password" value="${jdbc.password}"/>
bean>
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="datasource"/>
bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="datasource"/>
bean>
<bean class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="datasource"/>
<property name="typeAliasesPackage" value="com.hkd.spring6.bean"/>
<property name="configLocation" value="mybatis-config.xml"/>
bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.hkd.spring6.mapper"/>
bean>
beans>
四，测试代码
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:spring.xml")
public class TestSm {
@Autowired
private ActService actService;
@Test
public void testSm(){
try {
actService.transfer("act-001","act-002",1);
System.out.println("转账成功");
} catch (Exception e){
System.out.println("转账失败");
e.printStackTrace();
}
}
}
