1. 实现步骤

2.具体实现

2.1 准备数据库

使用IDEA的DataBase插件连接数据库。

2.2 创建模块，引入依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.sdnu</groupId><artifactId>spring6-016-sm</artifactId><version>1.0-SNAPSHOT</version><packaging>jar</packaging><!--○ spring-context○ spring-jdbc○ mysql驱动○ mybatis○ mybatis-spring：mybatis提供的与spring框架集成的依赖○ 德鲁伊连接池○ junit--><!--仓库--><repositories><!--spring里程碑版本的仓库--><repository><id>repository.spring.milestone</id><name>Spring Milestone Repository</name><url>https://repo.spring.io/milestone</url></repository></repositories><dependencies><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>6.0.0-M2</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>6.0.0-M2</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.37</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.10</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>2.0.7</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.2.13</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.13.2</version><scope>test</scope></dependency></dependencies><properties><maven.compiler.source>17</maven.compiler.source><maven.compiler.target>17</maven.compiler.target></properties></project>

2.3 创建包

2.4 创建Pojo类

package com.sdnu.bank.pojo;public class Account {private String actno;public 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;}@Overridepublic String toString() {return "Account{" +"actno='" + actno + '\\'' +", balance=" + balance +'}';}
}

2.5 编写mapper接口

package com.sdnu.bank.mapper;import com.sdnu.bank.pojo.Account;import java.util.List;public interface AccountMapper { //该接口的实现类不用写，mybatis通过动态代理机制生成int insert(Account account);int deleteByActno(String actno);int update(Account account);Account selectByActno(String actno);List<Account> selectAll();
}

2.6 编写Mapper配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.sdnu.bank.mapper.AccountMapper"><select id="insert">insert into t_act values (#{actno, #{balance})</select><delete id="delete">delete from t_act where actno = #{actno}</delete><update id="update">update t_act set balance = #{balance} where actno = #{actno}</update><select id="selectByActno" resultType="Account">select * from t_act where actno = {#actno}</select><select id="selectAll" resultType="Account">select * from t_act</select>
</mapper>

2.7 编写service接口和service接口实现类

package com.sdnu.bank;import com.sdnu.bank.pojo.Account;import java.util.List;public interface AccountService {/*** 开户* @param act* @return*/int save(Account act);/*** 销毁* @param actno* @return*/int deleteByActno(String actno);/*** 修改账户* @param actno* @return*/int modify(Account actno);/*** 查询账户* @param actno* @return*/Account getByActno(String actno);/*** 获取所有账户* @return*/List<Account> getAll();/*** 转账* @param fromActno* @param toActno* @param money*/void transfer(String fromActno, String toActno, double money);
}

package com.sdnu.bank.service.impl;import com.sdnu.bank.AccountService;
import com.sdnu.bank.mapper.AccountMapper;
import com.sdnu.bank.pojo.Account;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.util.List;@Service("accountService")
public class AccountServiceImpl implements AccountService {@Autowiredprivate AccountMapper accountMapper;@Overridepublic int save(Account act) {return accountMapper.insert(act);}@Overridepublic int deleteByActno(String actno) {return accountMapper.deleteByActno(actno);}@Overridepublic int modify(Account act) {return accountMapper.update(act);}@Overridepublic Account getByActno(String actno) {return accountMapper.selectByActno(actno);}@Overridepublic List<Account> getAll() {return accountMapper.selectAll();}@Overridepublic void transfer(String fromActno, String toActno, double money) {Account fromAct = accountMapper.selectByActno(fromActno);if (fromAct.getBalance() < money) {throw new RuntimeException("余额不足");}Account toAct = accountMapper.selectByActno(toActno);fromAct.setBalance(fromAct.getBalance() - money);toAct.setBalance(toAct.getBalance() + money);int count = accountMapper.update(fromAct);count += accountMapper.update(toAct);if (count != 2) {throw new RuntimeException("转账失败");}}
}

2.8 编写jdbc.properties配置文件

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/spring6
jdbc.username=root
jdbc.password=root

2.9 编写mybatis-config.xml配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//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>

2.10编写spring.xml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: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"><!--○ 组件扫描○ 引入外部的属性文件○ 数据源○ SqlSessionFactoryBean配置■ 注入mybatis核心配置文件路径■ 指定别名包■ 注入数据源○ Mapper扫描配置器■ 指定扫描的包○ 事务管理器DataSourceTransactionManager■ 注入数据源○ 启用事务注解■ 注入事务管理器--><!--组件扫描--><context:component-scan base-package="com.sdnu.bank"/><!--引用外部的属性配置文件--><context:property-placeholder location="jdbc.properties"/><!--数据源--><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="${jdbc.username}"/><property name="password" value="${jdbc.password}"/></bean><!--配置sqlSessionFactoryBean--><bean class="org.mybatis.spring.SqlSessionFactoryBean"><!--mybatis核心配置文件路径--><property name="configLocation" value="mybatis-config.xml"/><!--注入数据源--><property name="dataSource" ref="dataSource"/><!--起别名--><property name="typeAliasesPackage" value="com.sdnu.bank.pojo"/></bean><!--Mapper扫描配置器，主要扫描mapper接口，生成代理类--><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"><property name="basePackage" value="com.sdnu.bank.mapper"/></bean><!--事务管理器--><bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><property name="dataSource" ref="dataSource"/></bean><!--开启事务注解--><tx:annotation-driven transaction-manager="txManager"/>
</beans>

2.11 测试

package com.sdnu.spring6.test;import com.sdnu.bank.AccountService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class SMTest {@Testpublic void testSM(){ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring.xml");AccountService accountService = applicationContext.getBean("accountService", AccountService.class);try {accountService.transfer("act001", "act002", 10000.0);System.out.println("转账成功");} catch (Exception e) {e.printStackTrace();System.out.println("转账失败");}}}

3.Spring配置文件的import

引入其它配置文件

<import resource="common.xml"/>