文章目录

1. 实现步骤
2.具体实现
- 2.1 准备数据库
- 2.2 创建模块，引入依赖
- 2.3 创建包
- 2.4 创建Pojo类
- 2.5 编写mapper接口
- 2.6 编写Mapper配置文件
- 2.7 编写service接口和service接口实现类
- 2.8 编写jdbc.properties配置文件
- 2.9 编写mybatis-config.xml配置文件
- 2.10编写spring.xml配置文件
- 2.11 测试
3.Spring配置文件的import

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。
在这里插入图片描述

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

在这里插入图片描述

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;
    }

    @Override
    public 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 mapper
        PUBLIC "-//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 {
    @Autowired
    private AccountMapper accountMapper;

    @Override
    public int save(Account act) {
        return accountMapper.insert(act);
    }

    @Override
    public int deleteByActno(String actno) {
        return accountMapper.deleteByActno(actno);
    }

    @Override
    public int modify(Account act) {
        return accountMapper.update(act);
    }

    @Override
    public Account getByActno(String actno) {
        return accountMapper.selectByActno(actno);
    }

    @Override
    public List<Account> getAll() {
        return accountMapper.selectAll();
    }

    @Override
    public 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 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>

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 {
    @Test
    public 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");
        }
    }

}