关于云计算:MyBatis初级实战之二增删改查

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https://github.com/zq2599/blog_demos

内容：所有原创文章分类汇总及配套源码，波及 Java、Docker、Kubernetes、DevOPS 等；

本文是《MyBatis 高级实战》系列的第二篇，通过前文咱们晓得了如何在 SpringBoot 中集成 MyBatis，本篇就一起来练习基本功：增删改查；

本篇概览

本篇要练习的内容如下：

1. 单表的增删改查
2. 批量新增
3. 联表查问

全文由以下局部组成：

1. 新建工程
2. 减少启动类
3. 减少 swagger 的配置类，工程蕴含了 swagger，以便稍后在浏览器上验证
4. 减少配置文件
5. 减少实体类
6. 减少 mapper 配置文件
7. 减少 mapper 接口
8. 减少 service，调用 mapper 接口
9. 减少 controller，调用 service 服务
10. 编写单元测试用例
11. 验证

源码下载

1. 如果您不想编码，能够在 GitHub 下载所有源码，地址和链接信息如下表所示 (https://github.com/zq2599/blo…：

1. 这个 git 我的项目中有多个文件夹，本章的利用在 <font color=”blue”>mybatis</font> 文件夹下，如下图红框所示：

开发

1. 本文的实战应用的数据库和表构造与前文《MyBatis 高级实战之一：Spring Boot 集成》截然不同；
2. 前文《MyBatis 高级实战之一：Spring Boot 集成》新建了父工程 mybatis，本文持续在此工程中新增子工程，名为 <font color=”blue”>curd</font>，整个子工程文件构造如下：

1. 批改父工程 mybatis 的 <font color=”blue”>pom.xml</font>，在 <font color=”blue”>dependencyManagement</font> 节点下新增两个 dependency 节点，如下所示，这么做是为了对立治理依赖库的版本：

<!-- swagger-ui -->
<dependency>
  <groupId>io.springfox</groupId>
  <artifactId>springfox-swagger-ui</artifactId>
  <version>2.5.0</version>
</dependency>

<dependency>
  <groupId>com.google.code.gson</groupId>
   <artifactId>gson</artifactId>
  <version>2.8.6</version>
</dependency>

1. 名为 <font color=”blue”>curd</font> 子工程，其 pom.xml 内容如下：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.bolingcavalry</groupId>
        <artifactId>mybatis</artifactId>
        <version>1.0-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>

    <groupId>com.bolingcavalry</groupId>
    <artifactId>curd</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>curd</name>
    <description>Demo project for Mybatis CURD in Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
        </dependency>
        <!-- swagger-ui -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

1. 减少启动类，留神要用 MapperScan 正文来指定 mapper 接口代码的包门路：

package com.bolingcavalry.curd;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.bolingcavalry.curd.mapper")
public class CurdApplication {public static void main(String[] args) {SpringApplication.run(CurdApplication.class, args);
    }
}

1. 本次实战用到了 swagger，这样能够很不便的通过浏览器向各个 controller 接口发送申请，以下是配置类：

package com.bolingcavalry.curd;

import springfox.documentation.service.Contact;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Tag;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@Configuration
@EnableSwagger2
public class SwaggerConfig {

    @Bean
    public Docket createRestApi() {return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .tags(new Tag("UserController", "用户服务"), new Tag("LogController", "日志服务"))
                .select()
                // 以后包门路
                .apis(RequestHandlerSelectors.basePackage("com.bolingcavalry.curd.controller"))
                .paths(PathSelectors.any())
                .build();}

    // 构建 api 文档的详细信息函数, 留神这里的注解援用的是哪个
    private ApiInfo apiInfo() {return new ApiInfoBuilder()
                // 页面题目
                .title("MyBatis CURD 操作")
                // 创建人
                .contact(new Contact("程序员欣宸", "https://github.com/zq2599/blog_demos", "zq2599@gmail.com"))
                // 版本号
                .version("1.0")
                // 形容
                .description("API 形容")
                .build();}
}

1. application.yml 内容如下：

server:
  port: 8080

spring:
  # 数据源
  datasource:
    username: root
    password: 123456
    url: jdbc:mysql://192.168.50.43:3306/mybatis?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
    driver-class-name: com.mysql.cj.jdbc.Driver

# mybatis 配置
mybatis:
  # 配置文件所在位置
  config-location: classpath:mybatis-config.xml
  # 映射文件所在位置
  mapper-locations: classpath:mappers/*Mapper.xml

# 日志配置
logging:
  level:
    root: INFO
    com:
      bolingcavalry:
        curd:
          mapper: debug

1. 减少 user 表的实体类 User.java，外面带有 swagger 的注解，不便在 swagger 页面展现：

package com.bolingcavalry.curd.entity;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;

@ApiModel(description = "用户实体类")
public class User {@ApiModelProperty(value = "用户 ID")
    private Integer id;

    @ApiModelProperty(value = "用户名", required = true)
    private String name;

    @ApiModelProperty(value = "用户地址", required = false)
    private Integer age;

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
    
    // 省去 get 和 set 办法，请您自行补齐
}

1. 减少 log 表的实体类 Log.java，外面带有 swagger 的注解，不便在 swagger 页面展现：

package com.bolingcavalry.curd.entity;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;

import java.sql.Date;

/**
 * @Description: 实体类
 * @author: willzhao E-mail: zq2599@gmail.com
 * @date: 2020/8/4 8:24
 */
@ApiModel(description = "日志实体类")
public class Log {@ApiModelProperty(value = "日志 ID")
    private Integer id;

    @ApiModelProperty(value = "用户 ID")
    private Integer userId;

    @ApiModelProperty(value = "日志内容")
    private String action;

    @ApiModelProperty(value = "创立工夫")
    private Date createTime;

    @Override
    public String toString() {
        return "Log{" +
                "id=" + id +
                ", userId=" + userId +
                ", action='" + action + '\'' +
                ", createTime=" + createTime +
                '}';
    }
    // 省去 get 和 set 办法，请您自行补齐
}

1. 为联表查问的后果筹备一个 bean，名为 LogExtend.java，继承自 Log.java，本人只有个 userName 字段，对应联表查问 user 表的 name 字段：

package com.bolingcavalry.curd.entity;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;

@ApiModel(description = "日志实体类 ( 含用户表的字段)")
public class LogExtend extends Log {public String getUserName() {return userName;}

    public void setUserName(String userName) {this.userName = userName;}

    @ApiModelProperty(value = "用户名")
    private String userName;

    @Override
    public String toString() {
        return "LogExtend{" +
                "id=" + getId() +
                ", userId=" + getUserId() +
                ", userName='" + getUserName() + '\'' +
                ", action='" + getAction() + '\'' +
                ", createTime=" + getCreateTime() +
                '}';
    }
}

1. 减少 user 表的 mapper 映射文件，可见都是些很简略 sql，要留神的是批量新增的节点，这外面用到了 <font color=”blue”>foreach</font> 语法，能够通过汇合动静生成 sql：

<?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.bolingcavalry.curd.mapper.UserMapper">

    <select id="sel" parameterType="int" resultType="user">
        select * from user where id = #{id}
    </select>

    <!-- 新增单条记录 -->
    <insert id="insertWithFields" useGeneratedKeys="true" keyProperty="id">
        insert into user (id, name, age) values (#{id}, #{name}, #{age})
    </insert>

    <!-- 批量新增 -->
    <insert id="insertBatch" useGeneratedKeys="true" keyProperty="id">
        insert into user (id, name, age)
        values
        <foreach collection="users" item="user" separator=",">
            (#{user.id}, #{user.name}, #{user.age})
        </foreach>
    </insert>

    <!-- 依照名称查找 -->
    <select id="findByName" parameterType="String" resultType="user">
        select id, name, age from user where name like concat('%', #{name}, '%')
    </select>

    <!-- 删除指定数据 -->
    <delete id="delete">
        delete from user where id= #{id}
    </delete>

    <!-- 删除所有数据 -->
    <delete id="clearAll">
        delete from user
    </delete>

    <!-- 更新 -->
    <update id="update">
        update user set name = #{name}, age = #{age} where id = #{id}
    </update>

    <!-- 获取总数 -->
    <select id="totalCount" resultType="java.lang.Integer">
        select count(*) from user
    </select>
</mapper>

1. 减少 log 表的 mapper 映射文件，如下所示，请关注联表操作 <font color=”blue”>selExtend</font>，其后果是 logExtendResultMap：

<?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.bolingcavalry.curd.mapper.LogMapper">

    <resultMap id="logExtendResultMap" type="logExtend">
        <id property="id" column="id"/>
        <result column="user_id" jdbcType="INTEGER" property="userId"/>
        <result column="action" jdbcType="VARCHAR" property="action"/>
        <result column="create_time" jdbcType="TIMESTAMP" property="createTime"/>
        <result column="user_name" jdbcType="TIMESTAMP" property="userName"/>
    </resultMap>

    <!-- 新增单条记录 -->
    <insert id="insertWithFields" useGeneratedKeys="true" keyProperty="id" parameterType="log">
        insert into log (id, user_id, action, create_time) values (#{id}, #{userId}, #{action}, #{createTime})
    </insert>

    <select id="selExtend" parameterType="int" resultMap="logExtendResultMap">
        select l.id as id,
               l.user_id as user_id,
               l.action as action,
               l.create_time as create_time,
               u.name as user_name
        from log as l
        left join user as u
        on l.user_id = u.id
        where l.id = #{id}
    </select>

</mapper>

1. 减少用户表的 mapper 接口类 <font color=”blue”>UserMapper.java</font>，对应着映射文件中的 sql 节点的 id：

package com.bolingcavalry.curd.mapper;

import com.bolingcavalry.curd.entity.LogExtend;
import com.bolingcavalry.curd.entity.User;
import org.springframework.stereotype.Repository;
import java.util.List;

@Repository
public interface UserMapper {User sel(int id);

    int insertWithFields(User user);

    int insertBatch(List<User> users);

    int clearAll();

    List<User> findByName(String name);

    int update(User user);

    int delete(int id);

    int totalCount();

    LogExtend selExtend(int id);
}

1. 减少日志表的 mapper 接口类 <font color=”blue”>LogMapper.java</font>，对应着映射文件中的 sql 节点的 id：

package com.bolingcavalry.curd.mapper;

import com.bolingcavalry.curd.entity.Log;
import com.bolingcavalry.curd.entity.LogExtend;
import org.springframework.stereotype.Repository;

@Repository
public interface LogMapper {Log sel(int id);

    LogExtend selExtend(int id);

    int insertWithFields(Log log);
}

1. mapper 接口实现后就是 service 层，先写 user 表的 service，如下所示，可见都是对 mapper 接口的调用：

package com.bolingcavalry.curd.service;

import com.bolingcavalry.curd.entity.User;
import com.bolingcavalry.curd.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;

@Service
public class UserService {

    @Autowired
    UserMapper userMapper;

    public User sel(int id) {return userMapper.sel(id);
    }

    public User insertWithFields(User user) {userMapper.insertWithFields(user);
        return user;
    }

    public List<User> insertBatch(List<User> users) {userMapper.insertBatch(users);
        return users;
    }

    public int clearAll() {return userMapper.clearAll();
    }

    public List<User> findByName(String name) {return userMapper.findByName(name);
    }

    public int update(User user) {return userMapper.update(user);
    }

    public int delete(int id) {return userMapper.delete(id);
    }

    public int totalCount() {return userMapper.totalCount();
    }
}

1. 还有 log 表的 service：

package com.bolingcavalry.curd.service;

import com.bolingcavalry.curd.entity.Log;
import com.bolingcavalry.curd.entity.LogExtend;
import com.bolingcavalry.curd.entity.User;
import com.bolingcavalry.curd.mapper.LogMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class LogService {
    @Autowired
    LogMapper logMapper;

    public Log sel(int id){return logMapper.sel(id);
    }

    public LogExtend selExtend(int id) {return logMapper.selExtend(id);
    }

    public Log insertWithFields(Log log) {logMapper.insertWithFields(log);
        return log;
    }

}

1. 最初是 controller 层了，因为应用了 swagger，导致 controller 绝对上一篇稍微简单（多了些注解）：

package com.bolingcavalry.curd.controller;

import com.bolingcavalry.curd.entity.User;
import com.bolingcavalry.curd.service.UserService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.ArrayList;
import java.util.List;

@RestController
@RequestMapping("/user")
@Api(tags = {"UserController"})
public class UserController {

    @Autowired
    private UserService userService;


    @ApiOperation(value = "新增 user 记录", notes="新增 user 记录")
    @RequestMapping(value = "/insertwithfields",method = RequestMethod.PUT)
    public User create(@RequestBody User user) {return userService.insertWithFields(user);
    }

    @ApiOperation(value = "批量新增 user 记录", notes="批量新增 user 记录")
    @RequestMapping(value = "/insertbatch", method = RequestMethod.PUT)
    public List<User> insertBatch(@RequestBody List<User> users) {return userService.insertBatch(users);
    }

    @ApiOperation(value = "删除指定 ID 的 user 记录", notes="删除指定 ID 的 user 记录")
    @ApiImplicitParam(name = "id", value = "用户 ID", paramType = "path", required = true, dataType = "Integer")
    @RequestMapping(value = "/{id}", method = RequestMethod.DELETE)
    public int delete(@PathVariable int id){return userService.delete(id);
    }

    @ApiOperation(value = "删除 user 表所有数据", notes="删除 user 表所有数据")
    @RequestMapping(value = "/clearall", method = RequestMethod.DELETE)
    public int clearAll(){return userService.clearAll();
    }

    @ApiOperation(value = "依据 ID 批改 user 记录", notes="依据 ID 批改 user 记录")
    @RequestMapping(value = "/update", method = RequestMethod.POST)
    public int update(@RequestBody User user){return userService.update(user);
    }

    @ApiOperation(value = "依据名称含糊查找所有 user 记录", notes="依据名称含糊查找所有 user 记录")
    @ApiImplicitParam(name = "name", value = "用户名", paramType = "path", required = true, dataType = "String")
    @RequestMapping(value = "/findbyname/{name}", method = RequestMethod.GET)
    public List<User> findByName(@PathVariable("name") String name){return userService.findByName(name);
    }

    @ApiOperation(value = "依据 ID 查找 user 记录", notes="依据 ID 查找 user 记录")
    @ApiImplicitParam(name = "id", value = "用户 ID", paramType = "path", required = true, dataType = "Integer")
    @RequestMapping(value = "/{id}", method = RequestMethod.GET)
    public User GetUser(@PathVariable int id){return userService.sel(id);
    }

    @ApiOperation(value = "获取总数", notes="获取总数")
    @RequestMapping(value = "/totalcount", method = RequestMethod.GET)
    public int totalcount(){return userService.totalCount();
    }
}

1. log 的 controller 如下：

package com.bolingcavalry.curd.controller;

import com.bolingcavalry.curd.entity.Log;
import com.bolingcavalry.curd.entity.LogExtend;
import com.bolingcavalry.curd.service.LogService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/log")
@Api(tags = {"LogController"})
public class LogController {
    @Autowired
    private LogService logService;

    @ApiOperation(value = "依据 ID 查找日志记录", notes="依据 ID 查找日志记录")
    @ApiImplicitParam(name = "id", value = "日志 ID", paramType = "path", required = true, dataType = "Integer")
    @RequestMapping(value = "/{id}", method = RequestMethod.GET)
    public LogExtend logExtend(@PathVariable int id){return logService.selExtend(id);
    }

    @ApiOperation(value = "新增日志记录", notes="新增日志记录")
    @RequestMapping(value = "/insertwithfields",method = RequestMethod.PUT)
    public Log create(@RequestBody Log log) {return logService.insertWithFields(log);
    }
}

1. 最初是一段单元测试的代码，咱们试试通过 junit 进行自测，如下所示，可见一共测试了三个 controller 接口：先新增，再查找，最初删除，要留神的是 MockMvc 的用法，以及 jsonPath 办法的用法，还有就是通过 Order 注解管制执行程序（肯定要增加 TestMethodOrder 注解，否则 Order 注解不失效）：

package com.bolingcavalry.curd.controller;

import com.bolingcavalry.curd.entity.User;
import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonParser;
import org.junit.Ignore;
import org.junit.jupiter.api.*;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.http.MediaType;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;

import java.util.List;
import java.util.UUID;

import static org.hamcrest.Matchers.hasSize;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.core.IsEqual.equalTo;
import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;

@RunWith(SpringRunner.class)
@SpringBootTest
@AutoConfigureMockMvc
@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
class UserControllerTest {

    @Autowired
    private MockMvc mvc;

    // user 表的 name 字段，这里为了保障测试时新增和删除的记录是同一条，用 UUID 作为用户名
    static String testName;

    @BeforeAll
    static void init() {testName = UUID.randomUUID().toString().replaceAll("-","");;
    }

    @Test
    @Order(1)
    void insertWithFields() throws Exception {String jsonStr = "{\"name\": \"" + testName + "\", \"age\": 10}";

        mvc.perform(MockMvcRequestBuilders.put("/user/insertwithfields")
                        .contentType(MediaType.APPLICATION_JSON)
                        .content(jsonStr)
                        .accept(MediaType.APPLICATION_JSON))
                .andExpect(status().isOk())
                .andExpect(jsonPath("$.name", is(testName)))
                .andDo(print())
                .andReturn()
                .getResponse()
                .getContentAsString();}

    @Test
    @Order(2)
    void findByName() throws Exception {mvc.perform(MockMvcRequestBuilders.get("/user/findbyname/"+ testName).accept(MediaType.APPLICATION_JSON))
                .andExpect(status().isOk())
                .andExpect(jsonPath("$", hasSize(1)))
                .andDo(print());
    }


    @Test
    @Order(3)
    void delete() throws Exception {
        // 先依据名称查出记录
        String responseString = mvc.perform(MockMvcRequestBuilders.get("/user/findbyname/"+ testName).accept(MediaType.APPLICATION_JSON))
                .andExpect(status().isOk())
                .andExpect(jsonPath("$", hasSize(1)))
                .andDo(print())
                .andReturn()
                .getResponse()
                .getContentAsString();

        // 反序列化失去数组
        JsonArray jsonArray = JsonParser.parseString(responseString).getAsJsonArray();

        // 反序列化失去 user 实例
        User user = new Gson().fromJson(jsonArray.get(0), User.class);

        // 执行删除
        mvc.perform(MockMvcRequestBuilders.delete("/user/"+ user.getId()).accept(MediaType.APPLICATION_JSON))
                .andExpect(status().isOk())
                .andExpect(content().string(equalTo("1")))
                .andDo(print());
    }
}

• 至此编码完结，开始验证上述性能；

单元测试验证

1. IDEA 关上 <font color=”blue”>UserControllerTest.java</font>，点击下图红框中的图标即可开始执行单元测试：

1. 单元测试实现后 IDEA 会给出后果，如下图，红框右侧能够查看具体的测试过程数据：

• 篇幅所限，这只有大量的单元测试用例，接下来用 swagger 来验证每个接口；

swagger 验证 web 接口

1. 如下图，启动 CurdApplication 类：

1. 浏览器拜访：http://localhost:8080/swagger-ui.html，即可关上 swagger 页面，如下图：

1. 先试试新增的接口，操作如下图：

1. 点击了上图红框 3 的 Try it out! 按钮后，响应信息如下图，可见操作胜利：

1. 限于篇幅，其余接口的测试就不逐个列出了，请您自行验证；

• 至此，MyBatis 的根本增删改查和简略的联表操作的实战就实现了，接下来咱们会持续摸索 MyBatis 的基本操作；

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