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数据持久层框架mybatis学习：使用mybatis+SpringBoot完成增删改查

发布时间 2023-12-18 11:18:42作者: hqq的进阶日记

目录

一、MyBatis的应用配置

  1. 依赖 pom.xml
    注意：版本号的依赖冲突问题
<?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>org.example</groupId>
    <artifactId>03_myBatis_demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.7.12</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jdbc</artifactId>
            <version>2.7.12</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.3.1</version>
        </dependency>
        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <version>8.0.33</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.28</version>
        </dependency>
    </dependencies>

</project>
  1. workbench数据准备

  • 创建数据库：course

  • 建表user；

CREATE TABLE `user` (
  `id` INT(10) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  `name` VARCHAR(20) NOT NULL,
  `age` VARCHAR(50) NOT NULL,
  `sex` VARCHAR(50) NOT NULL,
  `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
  • 插数据：
insert into `user` (`name`,`age`,`sex`) values
('Tom','20','男'),
('Jack','22','男'),
('Lily','24','女');
  • 查询：
  1. 创建包：com/course/model
  2. resource下创建文件：mapper/mysql.xml，配置内容如下：
<?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.course">
    <select id="getUserCount" resultType="Integer">
        select count(*) from user;
    </select>

    <insert id="addUser" parameterType="com.course.model.User">
        insert into user(id,name,age,sex)
        values(#{id},#{name},#{age},#{sex})
    </insert>

    <update id="updateUser" parameterType="com.course.model.User">
        update user set name=#{name},age=#{age}
        where id=#{id}
    </update>
    
    <delete id="deleteUser" parameterType="Integer">
        delete from user where id = #{id}
    </delete>
</mapper>
  1. resource下创建文件：mybatis-config.xml
<?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>
    <typeAliases>
        <package name="com.course.model"/>
    </typeAliases>
    <mappers>
        <mapper resource="mapper/mysql.xml"/>
    </mappers>
</configuration>
  1. 配置 resource文件夹下：application.yml
server:
  port: 8188

logging:
  path: logs
  file: mylog.log

spring:
  application:
    name: myTest
  datasource:
    driver: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/course
    username: root
    password: root

mybatis:
  type-aliases-package: com.course.model
  mapper-locations:
    - mapper/*

二、使用mybatis+SpringBoot完成增删改查

2.1 代码实现

  1. com.course.Application.java
package com.course;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }
}
  1. com.course.controller.Demo.java
package com.course.controller;

import com.course.model.User;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("v1")
public class Demo {
    // 获取一个执行sql的对象
    @Autowired
    private SqlSessionTemplate template;

    @RequestMapping(value = "/getUserCount",method = RequestMethod.GET)
    public int getUserCount(){
        return template.selectOne("getUserCount");
    }

    @RequestMapping(value = "/addUser",method = RequestMethod.POST)
    public int addUser(@RequestBody User user){
        return template.insert("addUser",user);
    }

    @RequestMapping(value = "/updateUser",method = RequestMethod.POST)
    public int updateUser(@RequestBody User user){
        return template.update("updateUser",user);
    }

    @RequestMapping(value = "/deleteUser",method = RequestMethod.GET)
    public int delUser(@RequestParam int id){
        return template.delete("deleteUser",id);
    }
}
  1. com.course.model.User.java
package com.course.model;
import lombok.Data;

@Data
public class User {
    private int id;
    private String name;
    private String sex;
    private String age;

}

2.2 增删改查接口调用

  1. /v1/getUserCount：查询数据接口

  2. /v1/addUser：添加数据接口
    使用jmeter测试：
    1）添加Thread Group
    2）添加HTTP Header Manager：Content-Type=application/json
    3）添加HTTP Request：

    4）添加查看结果树


    5）查询数据库结果

  3. /v1/updateUser：更新数据接口
    使用jmeter测试：
    1）添加Thread Group
    2）添加HTTP Header Manager：Content-Type=application/json
    3）添加HTTP Request：

    4）添加查看结果树


    5）查询数据库结果

  4. /v1/deleteUser：删除数据接口
    使用jmeter测试：
    1）添加Thread Group
    2）添加HTTP Header Manager：Content-Type=application/json
    3）添加HTTP Request：

    4）添加查看结果树


    5）查询数据库结果