springboot整合Mybatis框架

最新推荐文章于 2024-09-26 15:59:05 发布

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最新推荐文章于 2024-09-26 15:59:05 发布

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分类专栏： springboot 文章标签： spring boot java spring mysql

本文链接：https://blog.youkuaiyun.com/Xiaobai_Tang/article/details/120714031

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该博客介绍了如何在Spring Boot项目中整合MyBatis，包括添加相关依赖、创建UserMapper.xml文件、定义User实体类和Mapper接口，以及编写 UserController进行CRUD操作。详细步骤帮助读者快速上手Spring Boot和MyBatis的结合使用。

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项目结构图

首先使用maven导入这三个依赖jar包

<!--mybatis-spring-boot-->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.2.0</version>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

<!--
使用这三个注解需要导入
@Data
@NoArgsConstructor
@AllArgsConstructor
-->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
</dependency>

在resources文件目录下创建mybatis=>mapper=>UserMapper.xml文件，完成mapper映射

<?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.example.springboot05smybatis.mapper.UserMapper">
    <!--简单的增删改查-->
    <select id="queryUserList" resultType="User">
        select * from user
    </select>
    
    <select id="queryUserById" resultType="User">
        select * from user where id=#{id}
    </select>
    
    <insert id="addUser" parameterType="User">
        insert into user(id, name, pwd) values (#{id},#{name},#{pwd})
    </insert>

    <update id="updateUser" parameterType="User">
        update user set name=#{name},pwd=#{pwd} where id=#{id}
    </update>

    <delete id="deleteUser" parameterType="int">
        delete from user where id=#{id}
    </delete>
</mapper>

创建com.example.springboot05smybatis.pojo.User实体类，文件包名有点繁琐

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {

    private int id;

    private String name;

    private String pwd;

}

创建com.example.springboot05smybatis.mapper.UserMapper

//这个注解表示了这是一个 mybatis的mapper类:Dao
@Mapper	//添加了@Mapper注解之后这个接口在编译时会生成相应的实现类
@Repository //@repository则需要在Spring中配置扫描包地址，然后生成dao层的bean，之后被注入到ServiceImpl中
public interface UserMapper {

    List<User> queryUserList();

    User queryUserById(int id);

    int addUser(User user);

    int updateUser(User user);

    int deleteUser(int id);

}

创建com.example.springboot05smybatis.controller.UserController

@RestController
public class UserController {

    @Autowired  //自动装
    private UserMapper userMapper;

    @GetMapping("/queryUserList")
    public List<User> queryUserList(){
        List<User> userList=userMapper.queryUserList();
        for (User user : userList) {
            System.out.println(user);
        }
        return userList;
    }

    //添加一个用户
    @GetMapping("/addUser")
    public String addUser(){
        userMapper.addUser(new User(6,"阿毛","1234543"));
        return "ok";
    }

    //修改一个用户
    @GetMapping("/updateUser")
    public String updateUser(){
        userMapper.updateUser(new User(6,"阿毛","654321"));
        return "ok";
    }

    //根据id删除用户
    @GetMapping("/deleteUser")
    public String deleteUser(){
        userMapper.deleteUser(5);
        return "ok";
    }