Springboot整合mybatis

Springboot整合mybatis

1、导入依赖包

<dependency>
     <groupId>org.projectlombok</groupId>
     <artifactId>lombok</artifactId>
</dependency>

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

2、在配置文件中配置数据源

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

3、测试数据源能否成功

@SpringBootTest
class Spring01MybatisApplicationTests {

    @Autowired
    DataSource dataSource;

    @Test
    void contextLoads() throws SQLException {
        System.out.println(dataSource.getClass());
        System.out.println(dataSource.getConnection());
    }
}

class com.zaxxer.hikari.HikariDataSource
HikariProxyConnection@438660480 wrapping com.mysql.cj.jdbc.ConnectionImpl@3069a360

4、连接数据库，创建实体类

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private int id;
    private String name;
    private String pwd;
}

5、创建Mapper接口类

//这个注解表示了这是一个mybatis的mapper   类：Dao
@Mapper
@Repository
public interface UserMapper {
    User QueryUserByID(int id);
    int addUser(User user);
    int updateUser(User user);
    List<User> QueryUser();;
    int deleteUser(int id);
}

6、在reasources下创建mybatis.mapper.UserMapper.xml

<?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.wang.mapper.UserMapper">
    <select id="QueryUser" parameterType="ArrayList" resultType="User">
        select * from mybatis.user
    </select>

    <select id="QueryUserByID" resultType="User">
        select * from mybatis.user
    </select>

    <insert id="addUser" parameterType="User">
        insert into mybatis.user(id,name,pwd) values (#{id},#{name},#{pwd})
    </insert>

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

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

7、在配置文件中整合mybatis

#整合mybatis
mybatis.type-aliases-package=com.wang.pojo
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml

8、创建Controller控制层

@RestController
public class userController {

    @Autowired
    private UserMapper userMapper;

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