SpringBoot集成MyBatis-Plus的完整教程

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.5.5</version>
</dependency>

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/test_db?useUnicode=true&characterEncoding=utf-8
    username: root
    password: 123456
    driver-class-name: com.mysql.cj.jdbc.Driver
​
mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl  # 打印SQL日志

@Data
@TableName("user")
public class User {
    @TableId(type = IdType.AUTO)
    private Long id;
    private String name;
    private Integer age;
    private String email;
}

@Mapper
public interface UserMapper extends BaseMapper<User> {
    // BaseMapper 已经提供了CRUD方法，不需要写SQL
}

@SpringBootTest
class UserMapperTests {
​
    @Autowired
    private UserMapper userMapper;
​
    @Test
    void testSelect() {
        List<User> users = userMapper.selectList(null);
        System.out.println(users);
    }
​
    @Test
    void testInsert() {
        User user = new User();
        user.setName("张三");
        user.setAge(20);
        user.setEmail("zhangsan@example.com");
        int rows = userMapper.insert(user);
        System.out.println("插入成功：" + rows);
    }
}

// 根据ID查询
User user = userMapper.selectById(1L);
​
// 条件查询
List<User> users = userMapper.selectList(
    new LambdaQueryWrapper<User>()
        .eq(User::getAge, 20)
        .like(User::getName, "张")
);
​
// 分页查询（需要配置分页插件）
Page<User> page = userMapper.selectPage(
    new Page<>(1, 10), null
);
​
// 更新
userMapper.updateById(user);
​
// 删除
userMapper.deleteById(1L);

@Configuration
public class MyBatisPlusConfig {
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor());
        return interceptor;
    }
}