springboot如何集成MyBatisplus实现增删改查

1. 导入MyBatisplus依赖

在pom.xml文件中引入MyBatisplus依赖：

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.4.3.1</version>
</dependency>

2. 配置数据源

在application.properties文件中配置数据源：

spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=123456

3. 配置MyBatisplus

在Spring Boot启动类上添加注解@EnableTransactionManagement和@MapperScan，@MapperScan注解会自动扫描mapper接口并生成实现类，@EnableTransactionManagement注解开启事务支持：

@SpringBootApplication
@EnableTransactionManagement
@MapperScan("com.example.demo.mapper")
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

4. 创建实体类

创建实体类并添加注解@Table和@Id：

@Data
@Table(name = "user")
public class User {
    @Id
    private Long id;
    private String name;
    private Integer age;
}

5. 创建Mapper接口

创建Mapper接口并继承BaseMapper，BaseMapper提供了常见的增删改查方法：

public interface UserMapper extends BaseMapper<User> {
}

6. 测试增删改查

在Controller中注入UserMapper，调用增删改查方法：

@RestController
public class UserController {
    @Autowired
    private UserMapper userMapper;

    @GetMapping("/user/{id}")
    public User getById(@PathVariable Long id) {
        return userMapper.selectById(id);
    }

    @PostMapping("/user")
    public boolean save(@RequestBody User user) {
        return userMapper.insert(user) > 0;
    }

    @PutMapping("/user")
    public boolean updateById(@RequestBody User user) {
        return userMapper.updateById(user) > 0;
    }

    @DeleteMapping("/user/{id}")
    public boolean deleteById(@PathVariable Long id) {
        return userMapper.deleteById(id) > 0;
    }
}

以上就是Spring Boot集成MyBatisplus实现增删改查的步骤。