PageHelper和Mybatis-plus分页的使用

最新推荐文章于 2025-10-30 18:26:25 发布

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本文介绍如何在Spring Boot项目中使用PageHelper和Mybatis-plus实现分页功能。通过具体步骤指导读者完成环境搭建、依赖配置及代码编写，并提供测试方法。

PageHelper和Mybatis-plus分页的使用

一、PageHelper

① 准备sql

CREATE TABLE `t_user` (
  `id` int NOT NULL COMMENT '主键id',
  `name` varchar(255) DEFAULT NULL COMMENT '名字',
  `age` int DEFAULT NULL COMMENT '年龄',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

在这里插入图片描述 ② 创建springboot项目

③ 编写pom文件

<dependencies>
    <dependency>
        <groupId>com.github.pagehelper</groupId>
        <artifactId>pagehelper-spring-boot-starter</artifactId>
        <version>1.4.3</version>
    </dependency>

    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-boot-starter</artifactId>
        <version>3.5.0</version>
    </dependency>

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

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

    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

主要是导入 pagehelper-spring-boot-starter 依赖
④ 编写application.yml 文件

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/zhuicat?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
    username: root
    password: 123456
server:
  port: 8854

pagehelper:
  helper-dialect: mysql
  reasonable: true
  support-methods-arguments: true

# 日志配置
logging:
  level:
    com.example: debug
    org.springframework: warn

⑤ 创建entity实体类User

@Data
@AllArgsConstructor
@NoArgsConstructor
@TableName("t_user")
public class User  {
    //主键id
    @TableId
    private Integer id;
    //名字
    private String name;
    //年龄
    private Integer age;
}

创建 mapper文件 UserMapper

public interface UserMapper extends BaseMapper<User> {}

创建service文件 UserService

public interface UserService extends IService<User> {}

创建service实现类 UserServiceImpl

@Service("userService")
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {}

创建controller层 UserController

@RestController
@RequestMapping("/user")
public class UserController {

    @Resource
    private UserService userService;

    @GetMapping
    public List<User> list(Integer page,Integer rows) {
        PageHelper.startPage(page,rows);
        List<User> userList = userService.list();
        PageInfo<User> pageInfo = new PageInfo<>(userList);
        long total = pageInfo.getTotal();
        int pages = pageInfo.getPages();

        return userList;
    }
}

Soringboot主启动类 Application

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

⑥ 测试：
在这里插入图片描述

二、Mybatis-plus

我们在上面搭建的项目进行

① 之前的依赖已经导入了

主要就是:mybatis-plus-boot-starter

② application.yml

# mybatis-plus
mybatis-plus:
  mapper-locations: classpath:mapper/*.xml
  # 控制台打印sql语句
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

③ controller

@RestController
@RequestMapping("/user")
public class UserController {

    @Resource
    private UserService userService;
    
    @GetMapping("/list")
    public List<User> list2(Integer page,Integer rows) {
        Page<User> pageUser = new Page<>(page,rows);
        userService.page(pageUser,null);

        List<User> userList = pageUser.getRecords();
        long total = pageUser.getTotal();
        return userList;
    }

}