MyBatis-Plus实现分页查询

概述

（1）MyBatis-Plus有分页扩展插件，配置即可使用
（2）依赖版本

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.3.2</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.3.2</version>
        </dependency>

注入插件

import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MyBatisPlusConfig {
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }
}

编写查询接口

    @GetMapping("/person/query")
    public Page<Person> queryPerson(@RequestParam("name") String name, @RequestParam("pageNum") Integer pageNum, @RequestParam("pageSize") Integer pageSize) {
        //pageNum当前第几页，pageSize每页多少条数据
        Page<Person> personPage = new Page<>(pageNum, pageSize);
        //条件构造器和查询接口都是逆向工程生成的
        QueryWrapper<Person> personQueryWrapper = new QueryWrapper<>();
        //根据姓名模糊查询
        personQueryWrapper.like("name", name);
        return iPersonService.page(personPage, personQueryWrapper);
    }

查看结果

访问http://localhost:8080/person/query?name=张三&pageNum=1&pageSize=5

{
    "records": [
        {
            "id": 2,
            "name": "张三",
            "age": 1,
            "createTime": "2021-07-29 16:22:52"
        },
        {
            "id": 3,
            "name": "张三",
            "age": 2,
            "createTime": "2021-07-29 16:22:52"
        },
        {
            "id": 4,
            "name": "张三",
            "age": 3,
            "createTime": "2021-07-29 16:22:52"
        }
    ],
    "total": 3,
    "size": 5,
    "current": 1,
    "orders": [],
    "optimizeCountSql": true,
    "hitCount": false,
    "searchCount": true,
    "pages": 1
}

扩展内容

可以配置MyBatis-Plus日志

mybatis-plus:
  mapper-locations: classpath:/mapper/*Mapper.xml
  typeAliasesPackage: com.baomidou.springboot.entity
  typeEnumsPackage: com.baomidou.springboot.entity.enums
  global-config:
    id-type: auto
    table-underline: true
  configuration:
    map-underscore-to-camel-case: true
    cache-enabled: false
    ## 这一行是MyBatis-Plus控制台日志
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl 

其实分页主要是在Sql后家里LIMIT