How springboot integrates mybatis paging interceptor

Introduction

When I was developing today, I wanted to optimize the code I wrote, because I didn’t want to do it on the development server, and I was afraid that it would cause a lot of problems in GIT when it comes to the production server, and then separate it. Turning to my wheel (tool) project, after the final run, I found that it was stuck for at least 10 seconds when getting the List. I was shocked. My normal version usually takes about 800ms (don’t look at it for a long time, because the amount of data is huge, and It's normal.), the premise is that I also know that it is very slow. When it really needs optimization, I will release my optimized plus version and go back to 10 seconds. When I first received this app project, when I used PageHelper .startPage(page, num); (paging), the page has been divided before the data encapsulation (PageInfo) is found. Now I have found this problem when I switch to the wheel. It does not help me splice limit into sql. Later, I got all of them and then PageInfo paging. The huge amount of data caused it to be very stuck. Finally...

10 seconds:

Normal:

springboot integrates mybatis paging interceptor

Paging interception is actually to get the sql and then splice the sql into limit

pom.xml

   <!-- 引入分页插件 -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.2.0</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.21</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
         <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </dependency>

yml

spring:
  application:
    name: spring-cloud-dynamic
  datasource:
    #类型
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/f2f?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
    username: root
    password: 

    initial-size: 2
    max-idle: 10
    min-idle: 1
    max-wait: 60000
    max-active: 20 #最大空闲连接数
    #多久进行一次检测，检测需要关闭的空闲连接
    time-between-eviction-tuns-millis: 60000

MybatisConfig

/**
 * @author lanys
 * @Description:
 * @date 23/7/2021 下午8:38
 */

@Configuration
@EnableTransactionManagement
@PropertySource(value = "classpath:application.yml", ignoreResourceNotFound = true)
public class MybatisConfig implements TransactionManagementConfigurer {

    @Value("${mybatis.mapper-locations}")
    private String mapper;

    @Value("${mybatis.type-aliases-package}")
    private String aliases;

    @Autowired
    private DataSource dataSource;

    @Bean(name = "sqlSessionFactory")
    public SqlSessionFactory sqlSessionFactory() throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        // 设置数据源
        bean.setDataSource(dataSource);
        // 设置xml
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapper));
        // 设置别名
        bean.setTypeAliasesPackage(aliases);
        // 添加分页插件
        bean.setPlugins(new Interceptor[]{pageInterceptor()});
        bean.getObject().getConfiguration().setMapUnderscoreToCamelCase(true);
        return bean.getObject();
    }

    /**
     * 分页拦截器
     * @return
     */
    private PageInterceptor pageInterceptor() {
        PageInterceptor pageInterceptor = new PageInterceptor();
        // 详见 com.github.pagehelper.page.PageParams
        Properties p = new Properties();
        // RowBounds是否进行count查询 - 默认不查询
        p.setProperty("rowBoundsWithCount", "true");
        // 当设置为true的时候，如果page size设置为0（或RowBounds的limit=0），就不执行分页，返回全部结果
        p.setProperty("pageSizeZero", "true");
        // 分页合理化
        p.setProperty("reasonable", "false");
        // 是否支持接口参数来传递分页参数，默认false
        p.setProperty("supportMethodsArguments", "true");
        // 设置数据库方言 ， 也可以不设置，会动态获取
        p.setProperty("helperDialect", "mysql");
        pageInterceptor.setProperties(p);
        return pageInterceptor;
    }

    @Override
    public PlatformTransactionManager annotationDrivenTransactionManager() {
        return new DataSourceTransactionManager(dataSource);
    }
}

Test

My own code

/**
     * 关注列表
     * @param userId
     * @param page
     * @param size
     * @return
     */
    @Override
    public List<DynamicInfo> focusList(Long userId, Integer page, Integer size) {
        PageHelper.startPage(page, size);

        List<DynamicInfo> listByUserId = new ArrayList<>();
        try {
            //获取自己关注列表
            listByUserId = this.dynamicReleaseMapper.getListFocusId(userId);
            if (listByUserId == null || listByUserId.size() == 0){
                return listByUserId;
            }
            //List<DynamicInfo> listByUserId = this.dynamicReleaseMapper.getListFocusId(userId).stream().filter(x->(x.getIsPicture()!=2 && x.getIsVideo() !=2)||(x.getIsPicture()==2 && x.getIsVideo() !=2)||(x.getIsPicture()!=2 && x.getIsVideo() ==2)).collect(Collectors.toList());
            publicGetDynamicInfo(userId,listByUserId);
            //}
            log.info("-------获取关注列表-------");
            return listByUserId;
        } catch (Exception e) {
            log.error("获取关注列表异常",e);
        }
        return listByUserId;
    }

If you want to paginate, add PageHelper.startPage(page, size);, Otherwise, paging will not be done by default. You can also add limit yourself.

Result (a part of the sql statement is very long):

GROUP BY id ORDER BY create_time desc LIMIT ?

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