基础页面:https://movie.douban.com/top250 代码: from time import sleep from requests import get from bs4 import BeautifulSoup import re import pymysql db = pymysql.connect(host='localhost', user='root', password='123456', db='douban', charset='utf8mb4', cur
场景描述 从全文检索或者缓存中获取ID,根据ID查询数据库获取基础信息,进行页面展示 SQL:select * from table where id in(id1,id2,id3...id40) 此种场景的常规方案是将id对应的基础信息在redis中缓存一份,mysql只是做为后端存储.我们做如下测试就是尝试mysql是否可应对这种查询场景.然而根本原因是DBA告诉我,现在MySQL性能已经极其厉害. 数据量说明 1.8亿条数据 使用Oneproxy分为200个数据表(200个表在同一台机器)
版权声明:声明:本文档能够转载,须署名原作者. 作者:无为 qq:490073687 周祥兴 zhou.xiangxing210@163.com https://blog.csdn.net/Rookie_CEO/article/details/32075225 昨天在存储过程中用了语句insert into a select from b.在应用中发现bigint字段插入到int字段的时候,数值被截断了.插入后已经不是所要的值. 由于存储过程中没实用到异常捕捉的处理.所以一開始并未发现错误.仅仅
1.phpmyadmin导出 ) AS `a` LEFT JOIN ( SELECT * FROM `newerp_jifen_order_log` WHERE `content` = '客户确认收货' GROUP BY `order_id` ) `b` ON ( `a`.`order_id` = `b`.`order_id` ) JOIN `newerp_member` AS `c` ON (`a`.`member_id` = `c`.`id`) WHERE `b`.`order_id` IS
摘自:https://www.quora.com/What-is-a-schema-in-a-MySQL-database What is schema? In MySQL, physically, a schema is synonymous with a database. You can substitute the keyword schema instead of database in MySQL SQL syntax, for example using create schema