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摘要: 原创|InnoDB事务锁系统及其实现 https://mp.weixin.qq.com/s/W07ZIW0GRtsrS5nuiy2z_A CATS事务调度算法 CATS(Contention Aware Transaction Schedule)是MySQL 8.0的一个新特性,相关论文发表在VLD 阅读全文
posted @ 2018-05-26 01:16 papering 阅读(319) 评论(0) 推荐(0)
摘要: 换座位 - LeetCode (中国) https://leetcode-cn.com/problems/exchange-seats/description/ Mary is a teacher in a middle school and she has a table seat storing 阅读全文
posted @ 2018-05-26 00:52 papering 阅读(341) 评论(0) 推荐(0)
摘要: 第N高的薪水 - LeetCode (中国) https://leetcode-cn.com/problems/nth-highest-salary/description/ Write a SQL query to get the nth highest salary from the Emplo 阅读全文
posted @ 2018-05-25 21:07 papering 阅读(231) 评论(0) 推荐(0)
摘要: select case when if 的一些用法 - 马丁传奇 - 博客园 https://www.cnblogs.com/martinzhang/p/3220595.html Write a SQL query to get the second highest salary from the  阅读全文
posted @ 2018-05-25 19:47 papering 阅读(254) 评论(0) 推荐(0)
摘要: https://leetcode-cn.com/problems/employees-earning-more-than-their-managers/description/ The Employee table holds all employees including their manage 阅读全文
posted @ 2018-05-25 02:17 papering 阅读(242) 评论(0) 推荐(0)
摘要: https://leetcode-cn.com/problems/swap-salary/description/ Given a table salary, such as the one below, that has m=male and f=female values. Swap all f 阅读全文
posted @ 2018-05-25 02:11 papering 阅读(255) 评论(0) 推荐(0)
摘要: SELECT * FROM cinema WHERE description NOT IN ("boring") AND id MOD 2 = 1 ORDER BY rating DESC 阅读全文
posted @ 2018-05-25 01:59 papering 阅读(206) 评论(0) 推荐(0)
摘要: 无重复字符的最长子串 - LeetCode (中国) https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/description/ 阅读全文
posted @ 2018-05-25 00:29 papering 阅读(177) 评论(0) 推荐(0)
摘要: 最长公共前缀 - LeetCode (中国) https://leetcode-cn.com/problems/longest-common-prefix/description/ 阅读全文
posted @ 2018-05-24 21:19 papering 阅读(243) 评论(0) 推荐(0)
摘要: https://docs.python.org/3/library/configparser.html 阅读全文
posted @ 2018-05-24 12:02 papering 阅读(115) 评论(0) 推荐(0)
摘要: import sys, os this_file_abspath = os.path.dirname(os.path.abspath(__file__)) ProjectUtil_path = '{}{}{}'.format(this_file_abspath, os.sep, 'ProjectUtil') sys.path.append(ProjectUtil_path) from... 阅读全文
posted @ 2018-05-24 11:34 papering 阅读(343) 评论(0) 推荐(0)
摘要: https://www.seleniumhq.org/download/ 阅读全文
posted @ 2018-05-24 10:35 papering 阅读(177) 评论(0) 推荐(0)
摘要: https://github.com/andymccurdy/redis-py/blob/master/redis/client.py https://github.com/PyMySQL/PyMySQL/blob/master/pymysql/__init__.py 阅读全文
posted @ 2018-05-23 22:30 papering 阅读(198) 评论(0) 推荐(0)
摘要: id_=document.getElementById("sidebar_categories");a_=id_.getElementsByTagName("a");len_=a_.length; sum_=0;for(i=0;i<len_;i++){n=a_[0].childNodes[0].no 阅读全文
posted @ 2018-05-23 21:43 papering 阅读(165) 评论(0) 推荐(0)
摘要: 当某个RDD的部分数据丢失时候,Saprk会根据记录的世系关系找到该RDD的父RDD以及更上级的RDD。只需要将该RDD依赖的上级RDD重新计算就可以将该RDD进行恢复。 Directed Acyclic Graph DAG RDD 的有向无环图构建过程,就是不停将Spark代码中刚一系列的RDD转 阅读全文
posted @ 2018-05-23 20:03 papering 阅读(379) 评论(0) 推荐(0)
摘要: https://github.com/PyMySQL/PyMySQL/blob/master/pymysql/__init__.py 建立连接 https://github.com/PyMySQL/PyMySQL/blob/master/pymysql/connections.py https:// 阅读全文
posted @ 2018-05-23 17:25 papering 阅读(629) 评论(0) 推荐(0)
摘要: a 翻译 搜索 复制 阅读全文
posted @ 2018-05-23 14:15 papering 阅读(180) 评论(0) 推荐(0)
摘要: 1-生成数据元结构,末端值全为0 2-拿到每行数据,去更新末端值 阅读全文
posted @ 2018-05-23 09:54 papering 阅读(147) 评论(0) 推荐(0)
摘要: redis.exceptions.ConnectionError: Error 99 connecting to 127.0.0.1:6379. Cannot assign requested address · Issue #219 · django/channels · GitHub https 阅读全文
posted @ 2018-05-23 08:09 papering 阅读(205) 评论(0) 推荐(0)
摘要: pid_ = rds.connection_pool.pidimport subprocess#handle = subprocess.Popen("", shell=False)subprocess.Popen("taskkill /F /T /PID {}".format(pid_), shell=True)print('go-----------') 阅读全文
posted @ 2018-05-22 22:21 papering 阅读(168) 评论(0) 推荐(0)
摘要: http://redis-py.readthedocs.io/en/latest/_modules/redis/client.html 解决办法: 阅读全文
posted @ 2018-05-22 21:33 papering 阅读(596) 评论(0) 推荐(0)
摘要: redis.connection — redis-py 2.10.5 documentation http://redis-py.readthedocs.io/en/latest/_modules/redis/connection.html#ConnectionPool 实例化后 应关闭所有连接,或 阅读全文
posted @ 2018-05-22 21:02 papering 阅读(659) 评论(0) 推荐(0)
摘要: 4200001526986984.6271074200001526986985.62778144200001526986986.62846764200001526986987.62905124200001526986988.62972264200001526986989.63043984200001 阅读全文
posted @ 2018-05-22 19:05 papering 阅读(291) 评论(0) 推荐(0)
摘要: ac_type = 'qq' if ac_type == 'qq': myid, mypwd = qq_key xp = '/html/body/div/div/div[2]/div/div/div/ul/li[3]' # udp xp = '/html/body/div/div/div[2]/div/d... 阅读全文
posted @ 2018-05-22 18:22 papering 阅读(412) 评论(0) 推荐(0)
摘要: 8 关注 41万 粉丝 u_following, u_followed = [i.get_attribute('number') for i in browser.find_element... 阅读全文
posted @ 2018-05-22 18:16 papering 阅读(239) 评论(0) 推荐(0)
摘要: From / Size | Elasticsearch Reference [6.2] | Elastic http://www.elastic.co/guide/en/elasticsearch/reference/current/search-request-from-size.html Fro 阅读全文
posted @ 2018-05-22 15:50 papering 阅读(146) 评论(0) 推荐(0)
摘要: db.collection.mapReduce() — MongoDB Manual 3.6 https://docs.mongodb.com/manual/reference/method/db.collection.mapReduce/ 阅读全文
posted @ 2018-05-22 12:41 papering 阅读(151) 评论(0) 推荐(0)
摘要: d = {'a': [1, 2], 'b': [1]}# --->d={'b':[1],'a':[1,2]} feature_d_ = {} for feature in feature_complete_l: feature_d_[feature] = feature_d[feature] del feature_d feature_d ... 阅读全文
posted @ 2018-05-22 01:13 papering 阅读(144) 评论(0) 推荐(0)
摘要: 11.10. shutil — High-level file operations — Python 3.6.5 documentation https://docs.python.org/3/library/shutil.html 阅读全文
posted @ 2018-05-22 00:20 papering 阅读(151) 评论(0) 推荐(0)
摘要: lokkit: The Lokkit utility attempts to provide firewalling for the average Linux end user. Instead of configuring firewall rules, Lokkit asks asmall n 阅读全文
posted @ 2018-05-21 21:12 papering 阅读(319) 评论(0) 推荐(0)
摘要: Ids Query | Elasticsearch Reference [6.2] | Elastic http://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-ids-query.html#query-dsl- 阅读全文
posted @ 2018-05-21 19:00 papering 阅读(395) 评论(0) 推荐(0)
摘要: https://mp.weixin.qq.com/s/ZqlhPC06_KW6a9OSgEuIVw 上面的线程栈我们注意到 nid 的值其实就是线程 ID,它是十六进制的,我们将消耗 CPU 最高的线程18250,转成十六进制0X47A,然后从上面的线程栈里找到nid=0X47A的线程,其栈为: " 阅读全文
posted @ 2018-05-21 01:42 papering 阅读(312) 评论(0) 推荐(0)
摘要: r 阅读全文
posted @ 2018-05-21 01:02 papering 阅读(177) 评论(0) 推荐(0)
摘要: 曲线拟合 阅读全文
posted @ 2018-05-20 23:08 papering 阅读(161) 评论(0) 推荐(0)
摘要: spark join 广告特征做广播 阅读全文
posted @ 2018-05-20 22:26 papering 阅读(213) 评论(0) 推荐(0)
摘要: 从内存的最小化占用角度解释 变,必然伴随着加法 阅读全文
posted @ 2018-05-20 22:13 papering 阅读(219) 评论(0) 推荐(0)
摘要: a 搜索 复制 阅读全文
posted @ 2018-05-20 19:34 papering 阅读(464) 评论(0) 推荐(0)
摘要: a 搜索 复制 阅读全文
posted @ 2018-05-20 18:35 papering 阅读(507) 评论(0) 推荐(0)
摘要: scala wordcount kmeans k-means算法的输入对象是d维向量空间的一些点,对一个d维向量的点集进行聚类。 k-means聚类算法会将集合D划分成k个聚簇。 阅读全文
posted @ 2018-05-20 17:56 papering 阅读(185) 评论(0) 推荐(0)
摘要: Scala In Depth 深入理解Scala 1、判等 2、并发 3、用None不用nul l 阅读全文
posted @ 2018-05-20 17:45 papering 阅读(162) 评论(0) 推荐(0)
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