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  • [Kotlin] Nullable Variables2020-10-11 02:01:25

    In Kotlin, it helps to avoid null reference, which means by default you cannot assign null value to any variable;   But if you do want to assign null to a variable, you can do: var strnull: String? = null     Safe guard: just like Typescript, you can u

  • mysql占用内存过多2020-10-01 23:00:23

    一、计算mysql所需的内存 https://www.cnblogs.com/cheyunhua/p/9045057.html  理论有待学习 https://www.cnblogs.com/simplelogic/archive/2012/12/06/2804798.html  mysql used mem = key_buffer_size + query_cache_size + tmp_table_size + innodb_buffer_pool_size + inn

  • C语言代码第二天2020-09-09 18:33:11

    数据类型      代码: #include <stdio.h> #include <string.h> #include <math.h> #include <stdlib.h> int main() {     int i = 4;     double d = 4.0;     char s[] = "HackerRank ";          // Declare second integer, do

  • mysql2020-09-04 10:32:23

    set GLOBAL max_connections=3000; set GLOBAL table_open_cache=3000; set GLOBAL mysqlx_max_connections=3000; set GLOBAL tmp_table_size=333554432; show variables like 'log_queries_not_using_indexes';show variables like '%max_connections%&

  • Java Tutorials(the traditional features of the Java, including variables, arrays, data types, operat2020-08-07 08:02:45

    Language Basics the traditional features of the Java, including variables, arrays, data types, operators and control flow Variables kinds of variables in Java Instance Variables(Non-Static Fields) Instance Variables are unique to each instance of a ob

  • 2020SAT竞赛综述解读2——文献学习Relaxed Backtracking with Rephasing_求解器Relaxed LCMDCBDL系列2020-08-06 21:35:12

    作者: Xindi Zhang1,2 and Shaowei Cai1,2* 1State Key Laboratory of Computer Science, Institute of Software, Chinese Academy of Sciences, Beijing, China2School of Computer Science and Technology, University of Chinese Academy of Sciences, Chinadezhangxd@163.

  • TensorFlow 笔记 ——1 —— GraphKeys,等待补充2020-07-28 15:01:56

    https://tensorflow.google.cn/versions/r1.15/api_docs/python/tf/GraphKeys?hl=zh_cn   Class GraphKeys 用于graph collections的标准名称 别名: Class tf.compat.v1.GraphKeys 标准库使用各种众所周知的名称来收集和检索与图关联的值。例如,如果指定为none,tf.Optimizer子类

  • 【MySQL】SQL文调优(B+Tree索引)2020-07-23 08:31:14

    原则(最左前缀): (1)Group By / Order By 中的字段,需要追加索引(index) (2)join 的 on 关键字后的联合条件,需要追加索引(index) (3)Where中的条件,需要追加索引(index) (4)Like条件中, 右模糊查询(’XXX%‘),可以使用索引;左模糊查询(‘%XXX’),不可以使用索引。 (5)straight_join 强制指定表关联,优于left join

  • FastReport几个问题2020-07-21 12:07:19

    1.FastReport中如何共用TFrxreport及TfrxDBDataSet 一个程序中,不管多么大的程序,只要打印或预览时是模式的,则完全可以共用一个TFrxreport 变量及几个TfrxDBDataSet。只不过,要注意完成一个报表程序的步骤,主要是下面几步1)清除报表,得到一个全新的报表内容。Frxreport1.clear。2)设置

  • mysql的存储引擎2020-07-08 23:06:25

    1.存储引擎的概念        2.查看存储引擎   查询所有的引擎:     show engines;     当前使用的引擎:      show variables like '%storage_engine%'   3.MYISAM与InnoDB的区别        

  • mysql错误详解(1819):ERROR 1819 (HY000): Your password does not satisfy the current policy requirements2020-06-25 19:55:19

    O(∩_∩)O哈哈~ 在学习 Mysql 的时候又遇到了新问题了 o(╥﹏╥)o 当我在准备为用户授权的时候: grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option; 遇到如下的情况o(╥﹏╥)o: ERROR 1819 (HY000): Your password does not satisfy the current

  • postman断言总结2020-06-17 19:02:49

    postman老式断言与新式断言总结:本文以微信开发者文档为例 断言处如图所示       一、老式断言      老式断言总结:var variables相当于代码中定义的变量,test['']=true;相当于python中print()函数的输出功能,可以打印出定义的变量值,json断言语法可以根据json数据结构径直取

  • mysql innodb 文件2020-05-27 19:55:28

    mysql --help | grep my.cnf 查看配置文件   参数文件 查看参数变量: 通过命令 show variables [like 'abc'\G]; 或者查看 information_schema下的global_variables视图 修改动态变量:分为会话范围和全局范围修改 set a=1     日志文件 show variables like 'log_error'\G; //错

  • 个人编程规范2020-03-15 20:53:35

    缩写 单词 缩写 出处 expression expr subPathExpr https://kubernetes.io/docs/concepts/storage/volumes/#using-subpath-with-expanded-environment-variables

  • 如何为网站添加 CSS 暗模式(转载)2020-03-13 11:56:24

    How To Add CSS Dark Mode To A Website 如何为网站添加 CSS 暗模式 原文地址:https://kevq.uk/how-to-add-css-dark-mode-to-a-website/ Posted on 发表于03/02/2020 03 / 02 / 2020 by 作者Kev Quirk 凯文 · 夸克 A lot of people like to have the option of having a

  • tensorflow1.0基础操作2020-03-11 15:42:14

    tensorflow1.0 一些操作 打印所有节点: [n.name for n in tf.get_default_graph().as_graph_def().node] save parameter to dict: model_save = {} variables = tf.get_collection('variables') for var in variables: name = var.name name = name.split(":"

  • 【转载】 tensorflow batch_normalization的正确使用姿势2020-03-08 20:06:28

    版权声明:本文为博主原创文章,遵循 CC 4.0 BY-SA 版权协议,转载请附上原文出处链接和本声明。本文链接:https://blog.csdn.net/computerme/article/details/80836060   ————————————————        BN在如今的CNN结果中已经普遍应用,在tensorflow中可以通过tf.layers

  • Mysql(Mariadb)数据库之Information Schema 库中GLOBAL_VARIABLES表 and SESSION_VARIABLES 表分析2020-03-05 16:57:05

    Information Schema GLOBAL_VARIABLES and SESSION_VARIABLES Tables The Information Schema GLOBAL_VARIABLES and SESSION_VARIABLES tables stores a record of all system variables and their global and session values respectively. This is the same information

  • Probabilistic Graphical Modeling概率图模型学习笔记2020-02-29 19:42:30

    Probabilistic Graphical Modeling概率图模型学习笔记0. learning materials1. Introduction2. Representation2.1 Bayesian network2.2 Markov Random Fields2.3 Conditional Random Fields2.4 Factor Graph 0. learning materials stanford CS228 notes Simulation tool

  • MySQL技术内幕InnoDB存储引擎 --笔记 201707072020-02-28 21:07:07

    mysql 5.6 原生Online DDL解析 online ddl 工具之pt-online-schema-change 用法介绍: pt-online-schema-change [OPTIONS] DSN options 可以自行查看 help,DNS 为你要操作的数据库和表。这里有两个参数需要介绍一下: --dry-run 这个参数不建立触发器,不拷贝数据,也不会替换原表。只

  • SystemVerilog Static Variables & Functions2020-02-25 12:41:24

    每个类实例通常都具有其每个内部变量的副本。 class Packet; bit [15:0] addr; bit [7:0] data; function new (bit [15:0] ad, bit [7:0] d); addr = ad; data = d; $display ("addr=0x%0h data=0x%0h", addr, data); endfunction endclass mo

  • RestTemplate的异常 Not enough variables available to expand2020-01-29 21:01:06

    当使用 RestTemplate 可能会遇到异常: Not enough variables available to expand 典型如下: @Autowired private RestTemplate restTemplate; String url = "http://localhost:8080/search?people={\"name\":\"jack\",\"age\":18}"; Strin

  • Book: The TimeViz Browser2020-01-21 22:54:41

    website;  A visual survey of visualization techniques for time-oriented data. 1. Left pannel ----- filter of visualization techniques;  Number of variables: univariate; multivariate; Arrangement: linear; cyclic; Time primitives: instant, interval; Visuali

  • Activiti进阶API操作2020-01-16 14:02:53

    历史数据查询 查询历史流程实例列表 HistoricProcessInstanceQuery query = pe.getHistoryService() .createHistoricProcessInstanceQuery(); List<HistoricProcessInstance> list = query.list(); for (HistoricProcessInstance hi : list) { System.out.printl

  • Day4 - H - Following Orders POJ - 12702020-01-09 13:03:48

    Order is an important concept in mathematics and in computer science. For example, Zorn's Lemma states: ``a partially ordered set in which every chain has an upper bound contains a maximal element.'' Order is also important in reasoning abo

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