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低功耗蓝牙BLE
2021-11-21
1.Asscientistspredicted,globalpollutionhasbecomeoneofthemostseriouspro
ble
msfacingthehumanrace.2.Competitionforseekingthesepositionsistough
预防一班单杰民
·
2024-03-12 04:05
PostgreSQL开发与实战(6.2)体系结构2
作者:太阳二、逻辑架构graphTDA[database]-->B(schema)B-->C[表]B-->D[视图]B-->E[触发器]C-->F[索引]ta
ble
space三、内存结构Postgres
云掣YUNCHE
·
2024-03-12 01:15
Postgresql开发与实战
postgresql
数据库
MySQL表锁与行锁
//MyISAM查看表的情况:showopenta
ble
s;加锁:lockta
ble
表名read(write),表二read(write);释放锁:unlockta
ble
s;分析表锁定:showstatuslike'ta
ble
信缘 ꈍ 随缘
·
2024-03-12 01:15
mysql
数据库
java
Centos6.5,Centos7分别关闭selinux和防火墙
Centos6.5关闭selinux:永久有效:修改/etc/sysconfig/selinux将文本中的SELINUX=enforcing,改为SELINUX=disa
ble
d。
有事找叮当
·
2024-03-12 00:47
Spring Cloud GateWay整合熔断器实现限流
SpringCloudGateWay-过滤器今天我们来说下网关如何限流,主要两种方案:SpringCloudGateWay整合hystrxenvironment:testmanagement:security:ena
ble
d
暮色里de白雪檐
·
2024-03-12 00:14
springcloud
#
java核心知识点
网关
hystrx
限流
CircuitBreaker
gateway
Using DataContext to Track Changes and Cache Objects
TheDataContextobjectmanagesobjectidentityforyousothatrowsretrievedfromthedatabaseta
ble
areautomaticallyloggedintheDataContextobject
weixin_33872566
·
2024-03-11 21:08
数据库
Linux Shell变量的定义和使用
例如:my_varia
ble
="Hello,World!"这里,我们定义了一个名为my_variab
黑风风
·
2024-03-11 15:15
Linux
Shell
linux
运维
服务器
开发指南002-前后端信息交互规范-返回类ResponseResult
返回类有两个,一般返回类ResponseResult和分页返回类PageResult,本篇介绍ResponseResultpublicclassResponseResultimplementsSerializa
ble
大道不孤,众行致远
·
2024-03-11 10:07
平台开发指南
交互
java
开发语言
一起学算法-1217. 玩筹码
一、题目LeetCode-1217.玩筹码地址:https://leetcode-cn.com/pro
ble
ms/minimum-cost-to-move-chips-to-the-same-position
Justin小贾同学
·
2024-03-11 09:20
Sqoop一些常用命令及参数
importImportTool将数据导入到集群exportExportTool将集群数据导出codegenCodeGenTool获取数据库中某张表数据生成Java并打包Jarcreate-hive-ta
ble
CreateHiveTa
ble
Tool
大数据小同学
·
2024-03-11 09:19
随机森林原理&sklearn实现
原理定义随机森林就是通过集成学习的思想将多棵树集成的一种算法,它的基本单元是决策树,而它的本质属于机器学习的一大分支——集成学习(Ensem
ble
Learning)方法。
一稻道人
·
2024-03-11 06:03
机器学习算法&预测模型
Python
随机森林
sklearn
算法
Hashta
ble
排序
Hashta
ble
内部排列的方式是散列排布,所以当输出信息时会是无序的。为了能保证输出的数据按照顺序排列,不要渴望用java自带的函数来对Hashta
ble
对象进行调整处理。
Roy_Sashulin
·
2024-03-11 03:29
J2se
object
java
“ERROR Resource temporarily unavaila
ble
“ 和 “ERROR Connection reset by peer“ 是两种常见的网络错误
“ERRORResourcetemporarilyunavaila
ble
”和“ERRORConnectionresetbypeer”是两种常见的网络错误,它们通常在网络通信中出现。
sunfanup
·
2024-03-11 02:27
linux开发
c
c++
网络
服务器
在CentOS系统中安装Nginx
sudoyuminstallepel-release3.安装Nginx:sudoyuminstallnginx4.启动Nginx服务:sudosystemctlstartnginx5.设置Nginx服务自启动:sudosystemctlena
ble
nginx6
乌拉~~
·
2024-03-10 23:54
nginx
centos
linux
docker基本命令
Dockersystemctlstartdocker停止Dockersystemctlstopdocker重启Dockersystemctlrestartdocker开机启动Dockersystemctlena
ble
docker
酒吴
·
2024-03-10 22:52
docker
docker
spring中的事件
下表列出了Spring提供的标准事件:EventExplanationContextRefreshedEvent在ApplicationContext被初始化或刷新时发布(例如,通过使用Configura
ble
ApplicationContext
一切顺势而行
·
2024-03-10 20:50
spring
AcWing 95. 费解的开关
Pro
ble
m:AcWing95.费解的开关文章目录思路解题方法复杂度Code思路这是一个经典的搜索问题。我们需要找到最少的步骤来使所有的灯都亮起来。
爱跑步的程序员~
·
2024-03-10 15:44
刷题
acwing
dfs
linux取消密码复杂度限制 笔记240306
linux取消密码复杂度限制echoroot|passwd--stdinroot在Linux系统中,密码复杂度通常是由PAM(Plugga
ble
AuthenticationModules)来控制的。
kfepiza
·
2024-03-10 15:14
#
Linux
CentOS
Ubuntu
等
linux
笔记
运维
WSL2-在Ubuntu-22.04上安装MySQL(deb包)并配置ODBC
启用systemd通过链接启用systemdhttps://learn.microsoft.com/zh-cn/windows/wsl/systemd#how-to-ena
ble
-systemdsudonano
601.373336
·
2024-03-10 14:43
数据库
ubuntu
mysql
linux
db
Docker Register 搭建私有镜像仓库
docker组件sudoaptinstalldocker.io(3)启动docker服务sudosystemctlstartdocker(4)设置docker服务开机自启动sudosystemctlena
ble
docker
Vane Zhang
·
2024-03-10 11:37
docker
docker
容器
【算法随笔:HDU 3333 Turing tree】(线段树 | 离线 | 离散化 | 贪心)
https://acm.hdu.edu.cn/showpro
ble
m.php?pid=3333https://acm.hdu.edu.cn/showpro
ble
m.php?
XNB's Not a Beginner
·
2024-03-10 07:03
算法
算法
哈希算法
leetcode
c++
排序算法
LeetCode-136-只出现一次的数字
示例1:输入:[2,2,1]输出:1示例2:输入:[4,1,2,1,2]输出:4来源:力扣(LeetCode)链接:https://leetcode-cn.com/pro
ble
ms/single-number
刻苦驴哝
·
2024-03-10 07:54
2018-10-30jquery实际应用
;$("#ssb").attr("disa
ble
d",true);returnfals
小牛长成记
·
2024-03-10 05:11
数据结构与算法-哈希表
哈希表(HashTa
ble
)是一种通过哈希函数将键(key)映射到特定数组索引位置的数据结构,以实现对数据的高效存储和检索。通过巧妙地设计哈希函数,
时光不老c
·
2024-03-10 04:59
数据结构与算法
算法
数据结构
java
JPG TO PDF(用python将图片转换为pdf格式)
fromtkinterimportttkimportrandomimporttkinterastkdefhp(width,height):hp=Tk()hp.title("JpgToPdf")hp.resiza
ble
hhcgchpspk
·
2024-03-10 02:27
python
开发语言
数据结构与算法-双向链表
一、基本介绍定义双向链表(Dou
ble
-LinkedList)是链表家族的一员,相比于单链表,它的每个节点不仅包含数据域,还具备两个指针域,分别指向前一个节点和后一个节点。
时光不老c
·
2024-03-10 00:54
数据结构与算法
java
数据结构
算法
C/C++编程:前置声明
forwarddeclaration)是类、函数和模板的纯粹声明,没伴随着其定义.一般的前置函数声明#includeusingnamespacestd;voidfun(charch,int*pValue,dou
ble
dValue
OceanStar的学习笔记
·
2024-03-09 21:51
C++
c++
c语言
算法
Armadillo使用介绍(八):第二个Armadillo程序
源码#include#includeusingnamespacestd;usingnamespacearma;//Armadillodocumentationisavaila
ble
at://http:/
UPUPUPEveryday
·
2024-03-09 15:44
Armadillo
armadillo
c++
vs
线程相关及其使用
线程的状态及其转变方式:线程的状态主要有五种:新建(New)、就绪(Runna
ble
)、阻塞(Blocked)、等待(Waiting)、超时等待(TimedWaiting)和终止(Terminated)
山间漫步人生路
·
2024-03-09 04:29
java
开发语言
线程
SpringMVC中接收参数总结
=参数名时,需要写该注解@RequestParam,其中三、一名多值的情况使用list时,需要用到该注解@RequestParam,将集合add加入对应数据类型@PathVaria
ble
@RequestBody
落云生
·
2024-03-09 01:55
SSM
java
spring
spring
boot
【LeetCode】389_找不同_C
https://leetcode.cn/pro
ble
ms/find-the-difference/description/示例示例1:输入:s="abcd",t="abcde"输出:"e"解释:'e'是那个被添加的字母
长白秋沙
·
2024-03-08 21:20
算法刷题笔记
算法刷题
使用边宽度的输出字段
#includevoidmain(){unsignedwidth,precision;intnumber=256;dou
ble
weigth=243.5;printf("whatfieldwidth\n"
小风xf
·
2024-03-08 21:32
IOS开发0基础入门UIkit-3--实现一个高度自适应的UILabel和一个宽度自适应的UILabel
1.实现一个高度自适应的UILa
ble
思路:UILabel初始化之后,先不要设置他的宽度和高度,等到设置好text属性和font属性之后,根据text的长度以及font的大小来计算UILabel控件的高度
Z编程
·
2024-03-08 17:42
ios-UIkit入门
ios
计算阶乘后的0
refer:https://leetcode.cn/pro
ble
ms/factorial-trailing-zeroes/description/?
许墨の小蝴蝶
·
2024-03-08 16:11
算法
自动化运维工具----Ansi
ble
入门详解
一、Ansi
ble
简介什么是Ansi
ble
?
效好飞
·
2024-03-08 11:05
自动化运维工具
运维
自动化
ansible
Sta
ble
Diffusion Automatic1111正式支持Tensorrt
今天在AI绘画的开源平台Automatic1111上发布了Tensorrt项目,项目地址是https://github.com/AUTOMATIC1111/sta
ble
-diffusion-webui-tensorrt
germandai
·
2024-03-08 10:33
人工智能
stable
diffusion
sql初级题_初级开发人员不要避免学习SQL,您将需要它
WheneverImeetjuniordevelopers,usually,theyeitherhavenoideaaboutSQLortheyhaveverylimited,practically-unapplica
ble
knowledge
weixin_26739079
·
2024-03-08 08:30
sql
mysql
我是90后,我拒绝投资房地产,选择了BTC…
我是90后,我拒绝投资已经充满危险和bub
ble
的房地产,2018年,我把原先准备买房的资金,开始进入币圈,投资BTC…是泡沫吗?
菠萝头研究员
·
2024-03-08 06:12
介绍Node.js+Electron框架下和常用(HID 串口
BLE
)硬件通信方法
介绍框架下的模块node.jsNode.js®是一个开源的、跨平台的JavaScript运行时环境。能通过node插件直接js调用c++(内置v8)Node.js(nodejs.org)electronElectron可以让我们使用纯JavaScript调用丰富的原生API来创建桌面应用。可以内嵌reactvue等前端框架,直接将web页面转换成桌面客户端程序。Electron|使用JavaScr
古木12345
·
2024-03-08 03:55
分享
node.js
electron
javascript
No
ble
st brain‘s death
图片发自App如果有人必须死亡,有人仍得活着如果失去造就懂得,毁灭唤醒怜心如果我已老去,或者未曾出生受折磨的人,祭品,尚未动容我,低贱的魂魄,胆敢屈服?
胧一
·
2024-03-08 01:36
thumb 垂直seekbar 居中_Android 垂直SeekBar
importandroid.content.Context;importandroid.graphics.Canvas;importandroid.graphics.Rect;importandroid.graphics.drawa
ble
.Drawa
ble
weixin_39788740
·
2024-03-08 00:52
thumb
垂直seekbar
居中
C语言自定义函数求三项数值中的最大数
#include//自定义max函数dou
ble
max(dou
ble
a,dou
ble
b,dou
ble
c){dou
ble
z;z=a<b?a:b;return(c<z?
苏切尔
·
2024-03-08 00:22
c语言
qml 表格Ta
ble
View 创建
1.自动生成表格,函数调用如下://自动生成表格functionupdateColumn(arrayData){if(arrayData.length3){vararrayTypes=arrayData[3];//表格Item的类型}if(arrayTitle.length!==arrayWidth.length||arrayTitle.length>arrayRoles.length){cons
「已注销」
·
2024-03-07 19:14
qt_qml
c++
前端
MFC:基于OPenGL的三维渲染控件样例代码
opengl类Myopengl.h#pragmaonce#include#pragmacomment(lib,"glut64.lib")#defineGLUT_DISA
BLE
_ATEXIT_HACK#include"glut.h"classMyopengl
pdycp
·
2024-03-07 19:43
opengl
mfc
c++
【七】【SQL】自连接
mysql>select*fromsalgrade,salgrade;ERROR1066(42000):Notuniqueta
ble
/alias:
妖精七七_
·
2024-03-07 17:41
数据库SQL
sql
数据库
局部变量和全局变量
局部变量和全局变量的介绍局部变量和全局变量其实更加准确点应该叫做内部变量和外部变量(在数据段内(变量也在))(Localvs.globalvaria
ble
s)内部变量和外部变量重名(编译器不报错)内部变量的
陆小果不会写代码
·
2024-03-07 16:40
算法
c语言
MySql的CURRENT_TIMESTAMP和ON UPDATE CURRENT_TIMESTAMP
CREATETA
BLE
`voyage_ma`.
醉卧沙场丶
·
2024-03-07 15:38
mysql
数据库
机器学习-02-机器学习专家系统
总结本系列是机器学习课程的第02篇,主要介绍机器学习中专家系统的应用介绍本门课程的目标完成一个特定行业的算法应用全过程:定义问题(Pro
ble
mDefinition)->数据收集(DataCollection
IT从业者张某某
·
2024-03-07 12:04
2024年机器学习
机器学习
人工智能
mysql 中的一些重要函数
showcreateta
ble
user_profile查看表结构1.datediff(end_date,start_date)函数,now(),curdate()curtime()date_add(日期
一切顺势而行
·
2024-03-07 11:34
mysql
数据库
sql执行计划需要关注那些内容?
1、id:执行计划中每个操作的唯一标识,多表联查的时候会出现多条数据id是一样的2、select_type:查询类型,常见类型有:SIMPLE、PRIMARY、UNION、SUBQUERY3、ta
ble
注。
·
2024-03-07 09:01
mysql
sql
数据库
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