运算符 身份is
1130 - Host 'xxx' is not allowed to connect to this MySQL server
安装mysql-5.7.32数据库时，使用Navicat工具连接数据库时，出现Host 'xxx' is not allowed to connect to this MySQL server，详情如下： 两种解决方案，任选一个即可： 1、修改mysql数据库用户表数据 执行如下SQL命令： use ......
The JSON value of length n is too large and not supported
https://github.com/dotnet/runtime/issues/39953 I'm referring to this issue #30746 that was closed with limit of 125MB staying fixed opposed to being c ......
Docker启动报错：Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
问题描述： Docker启动报错：Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? Cannot connect to the Docker daemon ......
numpy的数组运算，切片以及布尔类型索引以及花式和转置
数组运算 import numpy as np # 创建两个数组 data_0 = np.array([[1,2,3],[4,5,6]]) data_1 = np.array([[5,6,7],[7,8,9]]) # 将两个数组进行相加 data_0 + data_1 输出结果为: array([[ ......
栈实现算术优先级运算c++
#include <stdlib.h> #include <stdio.h> #include <iostream> using namespace std; #define STACK_INIT_SIZE 100 //栈初始开辟空间大小 #define STACK_INCREMENT 10 //栈 ......
sonarqube启动报错：You must address the points described in the following [2] lines before starting Elasticsearch.bootstrap check XXXmax numberXXXfor user[sonar] is too low .XXX check the logs at XXX/.log
You must address the points described in the following [2] lines before starting Elasticsearch.bootstrap check failure [1] of [2]: max number of threa ......
command line is too long错误
进入idea项目的.idea目录下，找到workspace.xml文件， 找到标签 <component name="PropertiesComponent"> </component> 在其中添加: <property name="dynamic.classpath" value="true" / ......
Vivado生成bitstream时报错[Opt 31-67] Problem: A LUT3 cell in the design is missing a connection on input pin I1, which is used by the LUT equation
这个原因主要是因为有一个引脚没有用到，解决方法。 1、打开Schematic。 2、根据提示的模块去找，比如说我的报错。 [Opt 31-67] Problem: A LUT3 cell in the design is missing a connection on input pin I1, w ......
基本运算
基本运算 一、算术运算符 x = 10 y = 20 print(x + y) #30 print(x - y) #-10 print(x * y) #200 print(x / y) #0.5 print(x % y) #10 print(x // y) #0 print(x ** y) #100 ......
TypeError: Object of type 'Animal' is not JSON serializable/ 自定义对象 转json串
import jsonclass Animal(object): def __init__(self): self.name = 'tom' def __repr__(self): return f'my name is {self.name}&i like apple'd1 = { 'county ......
error: Microsoft Visual C++ 14.0 is required. Get it with "Build Tools for Visual Studio": https://visualstudio.microsoft.com/downloads/
error: Microsoft Visual C++ 14.0 is required. Get it with "Build Tools for Visual Studio": https://visualstudio.microsoft.com/downloads/ 一、背景说明 在编译安装 ......
response status is 404 /swagger/v1/swagger.json
原因： 配置Swagger处的信息错误导致 本次是两处的版本配置不一致导致如下 解决： 保持两处的版本一致，可以将前面的“V1”大写改成与后面一致的小写“v1”， 也可两处都改为大写 ......
运算符重载
运算符重载 1 概述 C++规定运算符重载必须针对类的对象，即重载时至少有一个参数是对象，如A、const A、A &等等。没有对象就new一个出来。 C++用operator加运算符进行。对于普通运算符成员函数，this隐含参数代表第一个操作数对象。运算符可分为： 不能重载：sizeof、.、.* ......
以下是一个简单的HTML代码示例，演示如何实现分身份登录（用户登录和管理员登录）
<!DOCTYPE html><html><head> <title>分身份登录</title></head><body> <h2>用户登录</h2> <form action="user_login.php" method="post"> <label for="user_username">用户 ......
! CocoaPods 1.10.0 out of date (1.11.0 is recommended).
[!] Xcode - develop for iOS and macOS (Xcode 14.2) ! CocoaPods 1.10.0 out of date (1.11.0 is recommended). CocoaPods is used to retrieve the iOS and m ......
What is FinOps?
What is FinOps? In this article Partnership with the FinOps Foundation What is the FinOps Framework? Principles Stakeholders FinOps is a discipline th ......
Linux-Shell 小数运算，四舍五入
在shell中做小数运算，可以借助bc 或者awk工具 一、使用bc做小数运算，scale指定小数点位数 1、加法运算（scale参数无效） #echo "5.999 + 5.001"|bc 6.000 #echo "5.111+ 5.1114"|bc 10.2224 运算结果小数点位数以加数中最大 ......
Failed to stop auditd.service: Operation refused, unit auditd.service may be requested by dependency only (it is configured to refuse manual start/stop).
[root@7 ~]# systemctl stop auditd.service Failed to stop auditd.service: Operation refused, unit auditd.service may be requested by dependency only (i ......
运算符 列名*1.1 case when... then ..when.. then ..else.. end
select ENAME as '姓名',SAL as '原始工资', (SAL*1.1) as '涨工资10%'from emp where job='MANAGER'; # 经理涨薪%10，销售涨薪%50 其余不变 需要使用 case when then when then else end s ......
umount.nfs4: /home/videorec/sharedir: device is busy
用umount取消挂载时报错设备繁忙：device is busy。原因是还有进程在打开目录下的文件，可以先杀死进程，再卸载，或者强制卸载 umount 使用umount强制卸载，参数如下： -l --lazy，立即断开文件系统，所有清理后面执行。实际上就是延迟卸载，该挂载已从文件系统名称空间中删除 ......
Expression #3 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'jira.ji.ID' which is not functionally dependent on columns in GROUP BY clause;only_full_group_by
这个报错的完整信息 Expression #3 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'jira.ji.ID' which is not functionally dependent on ......
CentOS7 虚拟机 ping network is unreachable
ping 指令提示network is unreachable 重启网络报错 尝试禁用重启网络的方式无效 直接dhclient -v指令解决。。。 ......
What is click event?
先不去讨论它语法、原理，先描述一下它的功能性， Click event想要实现的效果是？ 开发者在UI界面上放置一个按钮， 并且开发者写了一段功能函数， 当有人点击了这个UI按钮，就会自动去执行这段功能函数。 这就是点击按钮想要的效果。 点击事件的实现原理思考 常见的按钮点击事件的简要实现原理: / ......
JavaScript的数字运算不准的问题
JavaScript的运算问题存在两方面： 第一个表示不准问题： 打开浏览器按F12，在Console里， 输入0.1+0.2=0.30000000000000004 输入91.25*0.7 =63.87499999999999 解决这个问题，要用第三方库math.js 或 decimal.js c ......
请在课上练习的基础上，实现输出加减法混合的运算题目列表。请提交代码及运行效果截图。
import java.util.Random;public class MathOperationGenerator { public static void main(String[] args) { int numberOfQuestions = 10; // 指定生成题目的数量 genera ......
myabtis事务synchronization is not active打印日志位置
经常见日志里的有 Creating a new SqlSession Registering transaction synchronization for SqlSession 或者 Creating a new SqlSession SqlSession was not registered f ......
[Compose] Callback is not suitable for Async programming
An example of callback implemnetation for handling async flow: function fakeAjax(url, cb) { var fake_responses = { file1: "The first text", file2: "Th ......
select 里列运算 求年薪
表的列是支持运算符的 起别名时需要加单引号 # 获取年薪desc emp;select ENAME,SAL*12 as '年薪' from emp; ......