04 2023 档案
摘要：MySQL create table new_table select c1,c2 from old_table [where 1=2] lose index, auto_increment create table new_table like old_table table structure
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摘要：connection import psycopg2 from psycopg2 import Error, connection, cursor conn: connection | None = None c1: cursor | None = None try: conn = psycopg2
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摘要：Pool 使用pool正确方法: 从pool取connection,使用完close(), 底层CMySQLConnection会return到deque, 此时从pool中得到的PooledMySQLConnection底层_cnx变为None
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摘要：String workspace = "/opt/jenkins/workspace/${JOB_NAME}" def v = 'v' env.e1 = 'v1' pipeline { agent { node { label 'master' customWorkspace "${workspac
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摘要：1. push.default https://www.fleekitsolutions.com/difference-between-push-default-matching-simple/ Set your push.default to upstream to push branches t
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摘要：Snippet Generator => steps (place into the steps) 只有脚本script{}可声明变量,String,def声明的变量只有script{}可用 # # Plugins # # Organization and Administration Config
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摘要：package main import ( "fmt" "math" "runtime" "strconv" "strings" "time" ) func producer(intChan chan int) { for b := 1000; b <= 1099; b++ { intChan <-
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摘要：contra-variance from typing import Callable class Food: ... class Meat(Food): ... class Animal: def eat(self, food: Food): ... class Dog(Animal): def
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摘要：keyword must be strings
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摘要：C int arr[5]; brackets must follow the identifier, definition of variable with array type needs an explicit size of an initializer
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摘要：slice, map即使为nil打印格式和空元素的情况一样, chan,func,interface,pointer为nil时,打印<nil> 当chan,func,pointer赋值后,都打印地址, interface赋值后,永远打印其dynamic value的格式 package main i
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摘要：Java arr本质是一个数组,可直接传数组,引用类型,可能为null JavaScript Function length rest parameter Go
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摘要：C Java == 基本数据类型时, two operands类型不同时, 必须可以进行自动类型转换, e.g. byte & char => int, 不能进行自动类型转换(boolean & char)则编译失败, == 不能比较基本类型和引用类型, 基本数据类型只有boolean不能与其他7个
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摘要：man [options...] [SECTION] PAGE... -l --local-file interpret PAGE arguments as local filenames man -l /usr/share/man/man1/ls.1.gz
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摘要：env in jenkins controller Jenkins dynamic slave agent Pod Template in Jenkins UI Example from git pipeline { agent { kubernetes { cloud 'kubernetes' d
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摘要：$@ "$@" $* "$*" a.sh echo "$@" echo $@ echo "$*" echo $* b.sh "$@" b.sh $@ b.sh "$*" b.sh $* b.sh echo $# for param; do echo "param = $param" done
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摘要：C goto Must be defined within a function Each label in one function must have a unique name. It cannot be a reserved C keyword C has a separate namesp
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摘要：The switch expression has an additional lambda-like syntax and it can be used not only as a statement, but also as an expression that evaluates to a s
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摘要：In Java, C, $ is valid In Go, Python, $ is invalid
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摘要：def get_public_ip(): from urllib.request import urlopen import re as r d = urlopen('http://checkip.dyndns.com').read() return r.compile(r'(\d+\.\d+\.\
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摘要：< file cat dd iflag=nonblock status=none if=file printf '%s' "$(< file)" cp file /dev/stdout awk '{print}' file sed '' file
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摘要：groupadd & useradd They all have --root CHROOT_DIR AND --prefix PREFIX_DIR
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摘要：HISTCONTROL variable is a colon-separated list of values controlling how commands are saved in the history list. HISTCONTROL=ignoredups It causes line
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摘要：ssh-keyscan - gather ssh public keys from servers /etc/ssh/ssh_config => HostKey 有系统内置的key options -c Request certificates from target hosts instead o
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摘要：Disable all auth (in case of Security Realm wrong configuration) Go to $JENKINS_HOME, modify config.xml REST API # acquire crumb curl -fsSL -XGET -uje
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摘要：apiVersion: v1 Kind: pod apiVersion: v1 kind: Pod metadata: annotations: kubeadm.kubernetes.io/kube-apiserver.advertise-address.endpoint: 192.168.8.11
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摘要：'import *' only allowed at module level When Python compiles code it needs a determined number of local variables, The number of variables that import
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摘要：insecure-registry export DOCKER_OPTS+=' --insecure-registry localhost'
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摘要：imagePullSecrets # using config.json kubectl create secret generic secret-docker \ --from-file=.dockerconfigjson=<path/to/.docker/config.json> \ --typ
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