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2.0.2-Reaper piano roll zoom and scroll settings
0
1993
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Reaper piano roll zoom and scroll settingsHorizontal scaling settingsO...
OSI Model - Transport Layer
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transport layerTransport layer overviewThe transport layer provides en...
Azure Maps Service joins public transit service
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1993
2
Microsoft has added the Mobility Service to the Azure map service, all...
Uber pushes mobile speed data service in face of complex traffic battle in cities
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1993
2
Uber announced the release of the movement speed data service Movement...
ubuntu16.04 has no sound
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1993
2
sudo apt-get install pavucontrol alsa-utilsAlsamixer F6 selects the so...
ubuntu18.04 no sound solution
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1993
2
1. sudo apt install pavucontrol 2. sudo pavucontrolBasically, you just...
mysql unique index multiple null_MySQL allows adding multiple NULL values in a unique index field
0
2005
2
I was having dinner today, and a friend raised a question he encounter...
How does Spring Boot prevent duplicate submissions
0
2023
2
How does Spring Boot prevent duplicate submissionsScenario: The submis...
Distributed system interface, how to avoid repeated submission of forms?
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2065
2
How to implement a system that carries more users has always been a te...
Injection failure problem when using @Component and using @Resource or @Autowired
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2079
2
forewordUnder @Componentthe annotated class, @Resourcethe or @Autowire...
Talking about the problem of judging whether a variable is empty in Java
0
2073
2
Java's StringUtil.isEmpty(str) and "".equals(str) are both methods u...
Jenkins integrates SonarQube for code quality scanning
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3
I. Introduction1. Main content of this articleJenkins integrated Sonar...
Install & configure PostgreSQL 12 on CentOS 7
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2
I. Introduction1. Main content of this articlePostgreSQL 12 installati...
System.Net.Mail.SmtpClient fails to send emails via SSL/TLS protocol
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2087
2
1. Problem description1. Problem phenomenonSending mail by System.Net....
How to design API return code (error code)?
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2107
2
I. IntroductionWhen the client requests the API, it usually needs to u...
Talk about the advantages and disadvantages of stored procedures and usage scenarios
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2099
2
1. What is a stored procedureStored Procedure (Stored Procedure) is in...
DataIntegrityViolationException, DataConversionException abnormal solution
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2091
2
1. Problem phenomenonWhen using MyBatis to query data, an exception oc...
Solve the problem of PostgreSQL installation failure under macOS
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2153
2
1. Phenomenon and reasons1. Problem phenomenonProblem running post-ins...
Use of multiple python/pip versions and uvicorn on Windows
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2125
2
Use multiple versions of python, pip on windows and some things that n...
About time synchronization settings of Ubuntu server
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2097
2
First, we check the server's time zone setting and current time value,...
Crontab fails to execute docker exec background task in ubuntu
0
2103
2
Several background tasks were added to the crontab task. After a few d...
The docker container adds custom hosts and restarts the loss problem
0
2089
2
Manually modify the hosts in the docker container to add some domain n...
Python global constants are alternative implementation methods for cross-file global variables
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2079
2
Constants are variables that do not change. In Python, constants are u...
git creates and pulls project branches
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2085
2
Git creates a branch, which can be created through the visual operatio...
Class variables in depends in FastAPI cause problems passing data across request sessions
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2109
2
In a python server project built using FastAPI, depends is used in the...
Install mongodb replica set
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2113
2
The steps to install mongodb replica set are as follows:1. Enter the d...
How to reduce server-side memory consumption using Node.js Stream API?
0
2137
2
Let's look at an example that shows the huge advantages of using strea...
3 ways to optimize Tomcat performance in high concurrency environment
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2089
2
As the most commonly used Java web server, Tomcat's performance will d...
Use grep and sed to intercept logs for a period of time
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2107
2
Assuming the log name: out.log, the way to record the date and time in...
How to use redis to achieve multi-level cache synchronization
0
2135
2
forewordA while ago, I participated in the technical plan review of th...
How to test asynchronous tasks?
0
2113
2
Always get this question:How to test asynchronous tasks?How to test th...
Why do microservices have to have a gateway?
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2167
2
1. What is a service gatewayService gateway = route forwarding + filte...
The logger records are displayed on the console, but the troubleshooting is not displayed in the log output file
0
2107
2
Scenes:In the code, logger.info is used to output data to the specifie...
Processing of multipart/form-data request failed. No space on device
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2139
2
2022-12-23 15:01:04 [http - nio -9001-exec-4] [com.data.manger.common....
How RabbitMQ ensures message sending and message receiving
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2127
2
Message sending confirmation:1. ConfirmCallback methodConfirmCallback ...
The difference between dynamic agent JDK and CGLib?
0
2121
2
JDK and CGLib dynamic proxy analysisSince Java1.3, Java has provided d...
User duplicate registration analysis - bugs caused by locking in multi-threaded transactions
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2099
2
a recurring processOnline client users need to bind a mobile phone num...
Download database mysql appears: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
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2171
2
Download the database mysql appears: Unable to fetch some archives, ma...
Flask session storage is configured in redis
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2157
2
#session is stored in redis cache # sessionis valid for a long time, i...
Solution: In the flask file, from werkzeug import secure_filename, FileStorage reports an error cannot import name 'FileStorage'
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2099
2
Solution: In the flask file, from werkzeug import secure_filename, Fil...
Let MySQL statement prompt and highlight (mycli)
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2123
3
Just downloaded the database, no prompt or highlight:download myclipip...
WINserver2003 installs multiple services, but only the last installed one can be seen in the management tool
0
2097
2
The picture below is the picture after matching.In a similar situation...
Record: Error 14 under CentOS7: curl#6 - "Could not resolve host: mirrorlist.centos.org; unknown error" - solution
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2097
2
Such an error occurs when centos installs vim, please refer tohttps://...
Unable to remotely log in to the root user of centOs
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2107
2
Configure sshd_configlocal computer:vim /etc/ssh/sshd_configRemove the...
wget download redis version 5.0.14
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2099
2
wget https://download.redis.io/releases/redis-5.0.14.tar.gz
Python connect to mysql database
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2105
2
Install the pymysql management tool firstpip install pymysqlwrite a py...
SpringBoot integrates MybatisPlus to achieve addition, deletion, modification, query and paging
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2125
2
1. Introduction to Mybatis-plusWhy use MP?MyBatisPlus can save us a lo...
Elegant data synchronization--canal implements mysql synchronization demo
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2141
2
When data synchronization between two tables is required, how many sol...
How to achieve high performance praise
0
2097
2
Like is a small module of the whole system, and the code is under use...
View Redis information and status
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2095
2
After redis-cli connects to the server, use the info command to view R...
How to quickly deploy PHP Web environment (nginx php mysql redis)
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2185
2
First look at the final effect, as follows:What is it?It is docker con...
Understand the principle of Redis data storage, don't just set and get
0
2147
2
My core module is shown in Figure 1-10.Figure 1-10Client client, offic...
Mysql事物锁等待超时(Lock wait timeout exceeded; try restarting transaction)
0
2085
2
1. Problem descriptionWhen making a query statement, MySQL throws such...
When MySQL data retrieval, how to add serial number to the result of sql query
0
2087
3
1. SQL
[email protected]
: variable defined by type
[email protected]
:=0: This is similar t...
Why can't the columns in the original table be directly referenced after GROUP BY
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2444
0
SELECT column limit after GROUP BY Standard SQL stipulates that when ...
Are there any good optimization schemes for multi-tag retrieval?
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2323
2
Such as Taobao. A product has many tags (refers to the tag searched on...
The Spring environment gets the Spring Bean
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2115
2
1. Test data preparation/* Navicat Premium Data Transfer Source Serv...
SpringBoot uses Timer to execute tasks after 2 hours of the specified time
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2071
2
/** * @Description * @Author songwp * @Date 2022/8/5 12:51 * @Vers...
SpringBoot error connecting to redis:exception is io.lettuce.core.RedisException: java.io.IOException: remote host forced an existing connection to close
0
2163
2
1. Solutions(1). Check whether the configuration of redis is correctth...
SpringBoot Excel Import and Export
0
2099
2
1. Introduce pom.xml dependencies<!-- lombok --><dependency> <grou...
Configuring Front and Back End Interfaces with Nginx on Linux
0
2081
2
1. Edit the nginx.conf configuration file command## /usr/local/nginx/ ...
SpringBoot Xml to Json object
0
2083
2
1. Import the required dependencies<dependency> <groupId>maven</g...
SpringBoot project through maven after hitting into a jar package; how to use Docker to hit into an image
0
2085
2
1. An overview of mirroring and container-related knowledgeDocker imag...
Unable to Verify macOS Version? 5 Ways to Solve the Problem
0
2213
2
Is your computer unable to verify macOSversion? Are you wondering how ...
Mysql Database SQL Script Import
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2179
2
1. Enter the mysql command line windowmysql -uroot -p ***** *2. Displa...
Java Get the time difference between two times
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2091
2
In normal work, it is inevitable that you will encounter the differenc...
Use systemctl to set some services to start automatically: X.service is not a native service
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2079
2
When using systemctl to control some services such as installed EMQ, a...
Add support for WebSocket in Nginx configuration
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2073
2
Nginx has supported WebSocket since version 1.3, and can also do rever...
Clickhouse failed to start troubleshooting and found that the log file of the docker container was too large
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2093
2
Clickhouse fails to start and always exits after starting for a while....
Docker starts the container using gpu could not select with capabilities: [[gpu]].
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2097
2
When docker starts the container using gpu, it prompts an error: docke...
Use nethogs to view network bandwidth usage in Ubuntu
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2077
2
In Ubuntu 18.04, you can use nethogs to view the network bandwidth usa...
Ubuntu uses the nload command to view server network traffic
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2085
2
nload is a command-line tool that outputs Linux network traffic status...
Use of real-time traffic monitoring tool iftop
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2095
2
iftop is a real-time traffic monitoring tool that monitors TCP/IP conn...
IoT message queue Emqx log configuration and log tracking
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2097
2
EMQX supports outputting logs to the console or log files, or both. Us...
docker-compose prompts user specified IP address is supported only when connecting to networks with user configured subnets
0
2079
2
Some docker-compose.yml downloaded from the Internet encountered the f...
When docker logs in on the server, it prompts Error saving credentials: error storing credentials
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2087
2
Register at https://hub.docker.com/ before pushing the image package t...
A lot of software installed in yum in Centos8 server prompts No match for argument Unable to find a match
0
2091
2
I updated the source after encountering an error, but found that it st...
Some error records when pip installs sentence-transformers
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2101
2
I don’t know when I wrote down some of the records before, so I don’t ...
Linux uses the grep command to view logs for a specified period of time
0
2077
2
Today, I checked the problem of repeated orders. Since the order has b...
grep to view the lines before and after the specified string
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2087
2
After A, before B, before and after Cgrep -A 1 'process:' app-20211014...
There is a security vulnerability in OpenSSH security vulnerability before 8.5-openssh7.4 is upgraded to 9.0
0
2091
2
Third-party detection reports that OpenSSH before 8.5 has a security v...
Nginx header information vulnerability scanning various common vulnerability processing and repair methods
0
2087
2
Because the original business service used Nginx as a proxy, many head...
Specify the default source when Python uses pip to install the install module
0
2109
2
When I often install, I receive a prompt: WARNING: Retrying (Retry(tot...
Python uses RSA to implement asymmetric encryption and decryption
0
2093
2
Python needs to rely on the Crypto library to use RSA asymmetric encry...
Uncaught SyntaxError: Unexpected token '<' (at app.js:1:1)
0
2105
2
When using vue to build and run a project, I encountered a strange pro...
Get the Mac address of the server in the docker container - Python gets the Mac address of the server
0
2081
2
In the docker container, it is impossible to directly obtain the Mac a...
Nginx allows multiple domain names without using cross-domain access configuration with *
0
2087
2
When the browser initiates an ajax request to another domain name, the...
ERROR Error: Cannot find module 'vue-loader-v16/package.json' when building
0
2111
2
It is normal when npm run build is performed locally, but when it is u...
ESlint specification error in VUE Block must not be padded by blank lines padded-blocks
0
2095
2
When using VUE to write an async login method, it runs normally. After...
Python program requests reports Temporary failure in name resolution
0
2077
2
The business has been running normally before, but in the past few day...
Python program requests reports Temporary failure in name resolution
0
2079
2
The business has been running normally before, but in the past few day...
Docker-compose error Unsupported config option for services service: 'db'
0
2099
2
When using docker-compose for up -d installation, it prompts an error:...
The construction and use of the Minio graphical interface tool MinIO Console
0
2087
2
Minio is a very useful object storage system with simple operation, ex...
How to disable ping on Linux server
0
2081
2
If the server cannot be pinged, it is not necessarily because the serv...
rc.local on Centos7 does not execute when booting and git submits an error: warning: LF will be replaced by CRLF in.. problem
0
2079
2
Some startup commands were added to the startup file /etc/rc.local on ...
Navicat reports error MySQL server version for the right syntax to use near DEFAULT when adding fields to mysql table
0
2083
2
When using navicat to add fields to MySQL8, an error has been reported...
Gitlab takes up too much memory, configuration optimization to reduce gitlab memory usage
0
2083
2
I deployed gitlab on the newly purchased Alibaba Cloud 2C4G server, bu...
Use Docker to build SVN-server to provide SVN services
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2089
2
Gitlab takes up too much memory, and I personally only need its code s...
The operation process of using the command svnsync to completely migrate the SVN warehouse data
0
2085
2
The new server needs to synchronize the original SVN code, because it ...
Solve the problem of 300ms delayed click on the mobile terminal
0
2103
2
300ms delay on mobileWhy is there a 300ms delay in the click event of ...
Navicat remote connection server mysql
0
2123
2
forewordWhen the local Navicat connects to the database of the remote ...
Solve the problem that the port is occupied Web server failed to start. Port ×× was already in use
0
2095
2
This problem occurs because the port is occupied, just close the port ...
application.yml Common Basic Configuration
0
2079
2
forewordIn normal project development, I am more familiar with the wri...
Usage of telnet under windows
0
2091
2
forewordHere is a summary of how to use the Telnet command under Windo...
Configuring DNS for Linux
0
2085
2
Problem DescriptionThe domain name cannot be pinged, but the IP mapped...
oracle backup database data and import database
0
2091
2
1. Oracle database backup and import bat scriptscott oracle database u...
Windows Linking Mysql Setup via Local Computer IP
0
2107
2
foreword1. Mysql-1130 error: unable to connect remotelyError: ERROR 11...
How to configure multiple data sources based on springBoot project
0
2079
2
forewordSometimes, multiple data sources are used in a project. Now I ...
How to add a serial number to the result of a sql query when MySQL data is retrieved
0
2093
2
1. SQL
[email protected]
: variable defined by type
[email protected]
:=0: This is similar t...
Git code submission error (Your branch is up to date with 'origin/master)
0
2111
2
forewordToday, I submitted a local SpringBoot+Vue small project on Cod...
SpringBoot error connecting to redis:exception is io.lettuce.core.RedisException: java.io.IOException: remote host forced an existing connection to close
0
2101
2
1. Solutions(1). Check whether the configuration of redis is correctth...
Configuring Front and Back End Interfaces with Nginx on Linux
0
2107
2
1. Edit the nginx.conf configuration file command## /usr/ local /nginx...
Linux Enabling Firewall Port Policies
0
2081
2
1. Install a firewallyum install firewalld systemd -y2. Manually open ...
After the SpringBoot project is packaged into a jar package through maven; how to use Docker to create a mirror image
0
2071
2
1. An overview of mirroring and container-related knowledgeDocker imag...
Mysql database SQL script import
0
2119
2
1. Enter the mysql command line windowmysql -uroot -p ***** *2. Displa...
IDEA cannot search for plugin solutions
0
2257
2
forewordWhen I usually search for plug-ins in idea, I always load them...
How does java determine whether it is PC-side access or mobile-side access?
0
2113
2
Recently, I received a request. Since the original login page is for...
Java judges whether it is a mobile or PC request
0
2109
2
Mainly judged based on User-Agentrelevant verificationWeb sideapp side...
Java judges the request device type (ipad, iphone, android, windows)
0
2087
2
Judging whether it is a mobile terminal or a PC terminaltablet is a ta...
jquery 10 minutes countdown
0
2087
2
var ZC4 = { second: 600,//count down the total number of seconds ds...
Solution to lost updates under high concurrency
0
2099
2
1 backgroundKeywords: concurrency, lost updatesThere is a field for th...
Several js methods to achieve countdown
0
2079
2
1. Implement it with js setInterval, call the countdown function every...
Why is NGINX's reload not hotloading?
0
2103
2
During this time, I saw a discussion on Reddit, why does NGINX not sup...
How is JSX used in vue3?
0
2099
2
In the vast majority of cases, Vue recommends using template syntax to...
Video cache acceleration, 2.5x optimization
0
2111
2
backgroundVideo caching has become the standard for major videos, and ...
Why do developers write test cases?
0
2103
2
As a developer, you may find that the developers around you do not lik...
Filter Jackson JSON output based on Spring Security Role
0
2073
2
In this article, we will show how to filter JSON serialized output bas...
How does the frontend restrict user screenshots?
0
2095
2
Create together, grow together! This is my participation in the "Nugge...
Why do companies require all interfaces to use Post?
0
2099
2
Create together, grow together! This is my participation in the "Nugge...
No need for anti-shake and throttling, and a more low-level way to solve repeated requests of JS
0
2101
2
You may have encountered this situation in your project.Members A and ...
Front-end performance - 70% optimization for first load
0
2085
2
Project backgroundSmall and medium-sized projects, Vue-cli3 + vue2 + w...
How much does it cost to develop an app?
0
2113
2
How much does it cost to develop an app? I believe that not only custo...
Does the pathvariable annotation allow the parameter to be empty?
0
2097
2
Null cannot be allowed, but can be flexible. Recently encountered a si...
How to Create a Linux Virtual Machine with VMWARE
0
2131
2
PreambleHello everyone, I am a programming snail. As java developers, ...
Problems and solutions encountered in opening curl service in win7 wamp 64-bit php environment
0
2137
2
This article describes a simple way to open curl in PHP. Share for you...
Convert JSON format to YAML
0
2131
2
Below is a converter that converts JSON to YAML.In Node.jsTo convert J...
Common Causes of MySQL Startup Failures
0
2147
2
1. Unable to access system resources The inability of MySQL to acc...
Install Xcode 10.3 on macOS 10.13 High Sierra
0
2171
2
For some reason, my spare machine doesn't want to upgrade to macOS 10....
About RDS backup files using wget download prompting 403 Forbidden
0
2163
2
About the situation of using wget to download the RDS backup file and ...
Python version of GDAL installation
0
2217
2
Download the corresponding GDAL installation file according to the pyt...
Autodesk Licensing Service service restart failed
0
2237
2
The Autodesk Licensing Service service suddenly failed to start, causi...
Conflict resolution of git -- abort, continue, skip of git rebase
0
2193
2
Conflict resolution of git - abort, continue, skip of git rebaseThe or...
Why does Kafka, which is also a distributed architecture, need a Leader and Redis doesn't?
0
2223
2
The view that Redis does not need a leader is actually ambiguous and i...
jQuery - Scroll plug-in for Scroll that can still be displayed on mobile phones
0
2193
2
The Google Chrome scroller currently on mobile devices is temporarily ...
Django prompts Bootstrap4 not found
0
2207
2
Preface Bootstrap4 is installed directly in the python package in pych...
Using xlsx to report an error TypeError: n.indexOf is not a function
0
2209
2
The name of the table can only be a string, not a number. I directly u...
Use the Access-Control-Allow-Origin response header to resolve cross-domain requests
0
2181
2
For maximum performance, we all know that we can put our static files ...
C#/VB.NET realizes mutual conversion between Word and ODT documents
0
2211
2
The ODT document format is an open document format (OpenDocument Text)...
Detailed front-end and back-end separation project construction on the server (springboot+vue)
0
2247
2
Introduction: The classic front-end and back-end separation open sourc...
Mybatis Source Code Interpretation - Configuration Loading and Mapper Generation in SpringBoot
0
2199
2
This article mybatis-spring-bootdiscusses the registration and loading...
Ways of Current Limiting-Introduction and Comparison of Several Current Limiting Algorithms
0
2273
2
BrieflyJava current limit can be roughly divided into three aspects.le...
.NET5.0 MVC uses Redis (based on CSRedis)
0
2215
2
InstallInstall Redis serverWindows install Redis5.0Project introduces ...
Mybatis configuration parsing (core configuration file)
0
2283
2
4. Configuration Analysis4.1, the core configuration fileMybatis confi...
What is continuous integration? How to do continuous integration based on Jenkins?
0
2295
2
What is continuous integration? How to associate Jenkins for continuou...
Why use NoSQL
0
2213
2
Introduction NoSQL = Not Only SQL (not only SQL), also explained as no...
CentOS installs php extension swoole and uses case study (applicable to php7)
0
2675
2
Introduction First of all, centOS has installed the php environment, a...
The method of converting the queried value null to 0 in MySQL
0
2225
2
1. IFNULL() methodGenerally, when we use the ifnull() method, we are s...
Analysis of the problem of installing an error on RH5 on RH5
0
2078
0
Customers require mysql-5.1.32 is the gbk versionI downloaded the bina...
MySQL data directory structure
0
2422
0
Conceptually, most relational database systems are similar: they consi...
Optimization of Query Performance - Slow Basics: Optimize Data Access
0
2062
0
A query does not perform very well, mostly due to the large amount of ...
Mysql Advanced Features - Transaction Processing
0
2038
0
To use transaction processing in MySQL, you first need to create a tab...
MySQL service unable to start 1067 error resolution
0
2042
0
Regardless of the version of mysql installed, start mysql will report ...
MySQL opens universal query and slow query
0
2036
0
Open the general query log: record all query logs.The log path default...
MySQL master-slave database configuration
0
2032
0
First set up the MySQL master server: Create a user on the master f...
MySQL Access Right System
0
2058
0
1.MySQL username and password * The username used by MySQL for auth...
How to solve the problem that mysql can't start automatically
0
2038
0
One, download the installation file Go to the MySQL official websit...
How to solve the phenomenon of not found in the mysql
0
2064
0
If you encounter "ERROR '...' not found (errno: 23)", "Cannot open fil...
How to choose mysql distribution format
0
2094
0
After choosing the version of MySQL to install, the second decision to...
Use the PHP program to clear the mysql dead connection
0
2062
0
In recent days, there have been many dead connections in the school's ...
Mysql handling disk full
0
2036
0
This article focuses on how MySQL responds to disk full errors (such a...
How to test mysql installation
0
2090
0
Q: How do I test my MySQL installation? Answer: You can test whethe...
PRIDENTS
0
2040
0
In a table with frequent update and insert operations, the test runs w...
MySQL: Use the source distribution version or binary distribution
0
2030
0
After choosing the version of MySQL to install, the second decision to...
MySQL Enterprise Database Introduction
0
2034
0
MySQL is a leader in open source and one of the fastest growing open s...
Fault Diagnosis and Excluding MYSQL Install under Windows
0
2028
0
When you first install and run MySQL, you may encounter errors that pr...
While installing MySQL, choose the installation package
0
2022
0
When installing MySQL on Windows, there are 3 MySQL 5.1 installation p...
MySQL database causes a high CPU to solve
0
2032
0
Server Environment Liunx AS4 + PHP5 + Mysql5 + Apache 2When I use the ...
How to change the default directory location of the mysql database
0
2022
0
MySQL default data file storage directory is/var/lib/mysql.If you want...
Interpretation of mysqldump parameters in mysql
0
2048
0
Utility to dump a database or databases for backup or for transferring...
MySQL database configuration skills
0
2046
0
Starting a remote service with the root user has always been a securit...
Recovery and reset of mysql database password
0
2026
0
How to recover MySQL passwordIf you forget the MySQL root password, yo...
MYSQL database single table breaks through 4G restriction implementation
0
2036
0
Recently, an old Discuz! user's forum appeared with the message "The t...
MySQL client command line application skills
0
2064
0
Graphically oriented MySQL administration tools abound, but none that ...
MySQL client does not support the solution to the identification protocol
0
2040
0
MySQL 5.1 uses an authentication protocol based on a password hashing ...
Mysql management little experience
0
2002
0
MySql database is the first choice for the backend database of small a...
MySQLinNodb performance adjustment prompt
0
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