Programmer Think

Summary You can use the rule engine to forward IOT platform data to a message queue (RocketMQ) for storage.This enables the full-link, highly reliable transmission of messages from devices, Internet of Things platforms, RocketMQ to application servers.Starting with the creation of products and devices on the Internet of Things platform, the tex ...

If you need to check the sql usage of a system, you can query the $sql, $sssession, $sqlarea of Oracle for statistical troubleshooting Check the basic information of $sql and $session before troubleshooting select * from v$sql a, v$session b where b.SQL_ADDRESS = a.ADDRESS and b.SQL_HASH_VALUE = a.HASH_VALUE and b.SQL ...

TCP is a protocol based on streaming. Request data is not bounded in its transmission, so when we read a request, we may not get a complete packet.If a packet is large, it may be sliced into multiple packets for multiple transmissions.At the same time, if there are multiple small packages, they may be integrated into one large package for tran ...

Set up FTP service One: install ftp service 1.1 mount image file Install vsftpd package 1.2 yum warehouse can also be used [root@localhost ~]# yum install vsftpd-sysvinit.x86_64 -y Installed: vsftpd-sysvinit.x86_64 0:3.0.2-25.el7 Complete! 1.3 related file path [root@localhost ~]# cd /etc/vsftpd/ [root@lo ...

Knowledge of OAuth2.0 Learn more about OAuth 2.0 in Salesforce (SF official) A simple explanation of OAuth 2.0 (Ruan Yifeng) Four ways of OAuth 2.0 GitHub OAuth third party login example tutorial (Ruan Yifeng) Create application New application Access samples (Python+django) Environmental preparation: index.html There are t ...

By using FlaskForm, the form processing can be realized conveniently and quickly. Explain Operating system: Windows 10 Python version: 3.7x Virtual Environment Manager: virtualenv Code editor: VS Code Experimental target Through the use of flask? WTF form related operations, and complete the new user registration. install pip install flask ...

Use of sessionStorge The sessionStorage property allows you to access a session Storage object. It is similar to localStorage, except that the data stored in localStorage has no expiration time setting, and the data stored in sessionStorage will be cleared at the end of the page session. The page session is maintained while the browser is open, ...

Today, I present the development of login and registration interface, which is based on token verification. Let's talk less and get to the point! First look at the database model: #pip install passlib from passlib.apps import custom_app_context as pwd_context class Shop_list(db.Model): __tablename__ = 'shop_list' userName = db.Column(db ...

Summary Two pages in totalWhen accessing the product list directly, it will judge whether the user is logged in. If the user is not logged in, it will jump for 3 secondsIf the user logs in, there is no jumpLogin page: for login page, enter user name and password directly. Compare with database to loginAnd save the password locally ps usually ne ...

python chain home asynchronous IO crawler, using asyncio, aiohttp and aiomysql Many small partners will learn about crawlers when they start to learn python. When they start to learn python, they will use requests and urlib synchronous libraries for single thread crawlers, which is slow. Later, they will use the scratch framework for crawlers, ...