Course Introduction：After installing the psycopg2-binary library, use database connection parameters (such as host, database name, user name, password and port) to establish a connection to PostgreSQL through psycopg2.connect(); 2. Create a cursor object to execute SQL queries, such as obtaining the database version or extracting data from a table; 3. Use finally blocks to ensure that the cursor and connection are closed correctly; 4. Optionally use connection strings or environment variables to improve security and flexibility; 5. It is recommended to use a connection pool to manage connections in a production environment. The complete connection and query process has been successfully implemented and closed securely.
2025-07-29 comment 0 973
Course Introduction：Error Connecting to MySQL Server via Unix SocketWhen trying to establish a connection to a MySQL database through the PHP MySQLi class, an error...
2024-12-31 comment 0 297
Course Introduction：When doing big data analysis, I encountered a common but difficult problem: how to interact with the ClickHouse database efficiently. Traditional database connection and query methods cannot meet the needs of high concurrency and large data volumes, resulting in slow response and even crashes of the program. After some exploration, I found the powerful PHP library of smi2/phpclickhouse, which greatly improved my data processing efficiency.
2025-04-17 comment 0 1044
Course Introduction：Update the system and install basic dependencies; 2. Install and configure MariaDB and create Zabbix dedicated database and users; 3. Install Apache and PHP and adjust PHP configuration to meet Zabbix requirements; 4. Add Zabbix official repository and refresh the cache; 5. Install Zabbix server, web front-end, Agent and related components; 6. Import the initial architecture of Zabbix database; 7. Configure the Zabbix server database connection parameters; 8. Configure the Zabbix front-end time zone and restart Apache; 9. Start and enable Zabbix service; 10. Access the web interface through the browser to complete the installation wizard and use the default credentials to log in; 11. Optional configuration firewall open
2025-08-25 comment 0 542
Course Introduction：To use phpMyAdmin to migrate the database, first export the original database and import it to the target server, and finally update the application configuration. 1. Select the "Custom" mode when exporting, check the options "Add DROP", "Add CREATEDATABASE", "Including backticks" and other options to ensure that the complete SQL script is generated; 2. After the target server creates a database of the same name, upload the SQL file through the "Import" function. If the file is too large, adjust the PHP upload restrictions or use the compressed format; 3. Update the database name, user name, password and host information in the application configuration file, and modify the absolute path such as WordPress siteurl and home; 4. Check the table data integrity, user permissions and test the application connection
2025-08-12 comment 0 961
Course Elementary 13880
Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.
Course Elementary 82435
Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).
Course Elementary 13229
Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.
Course Elementary 24687
Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.
Course Elementary 27532
Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.
2019-08-01 20:48:35 1 7 1848
PDO's automatic submission function is enabled on MySQL with autocommit turned off
2023-08-08 15:23:46 0 1 637
The test database operation class db statically calls the getInstance method.
2022-08-18 17:23:59 0 1 959
After cross-class call, method cannot be found
2021-06-12 17:16:18 1 2 1224
Laravel Modal does not return data
2024-03-29 10:31:31 0 1 657
