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 0 979
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：This article aims to provide Go language developers with a detailed SQLite3 database integration tutorial. We will focus on how to use the go-sqlite3 library to perform basic operations such as database connection, table creation, data insertion and query, and provide complete sample code and best practices to help readers manage SQLite3 data efficiently in Go projects.
2025-09-07 comment 0 442
Course Introduction：This article aims to provide Go language developers with a complete guide to SQLite3 database integration. We will focus on how to use the popular github.com/mattn/go-sqlite3 library to cover its core operations such as installation, database connection, table creation, data insertion, query, update and deletion, and provide practical code examples and precautions to help you efficiently implement SQLite3 data persistence in your Go applications.
2025-08-29 comment 0 770
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 1059
Course Elementary 13924
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 82479
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 13263
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 24727
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 27562
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 1852
PDO's automatic submission function is enabled on MySQL with autocommit turned off
2023-08-08 15:23:46 0 1 639
The test database operation class db statically calls the getInstance method.
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After cross-class call, method cannot be found
2021-06-12 17:16:18 1 2 1227
Laravel Modal does not return data
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