Course Elementary  14112

Course Introduction：PHP string functions belong to the core part of PHP. No installation is required to use these functions. "PHP Function String String Function Video Explanation" explains the syntax, parameters, return values, etc. of PHP string functions, and runs examples of various string functions in the browser through the PHP editor to help PHP learners learn more Good to learn and use string functions.

Course Intermediate  4700

Course Introduction：There are two main purposes for studying this course: 1. Visual panel layout adapts to the screen 2. Use ECharts to realize histogram display Core Technology: -Based on flexible.js + rem smart large screen adaptation - VScode cssrem plug-in - Flex layout - Less to use - Based on ECharts data visualization display - ECharts histogram data settings - ECharts map introduction

Course Elementary  2144

Course Introduction：Python visualization video series using matplotlib, seaborn, pyecharts, combined with real data sets; this video is reproduced from Bilibili: BV1gz411v7F5

Course Elementary  20984

Course Introduction：Use PDO mode (PHP data object) to connect and select databases (unified operation of various databases), execute SQL statements and process result sets

Course Intermediate  8359

Course Introduction：Many programmers who have worked for many years still have a very basic understanding of databases. They are confused as soon as they go out for interviews. They don’t understand basic SQL statements, more complex SQL queries, and SQL statement optimization. They don’t even know how to use them. Redis improves system performance and can withstand tens of millions of concurrencies. This set of courses will help you thoroughly understand MySQL locks, execution plans, indexes, MVCC & Redis transactions, cache, breakdown, penetration, avalanche, warm-up, etc., and you can complete all database interviews in one set!

Course Introduction：Oracle database is a very popular relational database management system with rich data types, including numeric types, character types, date types, Blob types, etc. In practical applications, we often encounter the need to convert a character type data into a numeric type. This article will introduce how to convert character data into numeric data in Oracle database. Oracle database supports several number types, including integer (INT), floating point (FLOAT), double precision (DOUBLE), etc.

2023-04-17 comment 0  5456

Course Introduction：In PHP programming, it is often necessary to convert a set of data into a string array. String arrays are very common in PHP and are often used to store specific data types, such as usernames, passwords, email addresses, etc. The process of converting data into a string array is relatively simple and can be completed through the following steps. 1. Create an empty string array to store data. For example, we want to convert the following data into a string array: $data = array('apple', 'banana', 'orange', 'gr

2023-04-27 comment 0  660

Course Introduction：Detailed explanation of how to modify the character set of Oracle database Oracle database is a powerful relational database management system that supports multiple character sets, including Simplified Chinese character set, Traditional Chinese character set, English character set, etc. In practical applications, you may encounter situations where you need to modify the database character set. This article will introduce in detail the method of modifying the Oracle database character set and provide specific code examples for readers' reference. 1. Check the current database character set. Before modifying the database character set, you first need to check the current database character set.

2024-03-02 comment 0  1324

Course Introduction：PHP data filtering: effectively handle special characters in the database. When processing database operations, we often encounter some special characters or strings. These characters or strings may cause SQL statement execution to fail or the database to be injected into the attack. In order to ensure the security and reliability of data, we need to filter and process these special characters. In PHP, we can use some built-in functions or custom functions to handle these special characters. Next, I'll introduce some commonly used methods and code examples. addslas

2023-08-01 comment 0  1628

Course Introduction：When creating a database, the choice of character set is crucial and affects data storage and processing. Here are the steps: Determine the data type (text, number, date, special characters). Select the character set based on the data type (e.g. UTF-8, GBK, Big5, Latin1). Consider database usage (e.g. choose UTF-8 for internationalization). Check applications and tools for compatibility. Evaluate the performance characteristics of character sets for optimization. Recommendation: Choose UTF-8 in most cases, GBK or Big5 for Chinese data, and Latin1 for Western European users.

2024-04-23 comment 0  598