Course Elementary 9824
Course Introduction:The processing and analysis of strings is an important foundation in any programming language. The classification, parsing, storage and display of information, as well as data transmission in the network, all require the manipulation of strings. It is particularly important in web development. Most of the work of programmers is to operate strings, so string processing also reflects a programming ability of programmers.
Course Elementary 25369
Course Introduction:Object-oriented programming using php
Course Intermediate 5436
Course Introduction:Flutter is Google's mobile UI framework that can quickly build high-quality native user interfaces on iOS and Android. Flutter can work with existing code. Flutter is being used by more and more developers and organizations around the world, and Flutter is completely free and open source. We will unveil his lovely and magical veil here.
Course Elementary 12865
Course Introduction:From the perspective of beginner and intermediate readers, through easy-to-understand language and colorful examples, it introduces in detail the knowledge required to use Android. Using the Android Studio development tool, it explains from an Android application, from the shallower to the deeper, so that students can gradually Master the essence of Android.
Course Elementary 7750
Course Introduction:01-NodeJS (introduction, installation, common modules, message board) 02-NodeJS (NPM usage, template engine, Express framework) 03-NodeJS (Express framework student project, login registration, middleware, session technology, error handling) 04-NodeJS (ES6, web crawler, MySQL, koa2 framework student project)
Processing of SMS return values
2019-10-03 08:25:51 0 1 1025
How to handle missing values using Python
2017-06-22 11:51:31 0 2 832
2023-10-31 20:01:48 0 2 687
How Weex handles HTTPS network requests and how Android handles it
2017-06-17 09:16:08 0 1 852
java - I would like to ask, can a default value be specified when @PathVariable is empty?
2017-05-17 10:06:50 0 2 1176
Course Introduction:How to handle null and missing values in JSON using PHP and MySQL? When using PHP and MySQL to process JSON data, you often encounter the situation of dealing with null values and missing values. This article will describe how to handle these problems using PHP and MySQL, and provide code examples. 1. Handling NULL Values When extracting data from the database and converting it into JSON format, you often encounter situations where the field value is empty. In order to ensure the integrity and accuracy of JSON data, we need to handle these null values. PHP
2023-07-12 comment 0 1119
Course Introduction:How to use MySQL's IFNULL function to deal with the null value problem. In daily database operations, we often encounter the situation of dealing with null values (NULL). MySQL provides many functions to handle null values, among which the IFNULL function is a very commonly used function. This article will introduce how to use the IFNULL function to deal with null value problems in MySQL and provide some usage examples. 1. Basic usage of IFNULL function The IFNULL function is a function used to handle null values in MySQL. it accepts
2023-07-25 comment 0 3723
Course Introduction:Optional class in Java8: How to use the orElse() method to handle possibly null values Introduction: In daily programming, we often encounter values that may be null. To avoid Null Pointer Exceptions, Java 8 introduces a new Optional class, which provides an elegant way to handle potentially null values. This article will focus on the orElse() method of the Optional class and show through code examples how to use this method to handle possibly null values. Optio
2023-07-29 comment 0 1835
Course Introduction:How to use the COALESCE function in MySQL to handle multiple possibly null fields The COALESCE function is a very useful function in MySQL when dealing with multiple possibly null fields. During the development process, we often encounter situations where we need to process multiple fields that may be empty. At this time, the COALESCE function can play its role. The COALESCE function returns the first non-empty value from multiple input values, implementing the function of processing fields that may be empty. This article will introduce how to use COA
2023-07-24 comment 0 753