Course 2857
Course Introduction:Course introduction: 1. Cross-domain processing, token management, route interception; 2. Real interface debugging, API layer encapsulation; 3. Secondary encapsulation of Echarts and paging components; 4. Vue packaging optimization and answers to common problems.
Course 1795
Course Introduction:Apipost is an API R&D collaboration platform that integrates API design, API debugging, API documentation, and automated testing. It supports grpc, http, websocket, socketio, and socketjs type interface debugging, and supports privatized deployment. Before formally learning ApiPost, you must understand some related concepts, development models, and professional terminology. Apipost official website: https://www.apipost.cn
Course 5521
Course Introduction:(Consult WeChat: phpcn01) The comprehensive practical course aims to consolidate the learning results of the first two stages, achieve flexible application of front-end and PHP core knowledge points, complete your own projects through practical training, and provide guidance on online implementation. Comprehensive practical key practical courses include: social e-commerce system backend development, product management, payment/order management, customer management, distribution/coupon system design, the entire WeChat/Alipay payment process, Alibaba Cloud/Pagoda operation and maintenance, and project online operation. .....
Course 5172
Course Introduction:(Consult WeChat: phpcn01) Starting from scratch, you can solve conventional business logic, operate MySQL with PHP to add, delete, modify, and query, display dynamic website data, master the MVC framework, master the basics of the ThinkPHP6 framework, and learn and flexibly master all knowledge involved in PHP development. point.
Course 8713
Course Introduction:(Consult WeChat: phpcn01) The learning objectives of the front-end development part of the 22nd issue of PHP Chinese website: 1. HTML5/CSS3; 2. JavaScript/ES6; 3. Node basics; 4. Vue3 basics and advanced; 5. Mobile mall/ Website background homepage layout; 6. Automatic calculation of tabs/carousels/shopping carts...
TypeError: Cannot read property of null (read 'length'). What does it mean?
2023-11-04 11:52:35 0 2 255
Align decimal points of numbers in table with pseudo "center" alignment appearing in cells
2023-10-24 13:01:47 0 1 266
将Including array as a dependency in useEffect
2023-10-17 18:50:23 0 2 207
There is a problem when the getFirstHalf function returns the result
2023-09-22 08:49:09 0 1 417
Using one property in the interface as the array length of another property in the same interface
2023-09-16 23:36:08 0 1 231
Course Introduction:The default length of the VARCHAR data type in SQL varies by DBMS, typically: MySQL: 255 characters PostgreSQL: 255 characters Microsoft SQL Server: 1 character (must be specified explicitly) Oracle: 2000 characters (if no length is specified) Factors that affect the default length include DBMS version, column constraints, and database design. You can determine the default VARCHAR length for a specific database by querying the information_schema.columns table. The best practice is to choose the appropriate VARCHAR length based on actual data needs to avoid excessive or inappropriate
2024-05-02 comment 0 592
Course Introduction:Varchar in MySQL can store up to 65535 bytes of data. The maximum length of varchar is limited by the maximum row length. 65535 is not a very precise upper limit, and this upper limit can be continued to be reduced. 65535 bytes include 65535 bytes including the length of all fields, length identification of variable length fields, etc.
2020-06-18 comment 0 12875
Course Introduction:No, the VARCHAR data type in MySQL must specify a length to define its maximum number of characters. If the length is not specified, MySQL will throw an error.
2024-04-29 comment 0 833
Course Introduction:The maximum length of a VARCHAR in Oracle depends on the Oracle version and database character set: 4000 bytes for Oracle 11g and earlier, 32767 bytes for Oracle 12c and later. The maximum length is 4000 characters for single-byte character sets (such as ASCII) and 2000 characters for multi-byte character sets (such as UTF-8).
2024-05-08 comment 0 497
Course Introduction:In fact, the VARCHAR data type stores variable-length character data in single-byte and multi-byte characters. The syntax for this data type is VARCHAR(n), where n is the maximum number of characters that must be specified when creating the table. Prior to MySQL 5.03, the value of n could range from 0 to 255, but in MySQL 5.03 and later, the value could range from 0 to 65,535. The maximum number of characters stored in VARCHAR depends on the maximum row size and the character set used. If we use ASCII character set then it can store 65,535 characters as ASCII uses 1 byte per character. On the other hand, if we use utf8 character set, the character limit will be 21,844, so
2023-08-24 comment 0 656