The singleton mode is introduced to ensure that this class will not be instantiated repeatedly in global calls, reducing the waste of system resources. An object (before learning the design pattern, you need to have a better understanding of the orientation Object thinking) is only responsible for a specific task.
The application of PHP is mainly in database applications, so there will be a large number of database operations in an application. Using the singleton mode can avoid a large number of resources consumed by new operations.
All resources on this site are contributed by netizens or reprinted by major download sites. Please check the integrity of the software yourself! All resources on this site are for learning reference only. Please do not use them for commercial purposes. Otherwise, you will be responsible for all consequences! If there is any infringement, please contact us to delete it. Contact information: admin@php.cn
Related Article
PHP database operation class based on pdo22Jun2018
This article mainly introduces PHP's pdo-based database operation class, which can implement basic database connections, additions, deletions, modifications, and connections, etc. It also supports operations on mysql, sqlserver, oracle and other databases. Friends in need can refer to the following
21Jul2016
A PDO-based database operation class (new) A PDO transaction instance. Copy the code The code is as follows: ?php /* * Author: Hu Rui * Date: 2011/03/19 * Email: hooray0905@foxmail.com * * 20110319 * Common database operations, such as: add, delete, modify, query, and obtain single records
29Jul2016
:This article mainly introduces the database operation base class implemented by PHP based on the singleton mode. Students who are interested in PHP tutorials can refer to it.
29Jul2016
pcskys_windows7loader:pcskys_windows7loader A new PDO transaction instance based on PDO database operation class: copy the code as follows:
PHP database is based on PDO operation class (mysql)13Apr2018
The content shared in this article is based on the PDO operation class (mysql) of the PHP database. Now I share it with you. Friends in need can refer to the content of this article.
29Jul2016
parallels desktop 7:parallels desktop 7 A database operation class based on PDO: Baidu later decided to use PDO. As for why it chose PDO, I won’t say more here. You can understand it yourself by going to Baidu. Since we want to change, we basically need to have a commonly used database operation class, which is the so-called addition, deletion, modification, query, etc. I spent the whole night playing around and roughly came up with a prototype. The following is the code. I hope you can give me some ideas. Opinion. Copy the code The code is as follows:
Hot Tools
Object-oriented php operation mssql class
Object-oriented php operation mssql class
Complete PHP operation MySQL database class
Complete PHP operation MySQL database class