Using the database abstraction layer means that there is almost no need to change too much program code when migrating from one database system to another, such as migrating MS SQL Server to MySQL. First of all, the code planning must be standardized, that is, the entire system uses the same data object instance and the same good database abstraction layer. If one day the user requires switching Oracle to MySQL, all he needs to do is change the system configuration file. In today's industrial field, each database developer such as Microsoft, Oracle, and MySQL has its own set of SQL standards. They claim to add their own features in accordance with the ANSI SQL92 standard in order to monopolize or occupy the market. The excellent database abstraction layer will automatically adjust some SQL performance based on the database we are currently using. When you are not using specific features of the database itself, you don't have to change too many database connections and database SQL queries.
Other benefits of using a database abstraction layer are that its nature and concepts simplify complex tasks. Therefore, we do not have to learn completely new features of a database system, but only use the code features of a standard abstraction layer.
<?php
use Bernard\Message\PlainMessage;
class EchoTimeService
{
public function echoTime(PlainMessage $message)
{
if (rand(0, 10) == 7) {
throw new \RuntimeException('I failed because rand was 7');
}
usleep(100);
}
} 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
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