Codeigniter / PHP检查是否可以连接到数据库

本文介绍了Codeigniter / PHP检查是否可以连接到数据库的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 29岁程序员，3月因学历无情被辞！ 我想用我的主数据库备份我的只读副本（即从属）数据库，但这个简单的布尔我失败了：I'd like to backup my read replica(i.e., slave) database with my master database but this simple boolean I did failed:$config['hostname'] = "myReadReplicaDatabase.com";//...$config['other_stuff']; other config stuff...$db_obj=$CI->load->database($config, TRUE);if(!$db_obj){ $config['hostname'] = "myMasterDatabase.com"; $db_obj=$CI->load->database($config, TRUE);} 在终止我的只读副本数据库后，我期望布尔值计算 FALSE 和脚本，然后使用我的主数据库。不幸的是，我得到以下PHP错误：After terminating my read replica database I expected the boolean to evaluate to FALSE and the script to then use my master database. Unfortunately, instead I got the following PHP error:Unable to connect to your database server using the provided settings.Filename: core/Loader.php 所有我想要的是连接返回trueAll i want is for the connection to return true or false, does anyone know how to do this in Codeigniter?推荐答案我的问题回答了在Codeigniter论坛上的这个线程。关键是不自动初始化数据库：The key is to not autoinitialize the database:$db['xxx']['autoinit'] = FALSE;为了抑制错误，您可以设置To suppress errors it you can set this$db['xxx']['db_debug'] = FALSE; $ bThen in your code that checks the db state, check TRUE/FALSE of the initialize() function:$db_obj = $this->database->load('xxx',TRUE); $connected = $db_obj->initialize(); if (!$connected) { $db_obj = $this->database->load('yyy',TRUE);}这是我的整个配置文件供将来参考： https://gist.github.com/3749863 。Here is my entire config file for future reference: https://gist.github.com/3749863. 这篇关于Codeigniter / PHP检查是否可以连接到数据库的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！