在开发中，我们有时候会遇到在同一程序中链接多个数据库的需求，这对Codeigniter框架来说是很简单的，我们只需要在 database.php文件中配置少许参数即可。
默认情况下，CI配置的是链接一个数据库，代码如下：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | $db['default']['hostname'] = "localhost"; $db['default']['username'] = "root"; $db['default']['password'] = ""; $db['default']['database'] = "first_database_name"; $db['default']['dbdriver'] = "mysql"; $db['default']['dbprefix'] = ""; $db['default']['pconnect'] = TRUE; $db['default']['db_debug'] = FALSE; $db['default']['cache_on'] = FALSE; $db['default']['cachedir'] = ""; $db['default']['char_set'] = "utf8"; $db['default']['dbcollat'] = "utf8_general_ci"; $db['default']['swap_pre'] = ""; $db['default']['autoinit'] = TRUE; $db['default']['stricton'] = FALSE; |
如果我们需要链接另一个数据库时，只需增加如下代码：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | $db['database_two']['hostname'] = "localhost"; $db['database_two']['username'] = "root"; $db['database_two']['password'] = ""; $db['database_two']['database'] = "secound_database_name"; $db['database_two']['dbdriver'] = "mysql"; $db['database_two']['dbprefix'] = ""; $db['database_two']['pconnect'] = TRUE; $db['database_two']['db_debug'] = FALSE; $db['database_two']['cache_on'] = FALSE; $db['database_two']['cachedir'] = ""; $db['database_two']['char_set'] = "utf8"; $db['database_two']['dbcollat'] = "utf8_general_ci"; $db['database_two']['swap_pre'] = ""; $db['database_two']['autoinit'] = TRUE; $db['database_two']['stricton'] = FALSE; |
链接创建完成之后，在应用程序中我们就可以使用第二个数据库了，使用方法如下：
1 2 3 | $secound_db= $this->load->database('database_two', TRUE); $query = $secound_db->get('person'); var_dump($query); |
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这个作者貌似有点懒，什么都没有留下。