如何使用CodeIgniter加載另一個數據庫？

Question

我有一個CodeIgniter和一些Mysql數據庫。但知道我想設置另一個數據庫的工作，並在一些行動後禁用它。例如，我有功能make_some_actions_with_db（），現在我需要有類似的東西：

public function action() 
{ 
//load db 
make_some_actions_with_db(); 
//disable db 
} 

所以，現在我需要知道如何設置新的默認數據庫，我怎麼可以設置其他（第一） D b。謝謝。

更新： 它不工作：

public function update_record_insert_test() 
    { 
     if ($this->facebook->getUser()) 
     { 
      $another_db_settings['hostname'] = 'localhost'; 
      $another_db_settings['username'] = 'root'; 
      $another_db_settings['password'] = ''; 
      $another_db_settings['database'] = 'name'; 
      $another_db_settings['dbdriver'] = "mysql"; 
      $another_db_settings['dbprefix'] = ""; 
      $another_db_settings['pconnect'] = TRUE; 
      $another_db_settings['db_debug'] = TRUE; 
      $another_db_settings['cache_on'] = FALSE; 
      $another_db_settings['cachedir'] = ""; 
      $another_db_settings['char_set'] = "utf8"; 
      $another_db_settings['dbcollat'] = "utf8_general_ci"; 
      $this->load->database($another_db_settings); 

      $_POST['id']='AccountPagesView.a_book/1000'; 
      $_POST['value']='test'; 
      $_POST['old_value']='not'; 
      $welcome=new Welcome(); 
      $welcome->update_record(); 
     } 
     else 
     { 
      $url=$this->facebook->getLoginUrl(array('next' => base_url().'update_record_insert_test')); 
      redirect($url); 
     } 
    } 

Answer 1

在你config/database.php您的數據庫配置爲 '默認' 組，就像這樣：

$db['default']['hostname'] = 'host'; 
$db['default']['username'] = 'username'; 
$db['default']['password'] = 'password'; 
$db['default']['database'] = 'database'; 

這可以讓你指定其他組如此：

$db['second']['hostname'] = 'host'; 
$db['second']['username'] = 'username'; 
$db['second']['password'] = 'password'; 
$db['second']['database'] = 'database'; 

$db['third']['hostname'] = 'host'; 
$db['third']['username'] = 'username'; 
$db['third']['password'] = 'password'; 
$db['third']['database'] = 'database'; 

然後，您可以通過使用連接到另一個數據庫：

$defaultDB = $this->load->database('default', TRUE); 
$secondDB = $this->load->database('second', TRUE); 

通過傳遞true作爲第二值，它會返回數據庫對象，讓您安全地使用同樣的方法對每個數據庫，就像這樣：

$default->get('table'); 
$second->get('different_table'); 

Answer 2

如果要更改默認的數據庫連接（我不推薦），你可以這樣做：

$another_db_settings['hostname'] = ''; 
$another_db_settings['username'] = ''; 
$another_db_settings['password'] = ''; 
$another_db_settings['database'] = ''; 
$another_db_settings['dbdriver'] = "mysql"; 
$another_db_settings['dbprefix'] = ""; 
$another_db_settings['pconnect'] = TRUE; 
$another_db_settings['db_debug'] = TRUE; 
$another_db_settings['cache_on'] = FALSE; 
$another_db_settings['cachedir'] = ""; 
$another_db_settings['char_set'] = "utf8"; 
$another_db_settings['dbcollat'] = "utf8_general_ci"; 
$this->load->database($another_db_settings); 

然後將新的數據庫可以通過這個 - $>數據庫訪問，但我會建議做什麼建議和cchana通過分配

$new_db = $this->load->database($another_db_settings, TRUE);