mysql-动态更改数据库连接Yii

我正在一个项目中,一个Yii安装将运行多个网站.每个网站都有自己的数据库,因此数据库连接必须是动态的.

我做了什么,我创建了一个BeginRequestBehavior,它将在onBeginRequest中启动.在这里,我将检查已调用了哪个url,并确定匹配的数据库(不在我的代码中)并创建(或覆盖)“ db”组件.

<?PHP
class BeginRequestBehavior extends CBehavior
{

    /**
     * Attaches the behavior object to the component.
     * @param CComponent the component that this behavior is to be attached to
     * @return void
     */

    public function attach($owner)
    {

        $owner->attachEventHandler('onBeginRequest', array($this, 'switchDatabase'));

    }

    /**
     * Change database based on current url, each website has his own database.
     * Config component 'db' is overwritten with this value
     * @param $event event that is called
     * @return void
     */

    public function switchDatabase($event)
    {
        // Here some logic to check which url has been called..

        $db = Yii::createComponent(array(
            'class' => 'CDbConnection',
            'connectionString' => 'MysqL:host=localhost;dbname=test',
            'emulatePrepare' => true,
            'username' => 'secret',
            'password' => 'verysecret',
            'charset' => 'utf8',
            'enableProfiling' => true,
            'enableParamLogging' => true
        ));

        Yii::app()->setComponent('db', $db);

    }
}

一切正常,但这是正确的方法吗？在其他方法中,我看到人们为他们的模型创建自己的“ MyActiveRecord”(扩展CActiveRecord)并将db组件置于属性中.他们为什么这样做？恐怕这种方式将数据库连接建立的次数过多.

解决方法:

我使用模型函数定义她的数据库连接：

public static $conection; // Model attribute

public function getDbConnection(){

    if(self::$conection!==null)
        return self::$conection;

    else{
        self::$conection = Yii::app()->db2; // main.PHP - DB config name

        if(self::$conection instanceof CDbConnection){
            self::$conection->setActive(true);
            return self::$conection;
        }
        else
            throw new CDbException(Yii::t('yii',"Active Record requires a '$conection' CDbConnection application component."));
    }
}

main.PHP：

 'db'=>array( 
    'connectionString' => 'MysqL:host=192.168.1.*;dbname=database1',
    'emulatePrepare' => true,
    'username' => 'root',
    'password' => 'password',
    'charset' => 'utf8',
    'enableProfiling'=>true,
    'enableParamLogging' => true,
),
'db2'=>array(
    'class'=>'CDbConnection',
    'connectionString' => 'MysqL:host=192.168.1.*;dbname=database2',
    'emulatePrepare' => true,
    'username' => 'root',
    'password' => 'password',
    'charset' => 'utf8',
),