Using master-master mysql db replication in Yii -

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i have 2 servers have setup mysql master-master db replication balance db load.

'db'=>array(         'connectionstring' => 'mysql:host=localhost;dbname=mydb',         'emulateprepare' => true,         'username' => 'root',         'password' => 'rootpass',         'charset' => 'utf8',     ),

the question have is, mysql determine when use master db ? if not, have connect both of master dbs (how use in application)?

can point me in right direction ? thanks.


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