How to use DbMessageSource in yii2

Use DbMessageSource translate and automatic save missingtransalte into db in yii2.

I have code short config :

    'i18n' => [


		'translations' => [


			'*' => [


				'class' => 'yii\i18n\ExDbMessageSource',


				'forceTranslation' => true,


				'enableCaching'   => true,


				'cachingDuration' => 3600,


				'on missingTranslation' => ['common\components\ExDbMessageSource', 'handleMissingTranslation']


		    ]


	    ],


    ],

Please help me.