我的CI不能正确运行查询

I've set my unicode settings correct in codeigniter.

I want to run the query :

SELECT * FROM (restaurants) WHERE restaurant_name LIKE 'دالون'

but codeigniter runs :

SELECT * FROM (restaurants) WHERE restaurant_name LIKE '%\%D8\%AF\%D8\%A7\%D9\%84\%D9\%88\%D9\%86%'

and no results are returned?

I need help...

SET CHARACTER SET utf8

for example in mysqli functions

$MySQL_Handle = mysqli_connect(HOSTNAME,DATABASE_USERNAME,DATABASE_PASSWORD,DATABASE_NAME) 
or die ( mysqli_error($MySQL_Handle) ); 

$sSQL= 'SET CHARACTER SET utf8'; 

mysqli_query($MySQL_Handle,$sSQL) 
or die ('Can\'t charset in DataBase'); 

this action need before insert and before select.