php - How to use dbforge[of codeigniter] to add foreign key -

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i using codeigniter , trying convert following query dbforge style query, how can it?

create table filter (     filterid int primary key auto_increment,     filtername varchar(50) not null,     categoryid int not null,     isactive tinyint not null,     sequence int not null,     foreign key(categoryid) references category(id));

use $this->db->query(); instead.

this works me....

$sql="create table filter ( filterid int primary key auto_increment, filtername varchar(50) not null, categoryid int not null, isactive tinyint not null, sequence int not null, foreign key(categoryid) references category(id))";  $this->db->query($sql);

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