Codeigniter 3: Is there any 'where' condition added to the Query Builder so far?

I'm using CodeIgniter 3. I just need to know if there is a 'where' condition added to the query builder until now.

I'm calling a 'delete' function that deleted rows from database And it's possible to add a where condition before calling that function. Something like this:

public function delete()
{
    // Here I need to know if where condition added to the db class

    $this->db
        ->where('field', 1)
        ->delete('my_table');
}

public function main()
{
    $this->db->where('field2', 2);
    $this->delete();
} 

I found a solution. The only thing I need to do is getting a select query and search for 'where' clause inside it:

public function delete()
{
    // Here I need to know if where condition added to the db class

    $sql = $this->db->get_compiled_select(NULL, FALSE);
    $has_where = stripos($sql, 'where') !== FALSE;

    // $has_where is TRUE if there is a where condition defined until now

    $this->db
        ->where('field', 1)
        ->delete('my_table');
}

public function main()
{
    $this->db->where('field2', 2);
    $this->delete();
}