<div >
   <form action="/index.php/search/index/" method="get">
       <p>请输入书名、作者、出版社中的一个或多个来查询。</p>
       <p><input type="text" name="s" value="" size="64" /> <input type="submit" value="搜索" /></p>
   </form>
</div>

public function index() {
    $keyword = $this->input->get ( 's' );
    $offset = $this->input->get ( 'offset' );
    if (empty ( $offset )) {
        $offset = 0;
    }
    if (! empty ( $keyword )) {
        $this->load->model ( 'book_model' );
        $this->load->library ( 'pagination' );
        $per_page = 10;
        $config ['num_links'] = 5;
        $config ['base_url'] = '/index.php/' . $this->router->class . '/' . $this->router->method . '/?s=' . $keyword;
        $config ['per_page'] = $per_page;
        $config ['total_rows'] = $this->Book_Model->find_by_name ( $keyword, NULL, NULL, true );
        $config ['page_query_string'] = false;
        $config ['query_string_segment'] = 'offset'; //重新定义记录起始位置的参数名，默认为per_page
        $this->pagination->initialize ( $config );
        $data ['books'] = $this->Book_Model->find_by_name ( $keyword, $per_page, $offset );
        $this->load->view ( 'search', $data );
    } else {
        $this->load->view ( 'search' );
    }
}　

public function find_by_name($name, $per_page=0, $offset = 0, $is_total = false) {
    if ($is_total) {//总数
$query = $this->db->query ( "select count(id) as cnt from {$this->_book} where book_name like '%{$name}%'" );
if ($query->num_rows () > 0) {
    $row = $query->row ();
    $ret = $row->cnt;
}
   }else{//列表
      $query = $this->db->query ("select * from {$this->_book} where book_name like '%{$name}%' limit {$offset}, {$per_page}");
      $ret = $query->result ();
   }
   return $ret;
}