PHP CI框架学习笔记-分页实现程序

视图html

<div id="body">
<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>

控制器

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' );
}
}　

因为config.php中默认的enable_query_strings是false, 起始位置始终在最后，这样出来的结果类似/index.php/search/index/?s=中国/10,页码取不到，需要将此配置改为false;

数据加载模型

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;
}