[英]Can CodeIgniter Helper Functions use database functions?
One of my CodeIgniter Controller functions needs to call a recursive function as part of its functionality. 我的CodeIgniter控制器函数之一需要调用递归函数作为其功能的一部分。 The function call chokes if I put it inside the controller class, and it can't access database functions ($this->db->get())
if I put it outside the class. 如果我将其放在控制器类中,则该函数调用会阻塞,如果将其放在该类之外,则它将无法访问数据库函数($this->db->get())
。 Would making it a helper function fix this problem? 使其成为辅助函数可以解决此问题吗?
You can get instance: 您可以获取实例:
$CI =& get_instance();
After that you will be able to use $CI->db
for queries.. 之后,您将可以使用$CI->db
进行查询。
If you want to use $this in libraries, helpers, and access all the methods: 如果要在库,助手中使用$ this并访问所有方法:
$this->ci =& get_instance();
$this->ci->load->database();
You can do also: 您还可以:
$this->ci->config->item('languages');
or 要么
$this->ci->load->library('session');
We can define a function in helper 我们可以在助手中定义一个函数
if (!function_exists('getRecordOnId'))
{
function getRecordOnId($table, $where){
$CI =& get_instance();
$CI->db->from($table);
$CI->db->where($where);
$query = $CI->db->get();
return $query->row();
}
}
and we can call from view like 我们可以从像
$recordUser = getRecordOnId('users', ['id' => 5]); //here 5 is user Id which we can get from session or URL.
//Select Data:
$this->db->select(‘fieldname seperated by commas’);
$this->db->from(‘table’);
$query = $this->db->get();
$results=$query->result() ;
//Joins:
$this->db->select(‘*’);
$this->db->from(‘table1′);
$this->db->join(‘table2′, ‘table2.id = table1.id’);
$query = $this->db->get();
We may get it from http://skillrow.com/codeignitor-database-functions/ 我们可以从http://skillrow.com/codeignitor-database-functions/获得它
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