Codeigniter，mysql，select_max并在插入另一条记录之前加1 [英] Codeigniter, mysql, select_max and add 1 before inserting another record

问题描述

将新记录插入数据库表时，我需要获取一个名为el_order的列的现有先前值，添加+1，然后使用该新的el_order + 1将具有该值的新记录插入该列中

When I insert a new record into a database table, I need to take an existing previous value of a column called el_order, add +1, and use that new el_order+1 to insert the new record with that value in the column.

我的英语不好，所以我会这样解释:

My english isn't good, so I will explain like this:

表

   ID      name    el_order
   1         1         1
   21       bla        2
   2        2          3
--NEW--   --NEW--     3+1 (NEW)

我添加了一条新记录，并需要在el_order列中以3 + 1插入它...

I add a new record, and need to insert it with 3+1 in it's el_order column...

我已经尝试过了，但是没有运气:

I have tried this, but no luck:

$this->db->select_max('el_order');
$res = $this->db->get('elem_diccio');

$eldi_key = url_title($this->input->post('id'), 'underscore', TRUE);

$el_order = $res+1;

$datos = array(
    'ID' => $id,
    'el_order' => $el_order,
     'name' => $this->input->post('name'),
 );

 $this->db->insert('elem_diccio', $datos);

谢谢.

推荐答案

就像这样

 $this->db->select_max('el_order');
 $res = $this->db->get('elem_diccio')->row()->el_order;

 $eldi_key = url_title($this->input->post('id'), 'underscore', TRUE);

 $el_order = $res+1;

$datos = array(
  'ID' => $id,
  'el_order' => $el_order,
  'name' => $this->input->post('name'),
);

$this->db->insert('elem_diccio', $datos);

这篇关于Codeigniter，mysql，select_max并在插入另一条记录之前加1的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！