我有两张桌子:
table1:id,user_id,poll_id,options_id
table2:id,poll_id,votes
列投票是一个整数,我想通过将表与一些where子句连接来更改值:
$this->db
->set('votes', 'votes - 1', FALSE)
->join('table1', 'poll_votes.options_id = table2.id')
->where('poll_id', $row)
->where('user_id', $id)
->update('table2');
我收到此错误:
Error Number: 1054 Unknown column 'user_id' in 'where clause' UPDATE `table2` SET votes = votes - 1 WHERE `poll_id` = '9' AND `user_id` = '1'
答案 0 :(得分:9)
试试这个:
$this->db->set('votes', 'votes - 1', FALSE)
$this->db->where('table1.user_id',$id);
$this->db->where('table2.poll_id',$row);
$this->db->update('table1 join table2 ON table1.poll_id= table2.poll_id');
答案 1 :(得分:0)
试一试。它对我有用!!!
$data = array(
'a.ED_FName' => $_POST['firstname'],
'a.ED_MName' => $_POST['middlename'],
'a.ED_LName' => $_POST['lastname'],
'a.ED_Location' => $_POST['location'],
'a.ED_Company' => $_POST['company'],
'b.EMD_Department' => $_POST['department']
);
$this->db->set($data);
$this->db->where('a.EmpID', $empID);
$this->db->where('b.EmpID', $empID);
$this->db->update('tbl_employeedetails as a, tbl_employeementdetails as b');
最诚挚的问候, TUSHAR NIRAS
<强>更新强>
注意: 永远不要使用像$ _POST这样的全局数组,$ _GET直接包含用户的请求数据而不进行安全检查。这可能导致严重的问题,如SQL注入。