codeigniter and mysql update error? - php

Question

when i try to update a table i get an error that time.
there is my controller code.
$this->hr_user->insert_user($info);
$n=explode('--', $info['user_code']);
$temp=$n[1];
$lnum=ltrim($temp,'0');
//print_r($lnum);
//echo "<br>lastnumber".$lnum;
$id=$info['user_type'];
echo $id.''.$lnum;
$this->hr_user->update_number($id,$lnum);
redirect('hrm/index');
and here is my model code.
public function update_number($id,$lnum)
{
$this->db->where('em_id',$id);
$this->db->update('tbl_emaster.em_lastnumber',$lnum);
}

Answer 1

$this->db->set('field', 'field+1');
$this->db->where('id', 2);
$this->db->update('mytable');
// gives UPDATE `mytable` SET `field` = ' field+1' WHERE `id` = 2
https://www.codeigniter.com/userguide3/database/query_builder.html#updating-data

Answer 2

The mysql error you got explains every thing. Your query order doesn't generate a qualified query, try:
public function update_number($id,$lnum)
{
$this->db->set('eenter code herem_lastnumber', '$lnum');
$this->db->where('em_id',$id);
$this->db->update('emaster');
}
for more info www.codeigniter.com

Answer 3

Mysql update query syntax is :
UPDATE table_name SET field1 = new-value1, field2 = new-value2
[WHERE Clause]
You can see, there are fields after SET.
And because of your CI update syntax, column name is not being passed. And to pass that, you should pass array as 2nd argument of $this->db->update('tbl_emaster.em_lastnumber',$lnum);
So you need to change it like this:
$this->db->update('tbl_emaster',array('em_lastnumber' => $lnum);

Answer 4

change query
public function update_number($id,$lnum)
{
$data=array('em_lastnumber'=>$lnum);
$this->db->where('em_id',$id);
$this->db->update('tbl_emaster',$data);
}