I have the following function in my model:
function getLocations($limit = null, $offset = null){
$this->db->select('*');
$this->db->from('location');
$this->db->join('process', 'process.process_id=location.process_id');
$this->db->join('line', 'line.line_id=process.line_id');
$this->db->limit($limit, $offset);
$this->db->order_by('location_id', 'asc');
return $this->db->get()->result();
}
It is then executed using: $this->the_model->getLocations()
resulting in the following query:
SELECT *
FROM "location"
JOIN "process" ON "process"."process_id"="location"."process_id"
JOIN "line" ON "line"."line_id"="process"."line_id"
ORDER BY "location_id" asc LIMIT 0
Notice LIMIT 0
, this does not happen when I execute $this->db->order_by('item_id', 'asc')->get('item', $limit, $offset)->result()
. There is no LIMIT 0
even limit and offset is null
. So, how to solve this? I already add if
condition when limit is null.
0
is a value. This does not mean 0
is NULL
. While NULL
has no value at all.
For your case,
function getLocations($limit = 1, $offset = 0){
^ ^
$this->db->select('*');
$this->db->from('location');
$this->db->join('process', 'process.process_id=location.process_id');
$this->db->join('line', 'line.line_id=process.line_id');
$this->db->limit($limit, $offset);
$this->db->order_by('location_id', 'asc');
return $this->db->get()->result();
}
Put the limit
at least 1
and offset to be 0
for default values.
Try this
function getLocations($limit , $offset){
$query = $this->db->query(
"SELECT *
FROM location
JOIN process ON process.process_id=location.process_id
JOIN line ON line.line_id=process.line_id
ORDER BY location_id asc LIMIT $limit, $offset");
$result = $query->result_array();
return $result;
}
Don't set $limit = NULL
. this will fix the issue
thanks for those who response to my question.
I solved this by adjusting the code to:
function getLocations($limit = null, $offset = null){
$this->db->select('*');
$this->db->join('process', 'process.process_id=location.process_id');
$this->db->join('line', 'line.line_id=process.line_id');
$this->db->order_by('location_id', 'asc');
return $this->db->get('location', $limit, $offset)->result();
}
this way there is no LIMIT 0
in generated query even $limit
is null
.
thanks a lot.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.