At the moment if I am doing a query on the database that should only return one row, using:
...query stuff...
$query = $this->db->get();
$ret = $query->result();
return $ret[0]->campaign_id;
Is there a CodeIgniter function to return the first row?
something like $query->row();
Or even better would be the ability to, if there was only one row, to just use the query object directly.
e.g. $query->campaign_id;
You've just answered your own question :) You can do something like this:
$query = $this->db->get();
$ret = $query->row();
return $ret->campaign_id;
You can read more about it here: http://www.codeigniter.com/user_guide/database/results.html
$row = json_decode($query->row(), true); ended up using--> $row = $query->result_array()[0];
row() returned null because there were no qualifying rows found by the query. null will never have a property called campaign_id.This is better way as it gives you result in a single line:
$this->db->query("Your query")->row()->campaign_id;
(query)?(getresult) : (null)row() returned null because there were no qualifying rows found by the query. null will never have a property called campaign_id.To add on to what Alisson said you could check to see if a row is returned.
// Query stuff ...
$query = $this->db->get();
if ($query->num_rows() > 0)
{
$row = $query->row();
return $row->campaign_id;
}
return null; // or whatever value you want to return for no rows found
To make the code clear that you are intending to get the first row, CodeIgniter now allows you to use:
if ($query->num_rows() > 0) {
return $query->first_row();
}
To retrieve the first row.
row() returned null because there were no qualifying rows found by the query.If you require to get only one record from database table using codeigniter query then you can do it using row(). we can easily return one row from database in codeigniter.
$data = $this->db->get("items")->row();
row() returns the first row of the result set as a flat object or if there were no rows in the result set the null is returned.Change only in two line and you are getting actually what you want.
$query = $this->db->get();
$ret = $query->row();
return $ret->campaign_id;
try it.
row() returned null because there were no qualifying rows found by the query.You can do like this
$q = $this->db->get()->row();
return $q->campaign_id;
Documentation : http://www.codeigniter.com/user_guide/database/results.html
Option 1 $limit = 1 $offset = 0
$query = $this->db->get_where('items', array('id' => $id), $limit, $offset);
Option 2
$this->db->get("items")->row();
We can get a single using limit in query
$query = $this->db->get_where('mytable', array('id' => $id), $limit, $offset);
The row() method (or row_array()) is the most appropriate call for receiving zero or one record from a query resultset. Your script should accommodate the possibility of a null return value from the method call. Null coalescing is the most elegant way to handle that.
return $this->db
->query($yourSql)
->row()
->campaign_id ?? null;
Equivalent syntax:
return $this->db
->query($yourSql)
->row('campaign_id');
The ability to nominate a column name inside of row() to isolate a specific column value from the first result set row has been available in CodeIgniter for as far back as I could find. If there are no qualifying rows or if the passed-in column name doesn't exist in the query result, then null will be returned.
I verified the above with these versions:
CI2.1.0: https://www.codeigniter.com/userguide2/installation/downloads.html
CI1: https://github.com/kidino/CodeIgniter-1/blob/develop/system/database/DB_result.php
For context, CI3.1.11's row() method signature is as follows. While $n is a poor parameter name, it is designed to work with integers and strings to provide granular data access. If a non-numeric value is provided, then a single value will be returned for the nominated column in the first row. If a numeric value is provided, then the whole row with that index will be returned.
/**
* Row
*
* A wrapper method.
*
* @param mixed $n
* @param string $type 'object' or 'array'
* @return mixed
*/
public function row($n = 0, $type = 'object')
{
if ( ! is_numeric($n))
{
// We cache the row data for subsequent uses
is_array($this->row_data) OR $this->row_data = $this->row_array(0);
// array_key_exists() instead of isset() to allow for NULL values
if (empty($this->row_data) OR ! array_key_exists($n, $this->row_data))
{
return NULL;
}
return $this->row_data[$n];
}
if ($type === 'object') return $this->row_object($n);
elseif ($type === 'array') return $this->row_array($n);
return $this->custom_row_object($n, $type);
}