Codeigniter query with alias and number as column - codeigniter

Question

I would like to replace column name with numbers in codeigniter
It does work well with letters but not with numbers
$this->db->select ('Observation.id_observation as 1');
$this->db->from ( 'Observation' );
$this->db->join ( 'Enregistrement', 'Enregistrement.id_observation =
Observation.id_observation' , 'left' );
$this->db->where('Observation.id_parcelle', $id_parcelle);
$this->db->where('Observation.id_observateur', $user_id);
$this->db->where('Observation.date_observation >=', $date_start);
$this->db->where('Observation.date_observation <=', $date_end);
return $this->db->get()->result();

Answer 1

Try the following
$this->db->select ('Observation.id_observation as `1`');
This will generate query as
Select `observation` as `1`....
From the Docs
Identifiers may begin with a digit but unless quoted may not consist solely of digits.

Answer 2

You can set alias name as string so you need to give within single quotes otherwise you will get syntax error
$this->db->select ('Observation.id_observation as `1`',FALSE);
$this->db->from ( 'Observation' );
$this->db->join ( 'Enregistrement', 'Enregistrement.id_observation =
Observation.id_observation' , 'left' );
$this->db->where('Observation.id_parcelle', $id_parcelle);
$this->db->where('Observation.id_observateur', $user_id);
$this->db->where('Observation.date_observation >=', $date_start);
$this->db->where('Observation.date_observation <=', $date_end);
return $this->db->get()->result();
OR
$var = '1';
$this->db->select ('Observation.id_observation as `'.$var.'`',FALSE);
OR
$query=$this->db->query('SELECT Observation.id_observation as "1" FROM Observation LEFT JOIN Enregistrement ON Enregistrement.id_observation =
Observation.id_observation WHERE Observation.id_parcelle = '.$id_parcelle.' AND Observation.id_observateur = '.$user_id.' AND Observation.date_observation >= "'.$date_start.'" AND Observation.date_observation <= "'.$date_end.'" ');
return $query->result();

Answer 3

You can try this:
$this->db->select ("Observation.id_observation as '1'");
Hope It will work.

Answer 4

This is what i had to do in the controller ! I very don't like this solultion but it does work:
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT
Observation.id_observation as '0',
Observation.checkseries as '1'
FROM Observation
LEFT JOIN Enregistrement ON Enregistrement.id_observation = Observation.id_observation
WHERE
Observation.id_parcelle = '$parcellecultures->id_parcelle'
AND Observation.id_observateur = '$user'
AND Observation.date_observation >= '$date_start'
AND Observation.date_observation <= '$date_end'
";
//echo $sql;
$result = $conn->query($sql);
//print_r($result);exit;
$conn->close();
I still look for another solution ....