why query buider codeigniter is not working? - php

Question

When I click the save button on the input form, it will run the create method,
And trying to get the data in the database, but it does not work.
Error result, like this:
A Database Error Occurred
Error Number: 1064
You have an error in your SQL syntax; check the manual that
corresponds to your MariaDB server version for the right syntax to use
near 'E 0001) AS labels FROM buku WHERE id_judul = '1'' at line 1
SELECT IFNULL(MAX(label_buku), 500 Kin E 0001) AS labels FROM buku
WHERE id_judul = '1'
Filename: models/Buku_model.php
Line Number: 33
Model :
$label = $judul->klasifikasi.' '.substr($judul->penulis,0,3).' '.substr($judul->judul_buku,0,1).' '.'0001';//500 Kin E 0001
$id_judul = $input->id_judul; //1
$label_buku = $this->db->select("IFNULL(MAX(label_buku),$label) AS labels", false)
->where('id_judul',$id_judul)
->get($this->table)->row();//error
Please help me...

Answer 1

500 Kin E 0001 needs to be quoted:
SELECT
IFNULL(MAX(label_buku), "500 Kin E 0001") AS labels
FROM buku
WHERE id_judul = '1'
So in your CodeIgniter query:
$label_buku = $this->db->select("IFNULL(MAX(label_buku),\"$label\") AS labels", false)
->where('id_judul',$id_judul)
->get($this->table)->row();