How to JOIN three tables in Codeigniter - php

Question

I'm using codeigniter framework to develop one music cms. i have 3 tables in mysql database, Currently im working in "Album" Table and "Model, Controller". i want to SELECT "Album" Table 1 and JOIN "Album" -> "cat_id" with "Category" -> "cat_id", and fetch all categories records.
Then i want to JOIN "Album" -> "album_id" on "Soundtrack" -> "album_id" then fetch all soundtrack records A to Z.
Please somebody help me to show proper codeigniter query, how i can SELECT and JOIN Tables then fetch records from 3 tables, ?
Table 1 -> Category
cat_id
cat_name
cat_title
date
Table 2 -> Album
cat_id
album_id
album_title
album_details
Table 3 -> Soundtrack
album_id
track_title
track_url
date

Answer 1

Use this code in model
public function funcname($id)
{
$this->db->select('*');
$this->db->from('Album a');
$this->db->join('Category b', 'b.cat_id=a.cat_id', 'left');
$this->db->join('Soundtrack c', 'c.album_id=a.album_id', 'left');
$this->db->where('c.album_id',$id);
$this->db->order_by('c.track_title','asc');
$query = $this->db->get();
if($query->num_rows() != 0)
{
return $query->result_array();
}
else
{
return false;
}
}

Answer 2

try this
In your model
If u want get all album data use
function get_all_album_data() {
$this->db->select ( '*' );
$this->db->from ( 'Album' );
$this->db->join ( 'Category', 'Category.cat_id = Album.cat_id' , 'left' );
$this->db->join ( 'Soundtrack', 'Soundtrack.album_id = Album.album_id' , 'left' );
$query = $this->db->get ();
return $query->result ();
}
if u want to get specific album data use
function get_album_data($album_id) {
$this->db->select ( '*' );
$this->db->from ( 'Album' );
$this->db->join ( 'Category', 'Category.cat_id = Album.cat_id' , 'left' );
$this->db->join ( 'Soundtrack', 'Soundtrack.album_id = Album.album_id' , 'left' );
$this->db->where ( 'Album.album_id', $album_id);
$query = $this->db->get ();
return $query->result ();
}

Answer 3

Try this one for data...
function get_album_data() {
$this->db->select ( 'album.*,cat.*,s_track.*' )
->from ( 'albums as album' )
->join ( 'categories cat', 'cat.cat_id = album.cat_id')
->join ( 'soundtracks s_tracks ', 's_tracks.album_id = album.album_id');
$query = $this->db->get ();
return $query->result ();
}
while for datum try this...
function get_album_datum($album_id) {
$this->db->select ( 'album.*,cat.*,s_track.*' )
->from ( 'albums as album' )
->join ( 'categories cat', 'cat.cat_id = album.cat_id')
->join ( 'soundtracks s_tracks ', 's_tracks.album_id = album.album_id');
$this->db->where ( 'album.album_id', $album_id);
$query = $this->db->get ();
return $query->row();
}7
855788

Answer 4

Check bellow code it`s working fine and common model function also
supported more then one join and also supported multiple where condition
order by ,limit.it`s EASY TO USE and REMOVE CODE REDUNDANCY.
================================================================
*Album.php
//put bellow code in your controller
=================================================================
$album_id='';//album id
//pass join table value in bellow format
$join_str[0]['table'] = 'Category';
$join_str[0]['join_table_id'] = 'Category.cat_id';
$join_str[0]['from_table_id'] = 'Album.cat_id';
$join_str[0]['join_type'] = 'left';
$join_str[1]['table'] = 'Soundtrack';
$join_str[1]['join_table_id'] = 'Soundtrack.album_id';
$join_str[1]['from_table_id'] = 'Album.album_id';
$join_str[1]['join_type'] = 'left';
$selected = "Album.*,Category.cat_name,Category.cat_title,Soundtrack.track_title,Soundtrack.track_url";
$albumData= $this->common->select_data_by_condition('Album', array('Soundtrack.album_id' => $album_id), $selected, '', '', '', '', $join_str);
//call common model function
if (!empty($albumData)) {
print_r($albumData); // print album data
}
=========================================================================
Common.php
//put bellow code in your common model file
========================================================================
function select_data_by_condition($tablename, $condition_array = array(), $data = '*', $sortby = '', $orderby = '', $limit = '', $offset = '', $join_str = array()) {
$this->db->select($data);
//if join_str array is not empty then implement the join query
if (!empty($join_str)) {
foreach ($join_str as $join) {
if ($join['join_type'] == '') {
$this->db->join($join['table'], $join['join_table_id'] . '=' . $join['from_table_id']);
} else {
$this->db->join($join['table'], $join['join_table_id'] . '=' . $join['from_table_id'], $join['join_type']);
}
}
}
//condition array pass to where condition
$this->db->where($condition_array);
//Setting Limit for Paging
if ($limit != '' && $offset == 0) {
$this->db->limit($limit);
} else if ($limit != '' && $offset != 0) {
$this->db->limit($limit, $offset);
}
//order by query
if ($sortby != '' && $orderby != '') {
$this->db->order_by($sortby, $orderby);
}
$query = $this->db->get($tablename);
//if limit is empty then returns total count
if ($limit == '') {
$query->num_rows();
}
//if limit is not empty then return result array
return $query->result_array();
}

Answer 5

Try as follows:
public function funcname($id)
{
$this->db->select('*');
$this->db->from('Album a');
$this->db->join('Category b', 'b.cat_id=a.cat_id', 'left');
$this->db->join('Soundtrack c', 'c.album_id=a.album_id', 'left');
$this->db->where('c.album_id',$id);
$this->db->order_by('c.track_title','asc');
$query = $this->db->get();
return $query->result_array();
}
If no result found CI returns false otherwise true

Answer 6

public function getdata(){
$this->db->select('c.country_name as country, s.state_name as state, ct.city_name as city, t.id as id');
$this->db->from('tblmaster t');
$this->db->join('country c', 't.country=c.country_id');
$this->db->join('state s', 't.state=s.state_id');
$this->db->join('city ct', 't.city=ct.city_id');
$this->db->order_by('t.id','desc');
$query = $this->db->get();
return $query->result();
}