how to pass variable value to sql query in codeigniter? - php

Question

is it possible to pass the variable value in mysql query in codeigniter ?
I want to select records from database that have id same as my session id.
my code is :
$this->db->select('*'); // <-- There is never any reason to write this line!
$this->db->from('products');
$this->db->where('id_admin = (SELECT id_admin FROM users WHERE id='.$this->session->userdata('user_id').')', NULL, TRUE);
can we concatenate variable values in database queries?
This code not given any error, but not give any result also.

Answer 1

Use join in active records
$this->db->select('p.*');
$this->db->from('products as p');
$this->db->join('users','p.id_admin=users.id');
$this->db->where('users.id',$this->session->userdata('user_id'),false);
$query = $this->db->get();

Answer 2

An Example Reference of how to write the JOIN Query in CI as per the Documentation of the Active Records.
$article_id = $this->input->post('article_id');
$this->db->select('*');
$this->db->from('articles');
$this->db->join('news', 'news.id = articles.id');
$this->db->where('articles.id',$article_id);
$query = $this->db->get();
The above code will produce the query as follows for execution.
SELECT * FROM articles JOIN news ON news.id = articles.id WHERE articles.id='10'
Provided the passed id is 10
In order to view the Result of the executed query you must perform the below code.
print_r($query->result());

Answer 3

Try like this..use joining of two tables.
<?php
$this->db->select('products.*');
$this->db->from('products');
$this->db->join('users','products.id_admin=users.id_admin');
$this->db->where('users.id',$this->session->userdata('user_id'));
$query = $this->db->get();
print_r($query->result_array());//your array of records