get value from subquery in CodeIgniter

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the thing is that i don know if there is a way to get a value from a subquery over an update operation, the query that i'm trying to do looks like this, on a example code of my model :

$query = "UPDATE some_table SET value_1 = ((SELECT value_2 FROM other_table WHERE id = 2) + 1) WHERE id = 2";

$this->db->query($query);

i hope you can help me or at least let me know an alternative way to get this using the active record

PD i'm working with the CodeIgniter Framework

Posted 23-Jul-14 12:25pm

Erick Martín Garcia Vega

Updated 23-Jul-14 12:26pm

v2

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Zeeshan17 30-Aug-14 12:38pm

Sorry didn't understand what you need exactly,please be clear what you want to achieve so that i can help you.

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Tweetie Sabado · Answer 1 · 2015-02-10T19:57:00

You can call a subQuery function where

SQL

((SELECT value_2 FROM other_table WHERE id = 2) + 1)

will be executed and be used on the same model.

Example:

Controller:

PHP

$this->load->model('example_model');
$this->example_model->mainQuery();

Model:

PHP

Class Example_model Extends CI_Model
{
function subQuery()
{
$query = "SELECT value_2 FROM other_table WHERE id = 2;
$q = $this->db->query($query);
$this->mainQuery($q->result());
} 
function mainQuery($subQuery)
{
$query = "UPDATE some_table SET value_1 = "'.$subQuery.'" WHERE id = 2";
$this->db->query($query);
}
}

If you want to use the active record(recommended) instead of queries. You can start translating your queries to active records by reading this one.