How to execute my SQL query in CodeIgniter

Question

I have a problem with my query and I need to join two tables from different databases now my problem is how can I execute my query. I got my syntax format f

Answer 1

 return $this->db->select('(CASE 
            enter code hereWHEN orderdetails.ProductID = 0   THEN dealmaster.deal_name
            WHEN orderdetails.DealID = 0 THEN products.name
            END) as product_name')

Answer 2

http://www.bsourcecode.com/codeigniter/codeigniter-select-query/

$query = $this->db->query("select * from tbl_user");

OR

$query = $this->db->select("*");
            $this->db->from('table_name');
            $query=$this->db->get();

Answer 3

$this->db->select('id, name, price, author, category, language, ISBN, publish_date');

       $this->db->from('tbl_books');

Answer 4

I can see what @Þaw mentioned :

$ENROLLEES = $this->load->database('ENROLLEES', TRUE);
$ACCOUNTS = $this->load->database('ACCOUNTS', TRUE);

CodeIgniter supports multiple databases. You need to keep both database reference in separate variable as you did above. So far you are right/correct.

Next you need to use them as below:

$ENROLLEES->query();
$ENROLLEES->result();

and

$ACCOUNTS->query();
$ACCOUNTS->result();

Instead of using

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

See this for reference: http://ellislab.com/codeigniter/user-guide/database/connecting.html

Answer 5

    $sql="Select * from my_table where 1";    
    $query = $this->db->query($SQL);
    return $query->result_array();

Answer 6

If the databases share server, have a login that has priveleges to both of the databases, and simply have a query run similiar to:

$query = $this->db->query("
SELECT t1.*, t2.id
FROM `database1`.`table1` AS t1, `database2`.`table2` AS t2
");

Otherwise I think you might have to run the 2 queries separately and fix the logic afterwards.