Zend Framework: How to combine three tables in one query using Joins?

Question

I have three tables like this:

Person table:

person_id |    name     |   dob
--------------------------------
    1     |   Naveed    |  1988
    2     |   Ali       |  1985
    3     |   Khan      |  1987
    4     |   Rizwan    |  1984

Address table:

address_id |  street  |   city  |  state  | country
----------------------------------------------------
   1       | MAJ Road | Karachi |  Sindh  | Pakistan
   2       | ABC Road | Multan  |  Punjab | Pakistan
   3       | XYZ Road | Riyadh  |    SA   | SA

Person_Address table:

person_id | address_id
----------------------
   1      |     1
   2      |     2
   3      |     3

Now I want to get all records of Person_Address table but also with their person and address records like this by one query:

person_id|    name  |  dob  | address_id |  street  |   city  |  state  | country
----------------------------------------------------------------------------------
    1    |   Naveed |  1988 |    1       | MAJ Road | Karachi |  Sindh  | Pakistan
    2    |   Ali    |  1985 |    2       | ABC Road | Multan  |  Punjab | Pakistan 
    3    |   Khan   |  1987 |    3       | XYZ Road | Riyadh  |    SA   | SA

How it is possible using zend? Thanks

Answer 1

The reference guide is the best starting point to learn about Zend_Db_Select. Along with my example below, of course:

//$db is an instance of Zend_Db_Adapter_Abstract
$select = $db->select();
$select->from(array('p' => 'person'), array('person_id', 'name', 'dob'))
       ->join(array('pa' => 'Person_Address'), 'pa.person_id = p.person_id', array())
       ->join(array('a' => 'Address'), 'a.address_id = pa.address_id', array('address_id', 'street', 'city', 'state', 'country'));

It's then as simple as this to fetch a row:

$db->fetchRow($select);

In debugging Zend_Db_Select there's a clever trick you can use - simply print the select object, which in turn invokes the toString method to produce SQl:

echo $select; //prints SQL