Using join in zend social engine 4 widget

Question

I am trying to use "join" in a query while developing a widget that is within a module for Social Engine 4. I'm working in Dreamweaver. I am trying to replace this working code:

//creates query to get user's region                
$select = $db->select();
$select->from("engine4_user_fields_search");
$select->where("item_id = ?", $user_id['user_id']);
$stmt = $db->query($select);
$result = $stmt->fetchAll();

I then have to use a long if-else chain, adding and subtracting from indexes using "magic numbers" to get the result.

Using join, I wouldn't need to do all that. I could have a simple query and display the result. The widget I'm working on is in a tab container so when there is a problem (every time i use join) the whole tab disappears and makes debugging a problem.

Here is what I have:

<?php

class Widget_RegionalBreakingNewsController extends Engine_Content_Widget_Abstract
{

    public function indexAction()
    {
        //connect to DB
        $file = APPLICATION_PATH . '/application/settings/database.php';
        $options = include $file;
        $db = Zend_Db::factory($options['adapter'], $options['params']);
        $select = new Zend_Db_Select($db);
        $db->getConnection();
        //end DB setup


        $user_id = Engine_Api::_()->user()->getViewer();


        //SELECT * FROM engine4_user_fields_search as s 
        //join engine4_user_fields_options as o 
        //WHERE item_id = <current user's ID> AND s.field_7+22 = o.option_id


        $select = $db->select();
        $select->from(array('s' => 'engine4_user_fields_search'),
                      array('s.field_7', 's.user_id'))
               ->joinInner(array('o' => 'engine4_user_fields_options'),
                      's.field_7+22 = o.option_id');
        $select->where("s.item_id = ?", $user_id['user_id']);
        $stmt = $db->query($select);
        $result = $stmt->fetchAll();
        //print_r($result);

As this is my first week developing with Zend, don't dismiss even the simplest of errors. I am prone to not knowing simple conventions that may make a difference. If anyone can offer help it would be appreciated.

PS Is there anyway to not use the Zend select functions and do a regular SQL statement?

Answer 1

After having another look at your code, I think the problem is this line:

$select->from(array('s' => 'engine4_user_fields_search'),
              array('s.field_7', 's.user_id'))

You're telling it to only select two columns (equivalent to SELECT s.field_7, s.user_id FROM ...) which I don't think is what you intended? Your first example that you say works is selecting all columns from engine4_user_fields_search. You can just leave the second array off there to get all columns from that table.

Also, this:

$stmt = $db->query($select);
$result = $stmt->fetchAll();

Could be written as just:

$result = $db->fetchAll($select);

You can debug Zend_Db_Select issues by simply echoing the select object, which will give you the generated query as a string:

echo $select;

And if you prefer to write raw SQL you can just pass that to the query function as a string:

$db->query("
    SELECT * FROM engine4_user_fields_search as s 
    join engine4_user_fields_options as o 
    WHERE item_id = ? AND s.field_7+22 = o.option_id
", array($user_id['user_id']));

Answer 2

Here is the example where I am joining three table

     $opsDb = Engine_Db_Table::getDefaultAdapter();
     $ocrSelect = $opsDb->select()
                ->from(array('ops'=>'engine4_user_fields_options'), array('field_id', 'option_id','label'))
                ->join(array('map'=>'engine4_user_fields_maps'),'map.child_id = ops.field_id','')
                ->join(array('meta'=>'engine4_user_fields_meta'),'map.`child_id` = meta.field_id', '')
                ->where('map.option_id =?',$profileTypeId)
                ->where('meta.type LIKE  \'outcomeresult\'');
     $outcomeResults = $opsDb->fetchAll($ocrSelect);