indexed_query.inc

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<?php
/**************************************************************
 
 Copyright (c) 2007-2010 Sonjara, Inc
 
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 obtaining a copy of this software and associated documentation
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 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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require_once realpath(dirname(__FILE__)."/query.inc");
 
class IndexedQuery extends AbstractQuery
{
     var $indexBy;
     
     public function __construct($class, $constraints = "", $indexBy = "")
     {
          parent::__construct($class, $constraints);
          $this->indexBy = $indexBy;
     }
     
     function indexBy($indexBy)
     {
          $this->indexBy = $indexBy;
          return $this;
     }
     
     function execute()
     {
          $prototype = new $this->class;
     
          if (!$this->indexBy) $this->indexBy = $prototype->getPrimaryKey();
          
          if ($this->filter)
          {
               $prototype->filter = $this->filter;
          }
          
          $order_by_idx = strpos(strtoupper($this->constraints), "ORDER BY");   
          if ($order_by_idx !== false)
          {
               $orderBy = substr($this->constraints, $order_by_idx);
               
               $this->constraints = substr($this->constraints, 0, $order_by_idx);
          } 
          
          $fields = $prototype->getFieldList();
          
          if ($this->constraints == "") $this->constraints = "WHERE 1=1"; 
          $query = "SELECT $fields FROM {$prototype->table} {$this->constraints} ".$prototype->getIdentityConstraint()." $orderBy";
          trace("DataItem indexedQuery(): $query", 3);
          
          $items = array();
          
          $field = $this->indexBy;
          
          $useFormat = preg_match("/^[A-Za-z0-9_]*$/", $field) ? false : true;
          
          try
          {
               $db = ConnectionManager::getConnection();
     
               $result = $db->prepare($query);
               $result->execute($this->params);
               
               while($line = $result->fetch())
               {
                    $item = new $this->class;
                    $item->populate($line);
          
                    $val = ($useFormat) ? $item->format($field) : $item->get($field);
                    
                    if (array_key_exists($val, $items))
                    {    
                         // Implicitly promote to array if there is a collision
                         if (!is_array($items[$val]))
                         {
                              $items[$val] = array($items[$val]);
                         }
                         $items[$val][] = $item;
                    }
                    else
                    {
                         $items[$val] = $item;
                    }
               }
               
               unset($result);
          }
          catch(PDOException $e)
          {
               $err = "indexedQuery() failed - " . $e->getMessage();
               trace($err, 2);
               throw new DataItemException($err);
          }
          
          return $items; 
     }
     
     static function create($class, $constraints = "", $indexBy = "")
     {
          return new IndexedQuery($class, $constraints, $indexBy);
     }
}
 
 
function indexedQuery($class)
{
     $field = $prototype->primary_key;
     $filter = null;
     
     $query = new IndexedQuery($class);
     
     if (func_num_args() > 1)
     {
          $query->constraints(func_get_arg(1));
          
          if (func_num_args() > 2)
          {
               $query->indexBy(func_get_arg(2));
               
               if (func_num_args() > 3)
               {
                    $query->filter(func_get_arg(3));
               } 
          }         
     }
 
     return $query->execute();
}?>