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How to use EntityFieldQuery in Drupal 7 ?

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A full-rounded EntityFieldQuery example. @see: http://drupal.org/node/1343708
<?php
  $query = new EntityFieldQuery();
  $query->entityCondition('entity_type', 'node')
    ->entityCondition('bundle', 'article')
    ->propertyCondition('status', 1)
    ->fieldCondition('field_news_types', 'value', 'spotlight', '=')
    ->fieldCondition('field_photo', 'fid', 'NULL', '!=')
    ->fieldCondition('field_faculty_tag', 'tid', $value)
    ->fieldCondition('field_news_publishdate', 'value', $year. '%', 'like')
    ->range(0, 10)
    ->addMetaData('account', user_load(1)); // Run the query as user 1.

  $result = $query->execute();
  if (isset($result['node'])) {
    $nids = array_keys($result['node']);
    $nodes = entity_load('node', $nids);
  }
?>

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