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Deleting Content Type, nodes and Fields <= hook_uninstall()

// Get all node IDs with windfarm content type.
  $sql_query  = 'SELECT nid ';
  $sql_query .= 'FROM {node} ';
  $sql_query .= 'WHERE {node}.type = :type ';
  $result = db_query($sql_query, array(':type' => 'windfarm'));

  $nids = array();
  foreach ($result as $row) {
    $nids[] = $row->nid;
  }

  // Delete all example content.
  node_delete_multiple($nids);
  drupal_set_message($t('Wind Farms content removed.'));

  // Remove all fields and field instances.
  foreach (field_info_instances('node', 'example') as $field_name => $instance) {
    field_delete_field($field_name);
    field_delete_instance($instance);
  }
  drupal_set_message($t('example field and field instances removed.'));

  // Delete the content type.
  node_type_delete('example');
  drupal_set_message($t('example Content Type removed.'));

  // Clean up deleted fields.
  field_purge_batch(1000);

code type: 
hook_drupal