<?php
/**
 * @file
 * Install, update, and uninstall functions for the field_example module.
 */

/**
 * Implements hook_field_schema().
 *
 * Defines the database schema of the field, using the format used by the
 * Schema API.
 *
 *
 * All implementations of hook_field_schema() must be in the module's
 * .install file.
 *
 * @see http://drupal.org/node/146939
 * @see schemaapi
 * @see hook_field_schema()
 * @ingroup field_example
 */

function digitalobjects_field_schema($field) {

  $columns = array(
      'objid' => array('type' => 'varchar', 'length' => 20, 'not null' => FALSE), //contains id for digitalobjects or collections
  );
  $indexes = array(
      'objid' => array('objid'),
  );
  return array(
      'columns' => $columns,
      'indexes' => $indexes,
  );
}