drupal/modules/trigger/trigger.install

<?php
// $Id$

/**
 * Implementation of hook_install().
 */
function trigger_install() {
  // Create tables.
  drupal_install_schema('trigger');

  // Do initial synchronization of actions in code and the database.
  actions_synchronize(actions_list());
}

/**
 * Implementation of hook_uninstall().
 */
function trigger_uninstall() {
  // Remove tables.
  drupal_uninstall_schema('trigger');
}

/**
 * Implementation of hook_schema().
 */
function trigger_schema() {
  $schema['trigger_assignments'] = array(
    'fields' => array(
      'hook' => array('type' => 'varchar', 'length' => 32, 'not null' => TRUE, 'default' => ''),
      'op' => array('type' => 'varchar', 'length' => 32, 'not null' => TRUE, 'default' => ''),
      'aid' => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
      'weight' => array('type' => 'int', 'not null' => TRUE, 'default' => 0),
    ),
    'primary key' => array('hook', 'op', 'aid'),
  );
  return $schema;
}