drupal/core/modules/action/action.install

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<?php
/**
* @file
* Install, update and uninstall functions for the Actions module.
*/
/**
* Implements hook_schema().
*/
function action_schema() {
// 'action' is a reserved SQL keyword.
$schema['actions'] = array(
'description' => 'Stores action information.',
'fields' => array(
'aid' => array(
'description' => 'Primary Key: Unique action ID.',
'type' => 'varchar',
'length' => 255,
'not null' => TRUE,
'default' => '0',
),
'type' => array(
'description' => 'The object that that action acts on (node, user, comment, system or custom types.)',
'type' => 'varchar',
'length' => 32,
'not null' => TRUE,
'default' => '',
),
'callback' => array(
'description' => 'The callback function that executes when the action runs.',
'type' => 'varchar',
'length' => 255,
'not null' => TRUE,
'default' => '',
),
'parameters' => array(
'description' => 'Parameters to be passed to the callback function.',
'type' => 'blob',
'not null' => TRUE,
'size' => 'big',
),
'label' => array(
'description' => 'Label of the action.',
'type' => 'varchar',
'length' => 255,
'not null' => TRUE,
'default' => '0',
),
),
'primary key' => array('aid'),
);
return $schema;
}