Perform setup tasks when the module is installed.

If the module implements hook_schema(), the database tables will be created before this hook is fired.

Implementations of this hook are by convention declared in the module's .install file. The implementation can rely on the .module file being loaded. The hook will only be called the first time a module is enabled or after it is re-enabled after being uninstalled. The module's schema version will be set to the module's greatest numbered update hook. Because of this, any time a hook_update_N() is added to the module, this function needs to be updated to reflect the current version of the database schema.

See the Schema API documentation for details on hook_schema and how database tables are defined.

Note that since this function is called from a full bootstrap, all functions (including those in modules enabled by the current page request) are available when this hook is called. Use cases could be displaying a user message, or calling a module function necessary for initial setup, etc.

Please be sure that anything added or modified in this function that can be removed during uninstall should be removed with hook_uninstall().

See also

hook_schema()

module_enable()

hook_enable()

hook_disable()

hook_uninstall()

hook_modules_installed()

Related topics

File

modules/system/system.api.php, line 3310

Hooks provided by Drupal core and the System module.

Code

function hook_install() {
  // Populate the default {node_access} record.
  db_insert('node_access')->fields(array(
    'nid' => 0,
    'gid' => 0,
    'realm' => 'all',
    'grant_view' => 1,
    'grant_update' => 0,
    'grant_delete' => 0,
  ))->execute();
}