db_is_active

Determine if there is an active connection.

Note that this method will return FALSE if no connection has been established yet, even if one could be.

TRUE if there is at least one database connection established, FALSE otherwise.

authorize_filetransfer_form_submit in includes/authorize.inc: Submit callback when a file transfer is being authorized.
list_themes in includes/theme.inc: Return a list of all currently available themes.
template_preprocess in includes/theme.inc: Adds a default set of helper variables for variable processors and templates. This comes in before any other preprocess function which makes it possible to be used in default theme implementations (non-overriden theme functions).
_drupal_maintenance_theme in includes/theme.maintenance.inc: Sets up the theming system for site installs, updates and when the site is in maintenance mode. It also applies when the database is unavailable.

includes/database/database.inc, line 2218

<?php
function db_is_active() {
  return Database::isActiveConnection();
}
?>

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