function drupal_get_installed_schema_version

Returns the currently installed schema version for a module.

Parameters

$module: A module name.

$reset: Set to TRUE after modifying the system table.

$array: Set to TRUE if you want to get information about all modules in the system.

Return value

The currently installed schema version, or SCHEMA_UNINSTALLED if the module is not installed.

File

drupal/includes/install.inc, line 146

API functions for installing modules and themes.

Code

function drupal_get_installed_schema_version($module, $reset = FALSE, $array = FALSE) {
  static $versions = array();
  if ($reset) {
    $versions = array();
  }
  if (!$versions) {
    $versions = array();
    $result = db_query("SELECT name, schema_version FROM {system} WHERE type = :type", array(
      ':type' => 'module',
    ));
    foreach ($result as $row) {
      $versions[$row->name] = $row->schema_version;
    }
  }
  if ($array) {
    return $versions;
  }
  else {
    return isset($versions[$module]) ? $versions[$module] : SCHEMA_UNINSTALLED;
  }
}