Returns the currently installed schema version for a module.
$module: A module name.
$reset: Set to TRUE after modifying the system table.
$array: Set to TRUE if you want to get information about all modules in the system.
The currently installed schema version, or SCHEMA_UNINSTALLED if the module is not installed.
function drupal_get_installed_schema_version($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;
}
}