db_add_unique_key($table, $name, $fields)
Adds a unique key.
$table: The table to be altered.
$name: The name of the key.
array $fields: An array of field names.
as of Drupal 8.0.x, will be removed in Drupal 9.0.0. Instead, get a database connection injected into your service from the container, get its schema driver, and call addUniqueKey() on it. For example, $injected_database->schema()->addUniqueKey($table, $name, $fields);
\Drupal\Core\Database\Schema::addUniqueKey()
function db_add_unique_key($table, $name, $fields) {
return Database::getConnection()->schema()->addUniqueKey($table, $name, $fields);
}
© 2001–2016 by the original authors
Licensed under the GNU General Public License, version 2 and later.
Drupal is a registered trademark of Dries Buytaert.
https://api.drupal.org/api/drupal/core!includes!database.inc/function/db_add_unique_key/8.1.x