function db_add_unique_key in Drupal 7

Same name and namespace in other branches

1. 8 core/includes/database.inc \db_add_unique_key()
2. 6 includes/database.mysql-common.inc \db_add_unique_key()
3. 6 includes/database.pgsql.inc \db_add_unique_key()

Adds a unique key.

Parameters

$table: The table to be altered.

$name: The name of the key.

$fields: An array of field names.

Related topics

3 calls to db_add_unique_key()

node_update_7013 in modules/node/node.install

Change {node}.vid default value from 0 to NULL to avoid deadlock issues on MySQL.

system_update_7073 in modules/system/system.install

Add binary to {file_managed}, in case system_update_7034() was run without it.

taxonomy_update_7002 in modules/taxonomy/taxonomy.install

Add {vocabulary}.machine_name column.

File

includes/database/database.inc, line 3040

Core systems for the database layer.

Code

function db_add_unique_key($table, $name, $fields) {
  return Database::getConnection()
    ->schema()
    ->addUniqueKey($table, $name, $fields);
}