Add a unique key.

Parameters

$table: The table to be altered.

$name: The name of the key.

$fields: An array of field names.

Throws

DatabaseSchemaObjectDoesNotExistException If the specified table doesn't exist.

DatabaseSchemaObjectExistsException If the specified table already has a key by that name.

Overrides DatabaseSchema::addUniqueKey

File

drupal-7.x/includes/database/sqlite/schema.inc, line 592

Database schema code for SQLite databases.

Class

DatabaseSchema_sqlite

Code

public function addUniqueKey($table, $name, $fields) {
  if (!$this->tableExists($table)) {
    throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot add unique key %name to table %table: table doesn't exist.", array('%table' => $table, '%name' => $name)));
  }
  if ($this->indexExists($table, $name)) {
    throw new DatabaseSchemaObjectExistsException(t("Cannot add unique key %name to table %table: unique key already exists.", array('%table' => $table, '%name' => $name)));
  }

  $schema['unique keys'][$name] = $fields;
  $statements = $this->createIndexSql($table, $schema);
  foreach ($statements as $statement) {
    $this->connection->query($statement);
  }
}