Add a unique key.

Parameters

$table: The table to be altered.

$name: The name of the key.

$fields: An array of field names.

Overrides Schema::addUniqueKey

File

core/modules/sqlite/src/Driver/Database/sqlite/Schema.php, line 724

Class

Schema

SQLite implementation of \Drupal\Core\Database\Schema.

Namespace

Drupal\sqlite\Driver\Database\sqlite

Code

public function addUniqueKey($table, $name, $fields) {
  if (!$this->tableExists($table)) {
    throw new SchemaObjectDoesNotExistException("Cannot add unique key '{$name}' to table '{$table}': table doesn't exist.");
  }
  if ($this->indexExists($table, $name)) {
    throw new SchemaObjectExistsException("Cannot add unique key '{$name}' to table '{$table}': unique key already exists.");
  }
  $schema['unique keys'][$name] = $fields;
  $statements = $this->createIndexSql($table, $schema);
  foreach ($statements as $statement) {
    $this->connection
      ->query($statement);
  }
}

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