Add a unique key.

Parameters

$table: The table to be altered.

$name: The name of the key.

$fields: An array of field names.

Throws

\Drupal\Core\Database\SchemaObjectDoesNotExistException If the specified table doesn't exist.

\Drupal\Core\Database\SchemaObjectExistsException If the specified table already has a key by that name.

3 methods override Schema::addUniqueKey()

Schema::addUniqueKey in core/lib/Drupal/Core/Database/Driver/sqlite/Schema.php

Schema::addUniqueKey in core/lib/Drupal/Core/Database/Driver/mysql/Schema.php

Schema::addUniqueKey in core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php

File

core/lib/Drupal/Core/Database/Schema.php, line 457

Class

Schema

Provides a base implementation for Database Schema.

Namespace

Drupal\Core\Database

Code

abstract public function addUniqueKey($table, $name, $fields);

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