function Schema::addUniqueKey

Same name in this branch
  1. 9.x drupal/core/lib/Drupal/Core/Database/Schema.php \Drupal\Core\Database\Schema::addUniqueKey()
  2. 9.x drupal/core/lib/Drupal/Core/Database/Driver/mysql/Schema.php \Drupal\Core\Database\Driver\mysql\Schema::addUniqueKey()
  3. 9.x drupal/core/lib/Drupal/Core/Database/Driver/sqlite/Schema.php \Drupal\Core\Database\Driver\sqlite\Schema::addUniqueKey()
  4. 9.x drupal/core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php \Drupal\Core\Database\Driver\pgsql\Schema::addUniqueKey()

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.

Overrides Schema::addUniqueKey

1 call to Schema::addUniqueKey()
Schema::_createKeys in drupal/core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php

File

drupal/core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php, line 466
Definition of Drupal\Core\Database\Driver\pgsql\Schema

Class

Schema

Namespace

Drupal\Core\Database\Driver\pgsql

Code

function addUniqueKey($table, $name, $fields) {
  if (!$this
    ->tableExists($table)) {
    throw new SchemaObjectDoesNotExistException(t("Cannot add unique key @name to table @table: table doesn't exist.", array(
      '@table' => $table,
      '@name' => $name,
    )));
  }
  if ($this
    ->constraintExists($table, $name . '_key')) {
    throw new SchemaObjectExistsException(t("Cannot add unique key @name to table @table: unique key already exists.", array(
      '@table' => $table,
      '@name' => $name,
    )));
  }
  $this->connection
    ->query('ALTER TABLE {' . $table . '} ADD CONSTRAINT "' . $this
    ->prefixNonTable($table, $name, 'key') . '" UNIQUE (' . implode(',', $fields) . ')');
}