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Schema API

A Drupal schema definition is an array structure representing one or more tables and their related keys and indexes. A schema is defined by hook_schema(), which usually lives in a modulename.install file.

Code

includes/database/mysql/schema.inc, line 221

<?php
protected function createKeysSql($spec) {
  $keys = array();

  if (!empty($spec['primary key'])) {
    $keys[] = 'PRIMARY KEY (' . $this->createKeysSqlHelper($spec['primary key']) . ')';
  }
  if (!empty($spec['unique keys'])) {
    foreach ($spec['unique keys'] as $key => $fields) {
      $keys[] = 'UNIQUE KEY ' . $key . ' (' . $this->createKeysSqlHelper($fields) . ')';
    }
  }
  if (!empty($spec['indexes'])) {
    foreach ($spec['indexes'] as $index => $fields) {
      $keys[] = 'INDEX ' . $index . ' (' . $this->createKeysSqlHelper($fields) . ')';
    }
  }

  return $keys;
}
?>