Schema::renameTable

Schema::renameTable($table, $new_name)

function renameTable($table, $new_name) {
  if (!$this->tableExists($table)) {
    throw new SchemaObjectDoesNotExistException(t("Cannot rename @table to @table_new: table @table doesn't exist.", array('@table' => $table, '@table_new' => $new_name)));
  }
  if ($this->tableExists($new_name)) {
    throw new SchemaObjectExistsException(t("Cannot rename @table to @table_new: table @table_new already exists.", array('@table' => $table, '@table_new' => $new_name)));
  }

  // Get the schema and tablename for the old table.
  $old_full_name = $this->connection->prefixTables('{' . $table . '}');
  list($old_schema, $old_table_name) = strpos($old_full_name, '.') ? explode('.', $old_full_name) : array('public', $old_full_name);

  // Index names and constraint names are global in PostgreSQL, so we need to
  // rename them when renaming the table.
  $indexes = $this->connection->query('SELECT indexname FROM pg_indexes WHERE schemaname = :schema AND tablename = :table', array(':schema' => $old_schema, ':table' => $old_table_name));

  foreach ($indexes as $index) {
    // Get the index type by suffix, e.g. idx/key/pkey
    $index_type = substr($index->indexname, strrpos($index->indexname, '_') + 1);

    // If the index is already rewritten by ensureIdentifiersLength() to not
    // exceed the 63 chars limit of PostgreSQL, we need to take care of that.
    // Example (drupal_Gk7Su_T1jcBHVuvSPeP22_I3Ni4GrVEgTYlIYnBJkro_idx).
    if (strpos($index->indexname, 'drupal_') !== FALSE) {
      preg_match('/^drupal_(.*)_' . preg_quote($index_type) . '/', $index->indexname, $matches);
      $index_name = $matches[1];
    }
    else {
      // Make sure to remove the suffix from index names, because
      // $this->ensureIdentifiersLength() will add the suffix again and thus
      // would result in a wrong index name.
      preg_match('/^' . preg_quote($old_full_name) . '__(.*)__' . preg_quote($index_type) . '/', $index->indexname, $matches);
      $index_name = $matches[1];
    }
    $this->connection->query('ALTER INDEX "' . $index->indexname . '" RENAME TO ' . $this->ensureIdentifiersLength($new_name, $index_name, $index_type) . '');
  }

  // Ensure the new table name does not include schema syntax.
  $prefixInfo = $this->getPrefixInfo($new_name);

  // Rename sequences if there's a serial fields.
  $info = $this->queryTableInformation($table);
  if (!empty($info->serial_fields)) {
    foreach ($info->serial_fields as $field) {
      $old_sequence = $this->prefixNonTable($table, $field, 'seq');
      $new_sequence = $this->prefixNonTable($new_name, $field, 'seq');
      $this->connection->query('ALTER SEQUENCE ' . $old_sequence . ' RENAME TO ' . $new_sequence);
    }
  }
  // Now rename the table.
  $this->connection->query('ALTER TABLE {' . $table . '} RENAME TO ' . $prefixInfo['table']);
  $this->resetTableInformation($table);
}