DbDumpCommand::getTableIndexes

protected DbDumpCommand::getTableIndexes(Connection $connection, $table, &$definition)

protected function getTableIndexes(Connection $connection, $table, &$definition) {
  // Note, this query doesn't support ordering, so that is worked around
  // below by keying the array on Seq_in_index.
  $query = $connection->query("SHOW INDEX FROM {" . $table . "}");
  while (($row = $query->fetchAssoc()) !== FALSE) {
    $index_name = $row['Key_name'];
    $column = $row['Column_name'];
    // Key the arrays by the index sequence for proper ordering (start at 0).
    $order = $row['Seq_in_index'] - 1;

    // If specified, add length to the index.
    if ($row['Sub_part']) {
      $column = [$column, $row['Sub_part']];
    }

    if ($index_name === 'PRIMARY') {
      $definition['primary key'][$order] = $column;
    }
    elseif ($row['Non_unique'] == 0) {
      $definition['unique keys'][$index_name][$order] = $column;
    }
    else {
      $definition['indexes'][$index_name][$order] = $column;
    }
  }
}