async function iterate()

in build/extracted-examples/api/hack/class.AsyncMysqlRowIterator.method.rewind/basic-usage.hack [19:56]

• 30 lines of code
• 9 McCabe index (conditional complexity)

async function iterate(): Awaitable<int> {
  $pool = new \AsyncMysqlConnectionPool(darray[]);
  $conn = await connect($pool);
  $result = await $conn->query('SELECT * FROM test_table WHERE userID < 50');
  $conn->close();
  // A call to $result->rowBlocks() actually pops the first element of the
  // row block Vector. So the call actually mutates the Vector.
  $row_blocks = $result->rowBlocks();
  if (!$row_blocks->isEmpty()) {
    // An AsyncMysqlRowBlock
    $row_block = $row_blocks[0];
    if (!$row_block->isEmpty()) {
      // An AsyncMysqlRow
      $row = $row_block->getRow(0);
      // An AsyncMysqlRowIterator
      $it = $row->getIterator();
      while ($it->valid()) {
        // current() will give you a string value of the field in the row
        if ($it->key() > 0 && \is_numeric($it->current())) {
          return \intval($it->current());
        }
        $it->next();
      }
      // If we didn't find something to return
      $it->rewind();
      while ($it->valid()) {
        // current() will give you a string value of the field in the row
        if ($it->key() > 0 && \is_string($it->current())) {
          return 1;
        }
        $it->next();
      }
    }
    return -1;
  } else {
    return -1;
  }
}