async function iterate()

in build/extracted-examples/api/hack/class.AsyncMysqlRowBlockIterator.method.rewind/basic-usage.hack [19:67]

39 lines of code
10 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();
  $ret = -1;
  // 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->count() > 0) {
    // An AsyncMysqlRowBlock
    $row_block = $row_blocks[0];
    // An AsyncMysqlRowBlockIterator
    $rbit = $row_block->getIterator();
    // Iterating through a row block iterator will have an int key and
    // an AsyncMysqlRow as its value
    while ($rbit->valid()) {
      // current() gets you an AsyncMysqlRow
      $row = $rbit->current();
      // getIterator() gets you an AsyncmysqlRowIterator
      $rit = $row->getIterator();
      while ($rit->valid()) {
        // current() will give you a string value of the field in the row
        if ($rit->key() > 0 && \is_numeric($rit->current())) {
          $ret = \intval($rit->current());
          break;
        }
        $rit->next(); // move to the next field
      }
      if ($ret > -1) {
        break;
      }
      $rbit->next(); // move to the next AsyncMysqlRow
    }

    if ($ret > -1) {
      $rbit->rewind(); // Go back to the beginning of AsyncMysqlBlockIterator
      while ($rbit->valid()) {
        if ($rbit->current() is \AsyncMysqlRow) {
          $ret++;
        }
        $rbit->next();
      }
    }
    return $ret;
  } else {
    return -1;
  }
}