AsyncMysqlRowIterator::next

Description

public function next(): void

Advance the iterator to the next field (column).

Examples

The following example shows you how to use AsyncMysqlRowIterator::next to move on to the next field in the iterator, assuming one exists.

<?hh

namespace Hack\UserDocumentation\API\Examples\AsyncMysql\RowIt\Next;

use \Hack\UserDocumentation\API\Examples\AsyncMysql\ConnectionInfo as CI;

async function connect(\AsyncMysqlConnectionPool $pool):
  Awaitable<\AsyncMysqlConnection> {
  return await $pool->connect(
    CI::$host,
    CI::$port,
    CI::$db,
    CI::$user,
    CI::$passwd
  );
}
async function iterate(): Awaitable<int> {
  $pool = new \AsyncMysqlConnectionPool(array());
  $conn = await connect($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(); // The next field in the iterator
      }
    }
    return -1;
  } else {
    return -1;
  }
}

function run(): void {
  $r = \HH\Asio\join(iterate());
  var_dump($r);
}

run();
Output
int(41)