AsyncMysqlRowBlock::isEmpty
Returns whether there were any rows are returned in the current row block
public function isEmpty(): bool;
Returns
bool
-true
if there are rows;false
otherwise.
Examples
The following example uses AsyncMysqlRowBlock::isEmpty
to determine whether there are actually any row_blocks returned from the call to AsyncMysqlRowBlock::rowBlocks()
method
require __DIR__.'/../../__includes/async_mysql_connect.inc.php';
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 simple_query(): 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];
return $row_block->count(); // int
} else {
return -1;
}
}
function run(): void {
$r = \HH\Asio\join(simple_query());
\var_dump($r);
}
run();
int(2)