postgres/examples/transaction.php

#!/usr/bin/env php
<?php

require dirname(__DIR__) . '/vendor/autoload.php';

use Amp\Postgres;

Amp\Loop::run(function () {
    $pool = Postgres\pool('host=localhost user=postgres');

    yield $pool->query('DROP TABLE IF EXISTS test');

    /** @var \Amp\Postgres\Transaction $transaction */
    $transaction = yield $pool->transaction();

    yield $transaction->query('CREATE TABLE test (domain VARCHAR(63), tld VARCHAR(63), PRIMARY KEY (domain, tld))');

    /** @var \Amp\Postgres\Statement $statement */
    $statement = yield $transaction->prepare('INSERT INTO test VALUES ($1, $2)');

    yield $statement->execute('amphp', 'org');
    yield $statement->execute('google', 'com');
    yield $statement->execute('github', 'com');

    /** @var \Amp\Postgres\ResultSet $result */
    $result = yield $transaction->execute('SELECT * FROM test WHERE tld = $1', 'com');

    $format = "%-20s | %-10s\n";
    printf($format, 'TLD', 'Domain');
    while (yield $result->advance()) {
        $row = $result->getCurrent();
        printf($format, $row['domain'], $row['tld']);
    }

    yield $transaction->rollback();
});