Coroutine\PostgreSQL->prepare

预处理

function Coroutine\PostgreSQL->prepare( string $name, string $sql);
function Coroutine\PostgreSQL->execute ( string $name, array $bind);

example:

go(function () {
    $pg = new Swoole\Coroutine\PostgreSQL();
    $conn  = $pg -> connect ("host=127.0.0.1 port=5432 dbname=test user=wuzhenyu password=112");
    $pg -> prepare("my_query","select * from  test where id > $1 and id < $2");
    $res = $pg->execute("my_query", array(1,3));
    $arr = $pg -> fetchAll($res);
    var_dump($arr);
});