pg_send_query

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_send_query — Sendet eine asynchrone Abfrage

Beschreibung

pg_send_query(PgSql\Connection $connection, string $query): int|bool

pg_send_query() sendet eine oder mehrere asynchrone Abfragen über die Verbindung connection. Im Unterschied zu pg_query() können hier mehrere Abfragen auf einmal an PostgreSQL gesendet und die Ergebnisse nacheinander mit pg_get_result() geholt werden.

Die Ausführung eines Skripts wird während der Abarbeitung der Anfragen nicht blockiert. Benutzen Sie die Funktion pg_connection_busy(), um zu prüfen, ob die Verbindung gerade benutzt wird (z. B. ob gerade eine Abfrage ausgeführt wird). Mit der Funktion pg_cancel_query() können Abfragen gelöscht werden.

Obwohl man mehrere Abfragen auf einmal an den Server senden kann, können die Abfragen nicht über eine gerade benutzte Verbindung geschickt werden. Falls eine Abfrage gesendet wird, während die Verbindung benutzt wird, wird abgewartet, bis die letzte Abfrage fertig ist, und alle Ergebnisse werden verworfen.

Parameter-Liste

connection

Eine PgSql\Connection-Instanz.

query

Das oder die SQL-Anweisung(en), die ausgeführt werden sollen.

Daten innerhalb der Abfrage sollten ordnungsgemäß maskiert sein.

Rückgabewerte

Gibt bei Erfolg true zurück und false oder 0, falls ein Fehler auftrat. Benutzen Sie pg_get_result() um die Abfrageergebnisse zu ermitteln.

Changelog

Version	Beschreibung
8.1.0	Der Parameter `connection` erwartet nun eine PgSql\Connection-Instanz; vorher wurde eine Ressource erwartet.

Beispiele

Beispiel #1 pg_send_query()-Beispiel

<?php
  $dbconn = pg_connect("dbname=publisher") or die("Verbindungsaufbau fehlgeschlagen");

  if (!pg_connection_busy($dbconn)) {
      pg_send_query($dbconn, "select * from authors; select count(*) from authors;");
  }

  $res1 = pg_get_result($dbconn);
  echo "Der erste Aufruf von pg_get_result(): $res1\n";
  $rows1 = pg_num_rows($res1);
  echo "$res1 hat $rows1 Zeilen\n\n";

  $res2 = pg_get_result($dbconn);
  echo "Der zweite Aufruf von pg_get_result(): $res2\n";
  $rows2 = pg_num_rows($res2);
  echo "$res2 hat $rows2 Zeilen\n";
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

Der erste Aufruf von pg_get_result(): Resource id #3
Resource id #3 hat 3 Zeilen

Der zweite Aufruf von pg_get_result(): Resource id #4
Resource id #4 hat 1 Zeilen

Siehe auch

pg_query() - Führt eine Abfrage aus
pg_cancel_query() - Löscht eine asynchrone Abfrage
pg_get_result() - Liefert asynchrone Abfrageergebnisse
pg_connection_busy() - Gibt den Status der Verbindung zurück (busy/not busy)

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User Contributed Notes 6 notes

down

rw burgholzer is name at deq dot virginia dot gov ¶

15 years ago

Regarding the failure to process them all now, then retrieve the results later, I found that all queries would return successfully if I added a further condition to your while loop in the "stack_query()" method.

By adding:
&& (pg_transaction_status($conn) === PGSQL_TRANSACTION_IDLE ) )

Every query executed with no errors.

<?php
$conn = pg_connect("dbname=dbname host=localhost user=psql ");
if ($conn === FALSE)
  exit("Can't connect to db");

$q = array();
// send some queries
foreach (range(0, 50) as $i)
  stack_query($q, $conn, "SELECT 'query $i' AS str;");
// receive them
while (true)
  {
    $left = stack_query($q, $conn);
    echo "$left left... ";
    $result = pg_get_result($conn);
    if ($left == 0 && $result === FALSE)
      break;
    $row = pg_fetch_assoc($result);
    // depending on race conditions, you wont get all your original queries here.
    echo "got $row[str]\n";
  }

function stack_query(&$queries, $conn, $sql = FALSE)
{
  if ($sql !== FALSE)
    $queries[] = $sql;
  while (count($queries) && !pg_connection_busy($conn)  && (pg_transaction_status($conn) === PGSQL_TRANSACTION_IDLE ) )
    pg_send_query($conn, array_shift($queries));
  return count($queries) + (pg_connection_busy($conn) ? 1 : 0);
}
?>

down

Mikewithme at yahoo dot com ¶

21 years ago

Due to a bug, OLD API does not available with PHP 4.2.0 and 4.2.1.

PHP 4.2.2 will support OLD API again and will be kept long enough.

New API will be available PHP 4.2.0 to later versions. 
yohgaki at php dot net
19-Jun-2002 04:00 
Due to a bug, PHP 4.2.0 and 4.2.1 does not support pg_lo_import() old API. It's fixed in PHP 4.2.2.

BTW, new API will be always available from PHP 4.2.0 to later versions. Older API will be kept long enough, also. 
ceco at noxis dot net
15-May-2002 09:08 
it works for me (php-4.2.1)

not like this

int pg_lo_import ( string pathname [, resource connection])

but 
int pg_lo_import ( resource connection, string pathname )

don't know the reason

down

-1

moodsey211 at gmail dot com ¶

13 years ago

pg_send_query would not stop your script from executing but it would stop the script from exiting. 



Example:



<?php

$con = pg_connect('dbname=payroll');

pg_send_query('SELECT process_payroll()'); // Where process_payroll is a super long process

?>



You would still need to wait for the query to finish before the any display would be sent to the browser. And surprisingly, unlike pg_query this script would not generate the Maximum execution time error.

down

-2

Likeyouover others at hotmail dot com ¶

21 years ago

<?php
// --------- OPEN CONN ---

   $conn = pg_connect("host='127.0.0.1' dbname='test' user='usertest' password='passtest'");

// --------- OPEN FILE ---

   $fp = fopen('logo.gif', "r");
   $buffer = fread($fp, filesize('logo.gif'));
   fclose($fp);

// --------- CREATE - INSERT OID ---

   pg_exec($conn, "begin");

   $oid = pg_locreate($conn);

   $rs = pg_exec($conn,"INSERT INTO test(tipo, images) VALUES('A1', $oid);");
   $handle = pg_loopen ($conn, $oid, "w");

   pg_lowrite ($handle, $buffer);
   pg_loclose ($handle);

   pg_exec($conn, "commit");

// --------- OPEN - INSERT OID ---

   $rs = pg_exec($conn, "SELECT images FROM test WHERE tipo = 'A1';");
   $row = pg_fetch_row($rs, 0);

   pg_exec($conn, "begin");
   $loid = pg_loopen($conn, $row[0], "r");

   header("Content-type: image/gif");

   pg_loreadall($loid);
   pg_loclose($loid);

   pg_exec ($conn, "commit");

// --------- UNLINK OID ---

   pg_exec($conn, "begin");

   $loid = $row[0];
   pg_lounlink($conn, $loid);

   pg_exec ($conn, "commit");

// --------- DELETE OID ---

   pg_exec($conn, "DELETE FROM test WHERE tipo = 'A1';");

// --------- CLOSE CONN ---

   pg_close();
?>

down

-2

Ron Howard ¶

21 years ago

If there is an error in one of your queries, the queries following it will not get executed, and there will *not* be an error message displayed. The only way I can think of to determine if an SQL error happened is to use pg_trace.

Example:

pg_send_query($connection,
    "SELECT id FROM users;
    SELECT * FROM customers;
     [INVALID-SQL-STATEMENT];
    SELECT name FROM countries;");

while ($result = pg_get_result($connection))
    $results[] = $result;

The $results array will only have two items in it.

down

-5

vincentdephily ¶

18 years ago

Note that if you send a query without calling pg_get_result() for the previous one (supposing it has finished and the connection is not busy), the previous query will get discarded.

See for yourself (tested on php4.4.0, postgres8.0.4, Linux/FreeBSD) :
<?
$conn = pg_connect("dbname=template1 host=localhost user=pgsql");
if ($conn === FALSE)
  exit("Can't connect to db");

$q = array();
// send some queries
foreach (range(0, 500) as $i)
  stack_query($q, $conn, "SELECT 'query $i' AS str;");
// receive them
while (true)
  {
    $left = stack_query($q, $conn);
    echo "$left left... ";
    $result = pg_get_result($conn);
    if ($left == 0 && $result === FALSE)
      break;
    $row = pg_fetch_assoc($result);
    // depending on race conditions, you wont get all your original queries here.
    echo "got $row[str]\n";
  }

function stack_query(&$queries, $conn, $sql = FALSE)
{
  if ($sql !== FALSE)
    $queries[] = $sql;
  while (count($queries) && !pg_connection_busy($conn))
    pg_send_query($conn, array_shift($queries));
  return count($queries) + (pg_connection_busy($conn) ? 1 : 0);
}
?>

You will have to write a higher level of abstraction if you want a "send all queries now, receive them later" behaviour.

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