pg_lo_create

(PHP 4 >= 4.2.0, PHP 5)

pg_lo_createCreate a large object

Descripción

int pg_lo_create ([ resource $connection [, mixed $object_id ]] )
int pg_lo_create ( mixed $object_id )

pg_lo_create() creates a large object and returns the OID of the large object. PostgreSQL access modes INV_READ, INV_WRITE, and INV_ARCHIVE are not supported, the object is created always with both read and write access. INV_ARCHIVE has been removed from PostgreSQL itself (version 6.3 and above).

To use the large object interface, it is necessary to enclose it within a transaction block.

Instead of using the large object interface (which has no access controls and is cumbersome to use), try PostgreSQL's bytea column type and pg_escape_bytea().

Nota:

This function used to be called pg_locreate().

Parámetros

connection

PostgreSQL database connection resource. When connection is not present, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().

object_id

If an object_id is given the function will try to create a large object with this id, else a free object id is assigned by the server. The parameter was added in PHP 5.3 and relies on functionality that first appeared in PostgreSQL 8.1.

Valores devueltos

A large object OID or FALSE on error.

Historial de cambios

Versión Descripción
5.3.0

The optional object_id was added.

Ejemplos

Ejemplo #1 pg_lo_create() example

<?php
   $database 
pg_connect("dbname=jacarta");
   
pg_query($database"begin");
   
$oid pg_lo_create($database);
   echo 
"$oid\n";
   
$handle pg_lo_open($database$oid"w");
   echo 
"$handle\n";
   
pg_lo_write($handle"large object data");
   
pg_lo_close($handle);
   
pg_query($database"commit");
?>

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andrea dot galli at acotel dot com
11 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();
?>
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