pg_lo_create

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

    pg_lo_create — Create a large object

    Description

    pg_lo_create(PgSql\Connection $connection = ?, mixed $object_id = ?): int
    pg_lo_create(mixed $object_id): int

    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().

    Note:

    This function used to be called pg_locreate().

    Parameters

    connection

    An PgSql\Connection instance. When connection is unspecified, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().

    Warning

    As of PHP 8.1.0, using the default connection is deprecated.

    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 relies on functionality that first appeared in PostgreSQL 8.1.

    Return Values

    A large object OID, or false on failure.

    Changelog

    Version Description
    8.1.0 The connection parameter expects an PgSql\Connection instance now; previously, a resource was expected.

    Examples

    Example #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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    User Contributed Notes 1 note

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    andrea dot galli at acotel 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();
    ?>
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