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    pg_lo_seek

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

    pg_lo_seek — Seeks position within a large object

    Descripción

    pg_lo_seek ( resource $large_object , int $offset [, int $whence = PGSQL_SEEK_CUR ] ) : bool

    pg_lo_seek() seeks a position within a large object resource.

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

    Parámetros

    large_object

    PostgreSQL large object (LOB) resource, returned by pg_lo_open().

    offset

    The number of bytes to seek.

    whence

    One of the constants PGSQL_SEEK_SET (seek from object start), PGSQL_SEEK_CUR (seek from current position) or PGSQL_SEEK_END (seek from object end) .

    Valores devueltos

    Devuelve TRUE en caso de éxito o FALSE en caso de error.

    Ejemplos

    Ejemplo #1 pg_lo_seek() example

    <?php
       $doc_oid     = 189762345;
           $database = pg_connect("dbname=jacarta");
           pg_query($database, "begin");
           $handle = pg_lo_open($database, $doc_oid, "r");
           // Skip first 50000 bytes
           pg_lo_seek($handle, 50000, PGSQL_SEEK_SET);
           // Read the next 10000 bytes
           $data = pg_lo_read($handle, 10000);
           pg_query($database, "commit");
       echo     $data;
    ?>

    Historial de cambios

    Versión Descripción
    5.6.0 Added PostgreSQL 9.3's 64bit large object support. Both client and server must support PostgreSQL 9.3 and PHP must be 64bit build to use 64bit large object.

    Ver también

    • pg_lo_tell() - Returns current seek position a of large object

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