php 한글 메뉴얼 도움말 검색 사이트 Seeks position within a large object [function.pg-lo-seek]

설명

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

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.

인수

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) .

반환값

성공 시 TRUE를, 실패 시 FALSE를 반환합니다.

예제

Example #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;
?>

변경점

버전	설명
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.

참고

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