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PHP : Function Reference : PostgreSQL Functions : pg_lo_seek

pg_lo_seek

Seeks position within a large object (PHP 4 >= 4.2.0, PHP 5)
bool pg_lo_seek ( resource large_object, int offset [, int whence] )

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.

Parameters

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) .

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example 1950. pg_lo_seek() example

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<?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;
?>

See Also

pg_lo_tell()

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pg_host
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pg_lo_close
pg_lo_create
pg_lo_export
pg_lo_import
pg_lo_open
pg_lo_read_all
pg_lo_read
pg_lo_seek
pg_lo_tell
pg_lo_unlink
pg_lo_write
pg_meta_data
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pg_num_rows
pg_options
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pg_set_client_encoding
pg_set_error_verbosity
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