Sybase Functions
PHP Manual

sybase_unbuffered_query

Send a Sybase query and do not block

Description

resource sybase_unbuffered_query ( string $query , resource $link_identifier [, bool $store_result ] )

sybase_unbuffered_query sends a query to the currently active database on the server that's associated with the specified link identifier. If the link identifier isn't specified, the last opened link is assumed. If no link is open, the function tries to establish a link as if sybase_connect was called, and use it.

Unlike sybase_query, sybase_unbuffered_query reads only the first row of the result set. sybase_fetch_array and similar function read more rows as needed. sybase_data_seek reads up to the target row. The behavior may produce better performance for large result sets.

sybase_num_rows will only return the correct number of rows if all result sets have been read. To Sybase, the number of rows is not known and is therefore computed by the client implementation.

Note:

If you don't read all of the resultsets prior to executing the next query, PHP will raise a warning and cancel all of the pending results. To get rid of this, use sybase_free_result which will cancel pending results of an unbuffered query.

Parameters

query

link_identifier

store_result

The optional store_result can be FALSE to indicate the resultsets shouldn't be fetched into memory, thus minimizing memory usage which is particularly interesting with very large resultsets.

Return Values

Returns a positive Sybase result identifier on success, or FALSE on error.

Examples

Example #1 sybase_unbuffered_query example

<?php

$dbh = sybase_connect('SYBASE', '', '');
$q = sybase_unbuffered_query('select firstname, lastname from huge_table', $dbh, false);
sybase_data_seek($q, 10000);
$i = 0;

while ($row = sybase_fetch_row($q)) {
    echo $row[0], ' ', $row[1], '<br />';
    if ($i++ > 40000) {
        break;
    }
}

sybase_free_result($q);
sybase_close($dbh);

?>

Notes

Note: This function is only available when using the CT library interface to Sybase, and not with the DB library.

See Also

  • sybase_query