SYBASE_UNBUFFERED_QUERY(3) SYBASE_UNBUFFERED_QUERY(3)
sybase_unbuffered_query - Send a Sybase query and do not block
SYNOPSIS
resource sybase_unbuffered_query (string $query, resource $link_identifier, [bool $store_result])
DESCRIPTION
sybase_unbuffered_query(3) sends a query to the currently active database on the server that's associated with the specified link identi-
fier. 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(3) was called, and use it.
Unlike sybase_query(3), sybase_unbuffered_query(3) reads only the first row of the result set. sybase_fetch_array(3) and similar function
read more rows as needed. sybase_data_seek(3) reads up to the target row. The behavior may produce better performance for large result
sets.
sybase_num_rows(3) 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(3) which will cancel pending results of an unbuffered query.
PARAMETERS
o $query
-
o $link_identifier
-
o $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(3) 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(3).
PHP Documentation Group SYBASE_UNBUFFERED_QUERY(3)
