sybase_unbuffered_query
(PHP 4 >= 4.3.0, PHP 5)
sybase_unbuffered_query — Send a Sybase query and do not block
说明
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.
参数
- 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.
返回值
Returns a positive Sybase result identifier on success, or FALSE on error.
范例
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);
?>
注释
Note: 本函数仅适用于 Sybase 的 CT 库接口，而不适用于 DB 库。
