PHP with sqlsrv_num_rows - php

Question

I'm attempting to execute a query of a SQL Server database, looking at a many to many relationship. I link the table I want the rows from with the relationship table, and plug in the unique id, in this case the $guid.
The query is functional, sometimes. It will work, and then I switch out solely the $guid for another one, and it fails, even though I'm staring at the table and it has values associated with that new $guid.
<?php
$guid = '{893C7BF8-E8C5-41D5-9C61-A72CF62DDBA8}';
// Connect to Database
$server = "###($#";
$connectionSettings = array("Database"=>"db", "UID"=>"user", "PWD"=>"pword");
$connection = sqlsrv_connect($server, $connectionSettings);
if (!$connection){
die("Failed Connection");
}
// Prepare and Execute Query
$sql = "SELECT *
FROM STREAMS.ATTACHMENTS a INNER JOIN STREAMS.RELATTACHMENTS ra
ON a.ROWGUID = ra.ATTACHMENT_GUID
WHERE ra.FEATURE_GUID = '" . $guid . "'";
$results = sqlsrv_query($connection, $sql);
$rowCount = sqlsrv_num_rows( $results );
if ($rowCount === false)
echo "failure";
else
echo $rowCount;
while($row = sqlsrv_fetch_array($results)){
echo "loop";
}
?>
Even stranger, the output to this code is the following:
failurelooploop
So that implies that the sqlsrv_num_rows command counted no rows in the result... but it also implies that the same results set has 2 rows, since the while loop went around twice.
Can anybody explain this funky behavior?
Thanks.

Answer 1

I will bet that you have some sort of error: sqlsrv_num_rows will return FALSE if something goes wrong. You can get the error output through:
// probably don't want this in production.
print_r( sqlsrv_errors());
I'll guess the cause has to do with your guid column, but I can't be sure. :-)
Oh, and unless you need the number of rows, don't use it. Use do... while instead:
$row = sqlsrv_fetch_array($results);
if($row)
{
do{
echo "loop";
} while( $row = sqlsrv_fetch_array( $results ) );
}
else
{
// No results found
// you can output print_r( sqlsrv_errors() ); here
}

Answer 2

This error shows for cursor type SQLSRV_CURSOR_FORWARD & SQLSRV_CURSOR_DYNAMIC . my personal preference is not to use it. if you still want to use it pass extra parameter to query function like :
$stmt = sqlsrv_query( $connection, $sql, array(), array( "Scrollable" => 'keyset' ));
// $stmt = sqlsrv_query( $connection, $sql, array(), array( "Scrollable" => 'dynamic' ));
// $stmt = sqlsrv_query( $connection, $sql, array(), array( "Scrollable" => 'static' ));
check more : https://msdn.microsoft.com/en-us/library/hh487160.aspx
-- http://php.net/manual/en/function.sqlsrv-query.php