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Doc Bug #44305 odbc_next_result - mysql procedure with multiple results
Submitted: 2008-03-01 17:04 UTC Modified: 2021-03-26 15:33 UTC
Votes:4
Avg. Score:4.0 ± 0.0
Reproduced:4 of 4 (100.0%)
Same Version:1 (25.0%)
Same OS:0 (0.0%)
From: martin dot dufka at atlas dot cz Assigned:
Status: Verified Package: ODBC related
PHP Version: 7.3 OS: WIN2000
Private report: No CVE-ID: None
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From: martin dot dufka at atlas dot cz
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 [2008-03-01 17:04 UTC] martin dot dufka at atlas dot cz
Description:
------------
problem with: odbc_next_result()
mysql-server: 5.0.51a (.45-the same problem)
odbc driver: Driver={MySQL ODBC 3.51 Driver}

when MySQL procedure returns 2 rowsets, after the second rowset odbc_next_result() returns true. 

Reproduce code:
---------------
<?php
/*
mysql:
CREATE PROCEDURE `multiplerowsets`()
BEGIN
  select 'rs1';
  select 'rs2';
END;
*/
  $dsn="Driver={MySQL ODBC 3.51 Driver};Server=localhost;Port=3306;Database=db_name;";
  $conn=odbc_connect($dsn,'user','passwd');

  $query="call multiplerowsets";

    $result=odbc_exec($conn,$query);
    $row=odbc_fetch_array ($result); var_dump(odbc_next_result($result));
    $row=odbc_fetch_array ($result); var_dump(odbc_next_result($result));
    $row=odbc_fetch_array ($result); var_dump(odbc_next_result($result));
?>

Expected result:
----------------
bool(true) bool(false) bool(false)

Actual result:
--------------
bool(true) bool(true) 
Warning: odbc_fetch_array() [function.odbc-fetch-array]: No tuples available at this result index in D:\Apache2.2\htdocs\test\x.php on line 19
bool(false)

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 [2020-10-02 21:36 UTC] cmb@php.net
-Status: Open +Status: Verified -PHP Version: 5.2.5 +PHP Version: 7.3
 [2020-10-02 21:36 UTC] cmb@php.net
I can confirm the reported behavior for PHP-7.3 with the MySQL
ODBC 8.0 Unicode driver, while the ODBC driver 17 for SQL Server
behaves as expected.  PDO_ODBC shows basically the same behavior.

It seems to me that adding the additional result set is a quirk
of MySQL, but I don't see how that result set would be useful in
any way, since SQLNumResultCols() as well as SQLRowCount() yield
zero for it.
 [2021-03-26 15:33 UTC] cmb@php.net
-Type: Bug +Type: Documentation Problem
 [2021-03-26 15:33 UTC] cmb@php.net
This is indeed expected behavior with MySQL[1] (and maybe other
drivers):

| This is because each CALL returns a result to indicate the call
| status, in addition to any result sets that might be returned by
| statements executed within the procedure.

I think we should document that the warning can be prevented by
checking for `odbc_num_fields($result) > 0` before fetching.

[1] <https://dev.mysql.com/doc/refman/8.0/en/call.html>
 
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