MySQL Bugs: #95608: Setting of statement attribute SQL_ATTR_PARAMSET

Bug #95608	Setting of statement attribute SQL_ATTR_PARAMSET_SIZE is silently ignored on OSX
Submitted:	3 Jun 2019 8:49	Modified:	3 Jun 2019 14:37
Reporter:	Yves Colombani	Email Updates:
Status:	Verified	Impact on me:	None
Category:	Connector / ODBC	Severity:	S2 (Serious)
Version:	5.3.13 and newer	OS:	Mac OS X (10.13 and 10.14)
Assigned to:		CPU Architecture:	x86
Tags:	arrays of parameters, ODBC

Description:
An application using "arrays of parameters" for a parametrised query has to set the attribute 'SQL_ATTR_PARAMSET_SIZE' to a value greater than 1 (the number of parameter sets). If the driver does not support the functionality it must report an error: apparently on OSX the ODBC connector does not report an error but ignores the setting (i.e. it processes only the first set of parameters). We can observe the issue with the precompiled drivers versions 5.3.13 and 8.0.16 (no issue with older versions) connecting to servers 5.1,5.7 and 8.0. The problem is specific to OSX: everything works as expected on Linux (I have not tested yet on Windows).

How to repeat:
I have written a small C program that shows the issue: it creates a table with a single column and tries to insert 5 rows in a single operation (using an array of parameters). It then checks the size of the table.
Depending on the version of the ODBC connector the program fails when setting the size of the array (i.e. functionality not supported), succeeds and reports that 5 rows have been inserted (i.e. functionality supported and working) or succeeds but reports only 1 row (i.e. functionality apparently supported but not working).

A program showing the issue

Attachment: csqlbug.c (text/x-csrc), 1.99 KiB.

Thank you for the bug report.