#21 Columns count cache

[Martin Saturka]

TclODBC should not cache info on columns count if the
count is zero. It is so because the zero value can be a
fake one in case of some ODBC drivers and statements
info before the statements execution. One has then to
drop such a statement and to build it again to make it
work.

Look at
http://sourceforge.net/tracker/index.php?func=detail&aid=1220307&group_id=13173&atid=363173
for more information.

A hack how to solve it, is to put a small code into
statemnt.cxx file just before return from TclObj
TclStatement::ColumnCount() on line 335:
if (0 == colCount) {

colCount = -1;

return 0;

}

Best regards,
Martin