| Subject: | overflow on numeric with DBD Sybase 1.15 |
| Date: | Thu, 17 Sep 2015 13:35:20 +0000 |
| To: | "'bug-DBD-Sybase [...] rt.cpan.org'" <bug-DBD-Sybase [...] rt.cpan.org> |
| From: | <sebastien.pardo [...] orange.com> |
Hello,
After upgrading to DBD Sybase 1.15, we got the following error when trying to fetch a numeric column containing a value >= 1e+36 :
DBD::Sybase::st fetch failed: OpenClient message: LAYER = (1) ORIGIN = (4) SEVERITY = (1) NUMBER = (79)
Server XNMS_ADMPP, database
Message String: ct_fetch(): user api layer: internal common library error: The bind of result set item 2 resulted in an overflow.
We checked syb_describe() outputs and noticed the following change:
DBD 1.09
syb_describe[1].maxlength = 80
syb_describe[1].sybtype = 16
DBD 1.15
syb_describe[1].maxlength = 36
syb_describe[1].sybtype = 16
We looked at get_cwidth (dbdimp.c) and saw that there was a special handling of CS_NUMERIC_TYPE and C_DECIMAL_TYPE in 1.09 that disappeared in 1.15:
case CS_NUMERIC_TYPE:
case CS_DECIMAL_TYPE:
len = (CS_MAX_PREC + 2);
break;
As a matter of fact, Sybase openclient seems to provide an hard coded length (=35) for numeric fields:
Always specify a column length of 35 when describing Sybase numeric and decimal columns
(http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.mainframeconnect_12.6.oscprcob/html/oscprcob/X42365.htm)
We then tried to restore the above piece of code on top of 1.15, and the issue disappeared.
Thanks & BRgds
Sebastien PARDO
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