Looks like a bug in DBD::ODBC. Parameters are bound initially in ODBC at bind time and if they change at execute time they have to be rebound ODBC-wise. The following code is what tests whether a parameter needs to be rebound:
if (SvTYPE(phs->sv) != phs->sv_type /* has the type changed? */
|| (SvOK(phs->sv) && !SvPOK(phs->sv)) /* is there still a string? *
+/
|| SvPVX(phs->sv) != phs->sv_buf /* has the string buffer moved? */
) {
if (!rebind_param(sth, imp_sth, imp_dbh, phs))
croak("Can't rebind placeholder %s", phs->name);
}
Trouble is I didn't write that code which attempts to rebind the parameter ODBC-wise and although I understand the first and last test in the if condition the comment next to "(SvOK(phs->sv) && !SvPOK(phs->sv))" does not seem to agree with the code. I wonder what the original author meant. It also does not cater for a parameter being undef then a string.
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