How do I use this to check if a retrieved value is NULL or not.
I tried like this
row = (*i);
name = row["name"];
mysqlpp::Null<unsigned char>
nullField(mysqlpp::null);
if(nullField == row["name"]) {
cout << " NULL VALUE" <<
endl;
}
Certainly what I am doing is wrong for I am getting errors like this
est.cpp:56: error: ambiguous overload for 'operator=' in 'name =
mysqlpp::Row::operator[](const char*) const(((const char*)"name"))'
/usr/lib/gcc/i386-redhat-linux/3.4.6/../../../../include/c++/3.4.6/bits/basic_string.h:437:
note: candidates are: std::basic_string<_CharT, _Traits, _Alloc>&
std::basic_string<_CharT, _Traits, _Alloc>::operator=(const _CharT*) [with
_CharT = char, _Traits = std::char_traits<char>, _Alloc =
std::allocator<char>]
/usr/lib/gcc/i386-redhat-linux/3.4.6/../../../../include/c++/3.4.6/bits/basic_string.h:451:
note: std::basic_string<_CharT, _Traits, _Alloc>&
std::basic_string<_CharT, _Traits, _Alloc>::operator=(_CharT) [with _CharT =
char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]
test.cpp:58: error: ambiguous overload for 'operator==' in 'nullField ==
mysqlpp::Row::operator[](const char*) const(((const char*)"name"))'
Can you tell me how do I use it correctly.
2009/3/19 Warren Young <mysqlpp@stripped>
> On Mar 19, 2009, at 4:40 AM, Jithin Emmanuel wrote:
>
> Is there a better way to check if a field is NULL or not
>>
>
> http://tangentsoft.net/mysql++/doc/html/userman/tutorial.html#sql-null
>
>
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--
Regards
Jithin Emmanuel
http://spotm.in
Samuel Beckett - "Birth was the death of him."
