How to read column type Text from MySQL?

[AmauryPG]

I am trying to get information from a MySQL table, with a column type "text".
I am certain my connection to the database works, because I can already read the other column of the table.

This is my table.

CREATE TABLE `rfnode` (
  `mac` varchar(16) NOT NULL,
  `unit` text NOT NULL,
  PRIMARY KEY (`mac`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

try
{		
  Poco::Data::MySQL::Connector::registerConnector();
  
  Poco::Data::SessionFactory &oSessionFactory = Poco::Data::SessionFactory::instance();
  
  Poco::Data::Session m_POCOoSession(oSessionFactory.create(Poco::Data::MySQL::Connector::KEY, getSessionInfo()));
  
  Poco::Data::Statement statment = mySQLQuery(m_POCOoSession, "SELECT * from rfnode rn WHERE  rn.mac = 'Big Mac'");
  
  Poco::Data::RecordSet rs(statment);
  
  std::cout << typeid(rs.value("unit")).name() << std::endl;
  std::cout << rs.value("unit").type().name() << std::endl;
  std::cout << typeid(rs.value("unit").convert<std::string>()).name() << std::endl;
  std::cout << rs.value("unit").convert<std::string>() << std::endl;
}
catch (std::exception &e)
{
  Logger::printLine(Logger::LEVEL_ERROR, std::string("Exception at ") + __FILE__ + ":" + std::to_string(__LINE__) + " (" + e.what() + ")");
}

This is the ouptut :
N4Poco7Dynamic3VarE N4Poco4Data3LOBIhEE NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE 2022-10-17T19:00:23Z [ERR ] Exception at ./DataBase.cpp:544 (Bad cast exception)

I have already tried to cast LOB to the column with this code:

try
{		
  Poco::Data::MySQL::Connector::registerConnector();
  
  Poco::Data::SessionFactory &oSessionFactory = Poco::Data::SessionFactory::instance();
  
  Poco::Data::Session m_POCOoSession(oSessionFactory.create(Poco::Data::MySQL::Connector::KEY, getSessionInfo()));
  
  Poco::Data::Statement statment = mySQLQuery(m_POCOoSession, "SELECT * from rfnode rn WHERE  rn.mac = 'Big Mac'  OR  rn.unit = 'unit'  OR  (rn.type = 0 AND rn.functionality = 0) OR rn.lastContact >= '2022-10-17T19:00:23Z'");
  
  Poco::Data::RecordSet rs(statment);
  
  std::cout << typeid(rs.value("unit")).name() << std::endl;
  std::cout << rs.value("unit").type().name() << std::endl;
  std::cout << typeid(rs.value("unit").convert<std::string>()).name() << std::endl;
  std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
}
catch (std::exception &e)
{
  Logger::printLine(Logger::LEVEL_ERROR, std::string("Exception at ") + __FILE__ + ":" + std::to_string(__LINE__) + " (" + e.what() + ")");
}

Building the code with the cast LOB, I get an error.

./DataBase.cpp: In static member function 'static std::vector<RFNode> DataBase::getNodes(std::string, std::string, std::vector<std::pair<int, int> >, Poco::DateTime, bool)':
./DataBase.cpp:489:14: error: no match for 'operator<<' (operand types are 'std::ostream' {aka 'std::basic_ostream<char>'} and 'Poco::Data::LOB<std::__cxx11::basic_string<char> >')
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |    ~~~~~~~~~ ^~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |         |                                                             |
      |         std::ostream {aka std::basic_ostream<char>}                   Poco::Data::LOB<std::__cxx11::basic_string<char> >
In file included from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/ostream:108:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__ostream_type& (*)(std::basic_ostream<_CharT, _Traits>::__ostream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  108 |       operator<<(__ostream_type& (*__pf)(__ostream_type&))
      |       ^~~~~~~~
/usr/include/c++/10/ostream:108:36: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'std::basic_ostream<char>::__ostream_type& (*)(std::basic_ostream<char>::__ostream_type&)' {aka 'std::basic_ostream<char>& (*)(std::basic_ostream<char>&)'}
  108 |       operator<<(__ostream_type& (*__pf)(__ostream_type&))
      |                  ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/10/ostream:117:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__ios_type& (*)(std::basic_ostream<_CharT, _Traits>::__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>; std::basic_ostream<_CharT, _Traits>::__ios_type = std::basic_ios<char>]'
  117 |       operator<<(__ios_type& (*__pf)(__ios_type&))
      |       ^~~~~~~~
/usr/include/c++/10/ostream:117:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'std::basic_ostream<char>::__ios_type& (*)(std::basic_ostream<char>::__ios_type&)' {aka 'std::basic_ios<char>& (*)(std::basic_ios<char>&)'}
  117 |       operator<<(__ios_type& (*__pf)(__ios_type&))
      |                  ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
/usr/include/c++/10/ostream:127:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::ios_base& (*)(std::ios_base&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  127 |       operator<<(ios_base& (*__pf) (ios_base&))
      |       ^~~~~~~~
/usr/include/c++/10/ostream:127:30: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'std::ios_base& (*)(std::ios_base&)'
  127 |       operator<<(ios_base& (*__pf) (ios_base&))
      |                  ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
/usr/include/c++/10/ostream:166:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  166 |       operator<<(long __n)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:166:23: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'long int'
  166 |       operator<<(long __n)
      |                  ~~~~~^~~
/usr/include/c++/10/ostream:170:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  170 |       operator<<(unsigned long __n)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:170:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'long unsigned int'
  170 |       operator<<(unsigned long __n)
      |                  ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/ostream:174:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(bool) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  174 |       operator<<(bool __n)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:174:23: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'bool'
  174 |       operator<<(bool __n)
      |                  ~~~~~^~~
In file included from /usr/include/c++/10/ostream:784,
                 from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/bits/ostream.tcc:91:5: note: candidate: 'std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short int) [with _CharT = char; _Traits = std::char_traits<char>
'
   91 |     basic_ostream<_CharT, _Traits>::
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/10/bits/ostream.tcc:92:22: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'short int'
   92 |     operator<<(short __n)
      |                ~~~~~~^~~
In file included from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/ostream:181:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(short unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  181 |       operator<<(unsigned short __n)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:181:33: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'short unsigned int'
  181 |       operator<<(unsigned short __n)
      |                  ~~~~~~~~~~~~~~~^~~
In file included from /usr/include/c++/10/ostream:784,
                 from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/bits/ostream.tcc:105:5: note: candidate: 'std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(int) [with _CharT = char; _Traits = std::char_traits<char>]'
  105 |     basic_ostream<_CharT, _Traits>::
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/10/bits/ostream.tcc:106:20: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'int'
  106 |     operator<<(int __n)
      |                ~~~~^~~
In file included from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/ostream:192:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  192 |       operator<<(unsigned int __n)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:192:31: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'unsigned int'
  192 |       operator<<(unsigned int __n)
      |                  ~~~~~~~~~~~~~^~~
/usr/include/c++/10/ostream:201:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  201 |       operator<<(long long __n)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:201:28: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'long long int'
  201 |       operator<<(long long __n)
      |                  ~~~~~~~~~~^~~
/usr/include/c++/10/ostream:205:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  205 |       operator<<(unsigned long long __n)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:205:37: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'long long unsigned int'
  205 |       operator<<(unsigned long long __n)
      |                  ~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/ostream:220:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(double) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  220 |       operator<<(double __f)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:220:25: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'double'
  220 |       operator<<(double __f)
      |                  ~~~~~~~^~~
/usr/include/c++/10/ostream:224:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(float) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  224 |       operator<<(float __f)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:224:24: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'float'
  224 |       operator<<(float __f)
      |                  ~~~~~~^~~
/usr/include/c++/10/ostream:232:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long double) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  232 |       operator<<(long double __f)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:232:30: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'long double'
  232 |       operator<<(long double __f)
      |                  ~~~~~~~~~~~~^~~
/usr/include/c++/10/ostream:245:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(const void*) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  245 |       operator<<(const void* __p)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:245:30: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'const void*'
  245 |       operator<<(const void* __p)
      |                  ~~~~~~~~~~~~^~~
In file included from /usr/include/c++/10/ostream:784,
                 from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/bits/ostream.tcc:119:5: note: candidate: 'std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__streambuf_type*) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__streambuf_type = std::basic_streambuf<char>]'
  119 |     basic_ostream<_CharT, _Traits>::
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/10/bits/ostream.tcc:120:34: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'std::basic_ostream<char>::__streambuf_type*' {aka 'std::basic_streambuf<char>*'}
  120 |     operator<<(__streambuf_type* __sbin)
      |                ~~~~~~~~~~~~~~~~~~^~~~~~
In file included from ./DataBase.h:34,
                 from ./DataBase.cpp:8:
./DemtroysDatabase.h:71:15: note: candidate: 'std::ostream& operator<<(std::ostream&, const NodeMeasurePrimaryKey&)'
   71 | std::ostream &operator<<(std::ostream &o, const NodeMeasurePrimaryKey &pk);
      |               ^~~~~~~~
./DemtroysDatabase.h:71:72: note:   no known conversion for argument 2 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'const NodeMeasurePrimaryKey&'
   71 | std::ostream &operator<<(std::ostream &o, const NodeMeasurePrimaryKey &pk);
      |                                           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
In file included from /usr/local/include/Poco/Data/Statement.h:26,
                 from /usr/local/include/Poco/Data/Session.h:23,
                 from /usr/local/include/Poco/Data/SessionFactory.h:23,
                 from ./DataBase.h:22,
                 from ./DataBase.cpp:8:
/usr/local/include/Poco/Data/Row.h:236:24: note: candidate: 'std::ostream& Poco::Data::operator<<(std::ostream&, const Poco::Data::Row&)'
  236 | Data_API std::ostream& operator << (std::ostream &os, const Row& row);
      |                        ^~~~~~~~
/usr/local/include/Poco/Data/Row.h:236:66: note:   no known conversion for argument 2 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'const Poco::Data::Row&'
  236 | Data_API std::ostream& operator << (std::ostream &os, const Row& row);
      |                                                       ~~~~~~~~~~~^~~
In file included from ./DataBase.h:25,
                 from ./DataBase.cpp:8:
/usr/local/include/Poco/Data/RecordSet.h:505:31: note: candidate: 'std::ostream& Poco::Data::operator<<(std::ostream&, const Poco::Data::RecordSet&)'
  505 | inline Data_API std::ostream& operator << (std::ostream &os, const RecordSet& rs)
      |                               ^~~~~~~~
/usr/local/include/Poco/Data/RecordSet.h:505:79: note:   no known conversion for argument 2 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'const Poco::Data::RecordSet&'
  505 | inline Data_API std::ostream& operator << (std::ostream &os, const RecordSet& rs)
      |                                                              ~~~~~~~~~~~~~~~~~^~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from ./DataBase.h:12,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/bits/basic_string.h:6468:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)'
 6468 |     operator<<(basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/usr/include/c++/10/bits/basic_string.h:6468:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:72: note:   'Poco::Data::LOB<std::__cxx11::basic_string<char> >' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                                                                        ^
In file included from /usr/include/c++/10/mutex:42,
                 from ./DataBase.h:12,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/system_error:262:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::error_code&)'
  262 |     operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e)
      |     ^~~~~~~~
/usr/include/c++/10/system_error:262:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:71: note:   cannot convert 'Poco::Dynamic::Var::convert() const [with T = Poco::Data::LOB<std::__cxx11::basic_string<char> >]()' (type 'Poco::Data::LOB<std::__cxx11::basic_string<char> >') to type 'const std::error_code&'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
In file included from /usr/local/include/boost/detail/container_fwd.hpp:96,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/bitset:1540:5: note: candidate: 'template<class _CharT, class _Traits, long unsigned int _Nb> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::bitset<_Nb>&)'
 1540 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/usr/include/c++/10/bitset:1540:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:72: note:   'Poco::Data::LOB<std::__cxx11::basic_string<char> >' is not derived from 'const std::bitset<_Nb>'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                                                                        ^
In file included from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/ostream:506:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, _CharT)'
  506 |     operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
      |     ^~~~~~~~
/usr/include/c++/10/ostream:506:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:72: note:   deduced conflicting types for parameter '_CharT' ('char' and 'Poco::Data::LOB<std::__cxx11::basic_string<char> >')
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                                                                        ^
In file included from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/ostream:511:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, char)'
  511 |     operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
      |     ^~~~~~~~
/usr/include/c++/10/ostream:511:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:71: note:   cannot convert 'Poco::Dynamic::Var::convert() const [with T = Poco::Data::LOB<std::__cxx11::basic_string<char> >]()' (type 'Poco::Data::LOB<std::__cxx11::basic_string<char> >') to type 'char'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
In file included from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/ostream:517:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, char)'
  517 |     operator<<(basic_ostream<char, _Traits>& __out, char __c)
      |     ^~~~~~~~
/usr/include/c++/10/ostream:517:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:71: note:   cannot convert 'Poco::Dynamic::Var::convert() const [with T = Poco::Data::LOB<std::__cxx11::basic_string<char> >]()' (type 'Poco::Data::LOB<std::__cxx11::basic_string<char> >') to type 'char'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
In file included from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/ostream:523:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, signed char)'
  523 |     operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
      |     ^~~~~~~~
/usr/include/c++/10/ostream:523:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:71: note:   cannot convert 'Poco::Dynamic::Var::convert() const [with T = Poco::Data::LOB<std::__cxx11::basic_string<char> >]()' (type 'Poco::Data::LOB<std::__cxx11::basic_string<char> >') to type 'signed char'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
In file included from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/ostream:528:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, unsigned char)'
  528 |     operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
      |     ^~~~~~~~
/usr/include/c++/10/ostream:528:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:71: note:   cannot convert 'Poco::Dynamic::Var::convert() const [with T = Poco::Data::LOB<std::__cxx11::basic_string<char> >]()' (type 'Poco::Data::LOB<std::__cxx11::basic_string<char> >') to type 'unsigned char'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
In file included from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/ostream:589:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const _CharT*)'
  589 |     operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
      |     ^~~~~~~~
/usr/include/c++/10/ostream:589:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:72: note:   mismatched types 'const _CharT*' and 'Poco::Data::LOB<std::__cxx11::basic_string<char> >'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                                                                        ^
In file included from /usr/include/c++/10/ostream:784,
                 from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/bits/ostream.tcc:321:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const char*)'
  321 |     operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
      |     ^~~~~~~~
/usr/include/c++/10/bits/ostream.tcc:321:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:71: note:   cannot convert 'Poco::Dynamic::Var::convert() const [with T = Poco::Data::LOB<std::__cxx11::basic_string<char> >]()' (type 'Poco::Data::LOB<std::__cxx11::basic_string<char> >') to type 'const char*'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
In file included from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/ostream:606:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const char*)'
  606 |     operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
      |     ^~~~~~~~
/usr/include/c++/10/ostream:606:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:71: note:   cannot convert 'Poco::Dynamic::Var::convert() const [with T = Poco::Data::LOB<std::__cxx11::basic_string<char> >]()' (type 'Poco::Data::LOB<std::__cxx11::basic_string<char> >') to type 'const char*'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
In file included from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/ostream:619:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const signed char*)'
  619 |     operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
      |     ^~~~~~~~
/usr/include/c++/10/ostream:619:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:71: note:   cannot convert 'Poco::Dynamic::Var::convert() const [with T = Poco::Data::LOB<std::__cxx11::basic_string<char> >]()' (type 'Poco::Data::LOB<std::__cxx11::basic_string<char> >') to type 'const signed char*'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
In file included from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/ostream:624:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const unsigned char*)'
  624 |     operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
      |     ^~~~~~~~
/usr/include/c++/10/ostream:624:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:71: note:   cannot convert 'Poco::Dynamic::Var::convert() const [with T = Poco::Data::LOB<std::__cxx11::basic_string<char> >]()' (type 'Poco::Data::LOB<std::__cxx11::basic_string<char> >') to type 'const unsigned char*'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
In file included from /usr/include/c++/10/istream:39,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/ostream:773:5: note: candidate: 'template<class _Ostream, class _Tp> typename std::enable_if<std::__and_<std::__not_<std::is_lvalue_reference<_Tp> >, std::__is_convertible_to_basic_ostream<_Ostream>, std::__is_insertable<typename std::__is_convertible_to_basic_ostream<_Tp>::__ostream_type, const _Tp&, void> >::value, typename std::__is_convertible_to_basic_ostream<_Tp>::__ostream_type>::type std::operator<<(_Ostream&&, const _Tp&)'
  773 |     operator<<(_Ostream&& __os, const _Tp& __x)
      |     ^~~~~~~~
/usr/include/c++/10/ostream:773:5: note:   template argument deduction/substitution failed:
/usr/include/c++/10/ostream: In substitution of 'template<class _Ostream, class _Tp> typename std::enable_if<std::__and_<std::__not_<std::is_lvalue_reference<_Tp> >, std::__is_convertible_to_basic_ostream<_Ostream>, std::__is_insertable<typename std::__is_convertible_to_basic_ostream<_Tp>::__ostream_type, const _Tp&, void> >::value, typename std::__is_convertible_to_basic_ostream<_Tp>::__ostream_type>::type std::operator<<(_Ostream&&, const _Tp&) [with _Ostream = std::basic_ostream<char>&; _Tp = Poco::Data::LOB<std::__cxx11::basic_string<char> >]':
./DataBase.cpp:489:72:   required from here
/usr/include/c++/10/ostream:773:5: error: no type named 'type' in 'struct std::enable_if<false, std::basic_ostream<char>&>'
In file included from /usr/local/include/boost/detail/container_fwd.hpp:98,
                 from /usr/local/include/boost/container_hash/extensions.hpp:22,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/complex:554:5: note: candidate: 'template<class _Tp, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::complex<_Tp>&)'
  554 |     operator<<(basic_ostream<_CharT, _Traits>& __os, const complex<_Tp>& __x)
      |     ^~~~~~~~
/usr/include/c++/10/complex:554:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:72: note:   'Poco::Data::LOB<std::__cxx11::basic_string<char> >' is not derived from 'const std::complex<_Tp>'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                                                                        ^
In file included from /usr/include/c++/10/memory:84,
                 from /usr/local/include/boost/container_hash/extensions.hpp:36,
                 from /usr/local/include/boost/container_hash/hash.hpp:760,
                 from /usr/local/include/boost/type_index/stl_type_index.hpp:43,
                 from /usr/local/include/boost/type_index.hpp:29,
                 from /usr/local/include/boost/any.hpp:20,
                 from /usr/local/include/Wt/Dbo/SqlTraits:12,
                 from /usr/local/include/Wt/Dbo/ptr:11,
                 from /usr/local/include/Wt/Dbo/Types:10,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/bits/shared_ptr.h:69:5: note: candidate: 'template<class _Ch, class _Tr, class _Tp, __gnu_cxx::_Lock_policy _Lp> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__shared_ptr<_Tp, _Lp>&)'
   69 |     operator<<(std::basic_ostream<_Ch, _Tr>& __os,
      |     ^~~~~~~~
/usr/include/c++/10/bits/shared_ptr.h:69:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:72: note:   'Poco::Data::LOB<std::__cxx11::basic_string<char> >' is not derived from 'const std::__shared_ptr<_Tp, _Lp>'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                                                                        ^
In file included from /usr/local/include/boost/date_time/date_formatting.hpp:17,
                 from /usr/local/include/boost/date_time/gregorian/formatters.hpp:17,
                 from /usr/local/include/boost/date_time/gregorian/gregorian.hpp:25,
                 from /usr/local/include/boost/date_time/posix_time/time_formatters.hpp:12,
                 from /usr/local/include/boost/date_time/posix_time/posix_time.hpp:24,
                 from /usr/local/include/Wt/Dbo/StdSqlTraits:16,
                 from /usr/local/include/Wt/Dbo/Types:19,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/iomanip:79:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Resetiosflags)'
   79 |     operator<<(basic_ostream<_CharT, _Traits>& __os, _Resetiosflags __f)
      |     ^~~~~~~~
/usr/include/c++/10/iomanip:79:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:71: note:   cannot convert 'Poco::Dynamic::Var::convert() const [with T = Poco::Data::LOB<std::__cxx11::basic_string<char> >]()' (type 'Poco::Data::LOB<std::__cxx11::basic_string<char> >') to type 'std::_Resetiosflags'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
In file included from /usr/local/include/boost/date_time/date_formatting.hpp:17,
                 from /usr/local/include/boost/date_time/gregorian/formatters.hpp:17,
                 from /usr/local/include/boost/date_time/gregorian/gregorian.hpp:25,
                 from /usr/local/include/boost/date_time/posix_time/time_formatters.hpp:12,
                 from /usr/local/include/boost/date_time/posix_time/posix_time.hpp:24,
                 from /usr/local/include/Wt/Dbo/StdSqlTraits:16,
                 from /usr/local/include/Wt/Dbo/Types:19,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/iomanip:109:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setiosflags)'
  109 |     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setiosflags __f)
      |     ^~~~~~~~
/usr/include/c++/10/iomanip:109:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:71: note:   cannot convert 'Poco::Dynamic::Var::convert() const [with T = Poco::Data::LOB<std::__cxx11::basic_string<char> >]()' (type 'Poco::Data::LOB<std::__cxx11::basic_string<char> >') to type 'std::_Setiosflags'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
In file included from /usr/local/include/boost/date_time/date_formatting.hpp:17,
                 from /usr/local/include/boost/date_time/gregorian/formatters.hpp:17,
                 from /usr/local/include/boost/date_time/gregorian/gregorian.hpp:25,
                 from /usr/local/include/boost/date_time/posix_time/time_formatters.hpp:12,
                 from /usr/local/include/boost/date_time/posix_time/posix_time.hpp:24,
                 from /usr/local/include/Wt/Dbo/StdSqlTraits:16,
                 from /usr/local/include/Wt/Dbo/Types:19,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/iomanip:143:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setbase)'
  143 |     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setbase __f)
      |     ^~~~~~~~
/usr/include/c++/10/iomanip:143:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:71: note:   cannot convert 'Poco::Dynamic::Var::convert() const [with T = Poco::Data::LOB<std::__cxx11::basic_string<char> >]()' (type 'Poco::Data::LOB<std::__cxx11::basic_string<char> >') to type 'std::_Setbase'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
In file included from /usr/local/include/boost/date_time/date_formatting.hpp:17,
                 from /usr/local/include/boost/date_time/gregorian/formatters.hpp:17,
                 from /usr/local/include/boost/date_time/gregorian/gregorian.hpp:25,
                 from /usr/local/include/boost/date_time/posix_time/time_formatters.hpp:12,
                 from /usr/local/include/boost/date_time/posix_time/posix_time.hpp:24,
                 from /usr/local/include/Wt/Dbo/StdSqlTraits:16,
                 from /usr/local/include/Wt/Dbo/Types:19,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/iomanip:178:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setfill<_CharT>)'
  178 |     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setfill<_CharT> __f)
      |     ^~~~~~~~
/usr/include/c++/10/iomanip:178:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:72: note:   'Poco::Data::LOB<std::__cxx11::basic_string<char> >' is not derived from 'std::_Setfill<_CharT>'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                                                                        ^
In file included from /usr/local/include/boost/date_time/date_formatting.hpp:17,
                 from /usr/local/include/boost/date_time/gregorian/formatters.hpp:17,
                 from /usr/local/include/boost/date_time/gregorian/gregorian.hpp:25,
                 from /usr/local/include/boost/date_time/posix_time/time_formatters.hpp:12,
                 from /usr/local/include/boost/date_time/posix_time/posix_time.hpp:24,
                 from /usr/local/include/Wt/Dbo/StdSqlTraits:16,
                 from /usr/local/include/Wt/Dbo/Types:19,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/iomanip:208:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setprecision)'
  208 |     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setprecision __f)
      |     ^~~~~~~~
/usr/include/c++/10/iomanip:208:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:71: note:   cannot convert 'Poco::Dynamic::Var::convert() const [with T = Poco::Data::LOB<std::__cxx11::basic_string<char> >]()' (type 'Poco::Data::LOB<std::__cxx11::basic_string<char> >') to type 'std::_Setprecision'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
In file included from /usr/local/include/boost/date_time/date_formatting.hpp:17,
                 from /usr/local/include/boost/date_time/gregorian/formatters.hpp:17,
                 from /usr/local/include/boost/date_time/gregorian/gregorian.hpp:25,
                 from /usr/local/include/boost/date_time/posix_time/time_formatters.hpp:12,
                 from /usr/local/include/boost/date_time/posix_time/posix_time.hpp:24,
                 from /usr/local/include/Wt/Dbo/StdSqlTraits:16,
                 from /usr/local/include/Wt/Dbo/Types:19,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/iomanip:238:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setw)'
  238 |     operator<<(basic_ostream<_CharT, _Traits>& __os, _Setw __f)
      |     ^~~~~~~~
/usr/include/c++/10/iomanip:238:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:71: note:   cannot convert 'Poco::Dynamic::Var::convert() const [with T = Poco::Data::LOB<std::__cxx11::basic_string<char> >]()' (type 'Poco::Data::LOB<std::__cxx11::basic_string<char> >') to type 'std::_Setw'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
In file included from /usr/local/include/boost/date_time/date_formatting.hpp:17,
                 from /usr/local/include/boost/date_time/gregorian/formatters.hpp:17,
                 from /usr/local/include/boost/date_time/gregorian/gregorian.hpp:25,
                 from /usr/local/include/boost/date_time/posix_time/time_formatters.hpp:12,
                 from /usr/local/include/boost/date_time/posix_time/posix_time.hpp:24,
                 from /usr/local/include/Wt/Dbo/StdSqlTraits:16,
                 from /usr/local/include/Wt/Dbo/Types:19,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/iomanip:311:5: note: candidate: 'template<class _CharT, class _Traits, class _MoneyT> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Put_money<_MoneyT>)'
  311 |     operator<<(basic_ostream<_CharT, _Traits>& __os, _Put_money<_MoneyT> __f)
      |     ^~~~~~~~
/usr/include/c++/10/iomanip:311:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:72: note:   'Poco::Data::LOB<std::__cxx11::basic_string<char> >' is not derived from 'std::_Put_money<_MoneyT>'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                                                                        ^
In file included from /usr/local/include/boost/date_time/date_formatting.hpp:17,
                 from /usr/local/include/boost/date_time/gregorian/formatters.hpp:17,
                 from /usr/local/include/boost/date_time/gregorian/gregorian.hpp:25,
                 from /usr/local/include/boost/date_time/posix_time/time_formatters.hpp:12,
                 from /usr/local/include/boost/date_time/posix_time/posix_time.hpp:24,
                 from /usr/local/include/Wt/Dbo/StdSqlTraits:16,
                 from /usr/local/include/Wt/Dbo/Types:19,
                 from /usr/local/include/Wt/Dbo/Dbo:10,
                 from ./DataBase.h:15,
                 from ./DataBase.cpp:8:
/usr/include/c++/10/iomanip:363:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Put_time<_CharT>)'
  363 |     operator<<(basic_ostream<_CharT, _Traits>& __os, _Put_time<_CharT> __f)
      |     ^~~~~~~~
/usr/include/c++/10/iomanip:363:5: note:   template argument deduction/substitution failed:
./DataBase.cpp:489:72: note:   'Poco::Data::LOB<std::__cxx11::basic_string<char> >' is not derived from 'std::_Put_time<_CharT>'
  489 |    std::cout << rs.value("unit").convert<Poco::Data::LOB<std::string>>() << std::endl;
      |                                                                        ^
In file included from /usr/local/include/Poco/Data/AbstractBinder.h:29,
                 from /usr/local/include/Poco/Data/AbstractBinding.h:22,
                 from /usr/local/include/Poco/Data/StatementImpl.h:22,
                 from /usr/local/include/Poco/Data/Statement.h:22,
                 from /usr/local/include/Poco/Data/Session.h:23,
                 from /usr/local/include/Poco/Data/SessionFactory.h:23,
                 from ./DataBase.h:22,
                 from ./DataBase.cpp:8:
/usr/local/include/Poco/Dynamic/Var.h: In instantiation of 'T Poco::Dynamic::Var::convert() const [with T = Poco::Data::LOB<std::__cxx11::basic_string<char> >]':
./DataBase.cpp:489:72:   required from here
/usr/local/include/Poco/Dynamic/Var.h:173:19: error: no matching function for call to 'Poco::Dynamic::VarHolder::convert(Poco::Data::LOB<std::__cxx11::basic_string<char> >&)'
  173 |   pHolder->convert(result);
      |   ~~~~~~~~~~~~~~~~^~~~~~~~
In file included from /usr/local/include/Poco/Data/Date.h:22,
                 from /usr/local/include/Poco/Data/AbstractBinder.h:22,
                 from /usr/local/include/Poco/Data/AbstractBinding.h:22,
                 from /usr/local/include/Poco/Data/StatementImpl.h:22,
                 from /usr/local/include/Poco/Data/Statement.h:22,
                 from /usr/local/include/Poco/Data/Session.h:23,
                 from /usr/local/include/Poco/Data/SessionFactory.h:23,
                 from ./DataBase.h:22,
                 from ./DataBase.cpp:8:
/usr/local/include/Poco/Dynamic/VarHolder.h:466:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(Poco::Int8&) const'
  466 | inline void VarHolder::convert(Int8& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:466:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'Poco::Int8&' {aka 'signed char&'}
  466 | inline void VarHolder::convert(Int8& /*val*/) const
      |                                ^~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:472:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(Poco::Int16&) const'
  472 | inline void VarHolder::convert(Int16& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:472:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'Poco::Int16&' {aka 'short int&'}
  472 | inline void VarHolder::convert(Int16& /*val*/) const
      |                                ^~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:478:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(Poco::Int32&) const'
  478 | inline void VarHolder::convert(Int32& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:478:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'Poco::Int32&' {aka 'int&'}
  478 | inline void VarHolder::convert(Int32& /*val*/) const
      |                                ^~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:484:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(Poco::Int64&) const'
  484 | inline void VarHolder::convert(Int64& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:484:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'Poco::Int64&' {aka 'long int&'}
  484 | inline void VarHolder::convert(Int64& /*val*/) const
      |                                ^~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:490:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(Poco::UInt8&) const'
  490 | inline void VarHolder::convert(UInt8& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:490:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'Poco::UInt8&' {aka 'unsigned char&'}
  490 | inline void VarHolder::convert(UInt8& /*val*/) const
      |                                ^~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:496:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(Poco::UInt16&) const'
  496 | inline void VarHolder::convert(UInt16& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:496:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'Poco::UInt16&' {aka 'short unsigned int&'}
  496 | inline void VarHolder::convert(UInt16& /*val*/) const
      |                                ^~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:502:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(Poco::UInt32&) const'
  502 | inline void VarHolder::convert(UInt32& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:502:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'Poco::UInt32&' {aka 'unsigned int&'}
  502 | inline void VarHolder::convert(UInt32& /*val*/) const
      |                                ^~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:508:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(Poco::UInt64&) const'
  508 | inline void VarHolder::convert(UInt64& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:508:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'Poco::UInt64&' {aka 'long unsigned int&'}
  508 | inline void VarHolder::convert(UInt64& /*val*/) const
      |                                ^~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:514:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(Poco::DateTime&) const'
  514 | inline void VarHolder::convert(DateTime& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:514:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'Poco::DateTime&'
  514 | inline void VarHolder::convert(DateTime& /*val*/) const
      |                                ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:520:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(Poco::LocalDateTime&) const'
  520 | inline void VarHolder::convert(LocalDateTime& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:520:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'Poco::LocalDateTime&'
  520 | inline void VarHolder::convert(LocalDateTime& /*val*/) const
      |                                ^~~~~~~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:526:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(Poco::Timestamp&) const'
  526 | inline void VarHolder::convert(Timestamp& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:526:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'Poco::Timestamp&'
  526 | inline void VarHolder::convert(Timestamp& /*val*/) const
      |                                ^~~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:532:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(Poco::UUID&) const'
  532 | inline void VarHolder::convert(UUID& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:532:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'Poco::UUID&'
  532 | inline void VarHolder::convert(UUID& /*val*/) const
      |                                ^~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:560:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(long long int&) const'
  560 | inline void VarHolder::convert(long long& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:560:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'long long int&'
  560 | inline void VarHolder::convert(long long& /*val*/) const
      |                                ^~~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:566:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(long long unsigned int&) const'
  566 | inline void VarHolder::convert(unsigned long long& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:566:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'long long unsigned int&'
  566 | inline void VarHolder::convert(unsigned long long& /*val*/) const
      |                                ^~~~~~~~~~~~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:575:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(bool&) const'
  575 | inline void VarHolder::convert(bool& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:575:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'bool&'
  575 | inline void VarHolder::convert(bool& /*val*/) const
      |                                ^~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:581:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(float&) const'
  581 | inline void VarHolder::convert(float& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:581:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'float&'
  581 | inline void VarHolder::convert(float& /*val*/) const
      |                                ^~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:587:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(double&) const'
  587 | inline void VarHolder::convert(double& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:587:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'double&'
  587 | inline void VarHolder::convert(double& /*val*/) const
      |                                ^~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:593:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(char&) const'
  593 | inline void VarHolder::convert(char& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:593:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'char&'
  593 | inline void VarHolder::convert(char& /*val*/) const
      |                                ^~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:599:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(std::string&) const'
  599 | inline void VarHolder::convert(std::string& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:599:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'std::string&' {aka 'std::__cxx11::basic_string<char>&'}
  599 | inline void VarHolder::convert(std::string& /*val*/) const
      |                                ^~~~~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:605:13: note: candidate: 'virtual void Poco::Dynamic::VarHolder::convert(Poco::UTF16String&) const'
  605 | inline void VarHolder::convert(Poco::UTF16String& /*val*/) const
      |             ^~~~~~~~~
/usr/local/include/Poco/Dynamic/VarHolder.h:605:32: note:   no known conversion for argument 1 from 'Poco::Data::LOB<std::__cxx11::basic_string<char> >' to 'Poco::UTF16String&' {aka 'std::__cxx11::basic_string<short unsigned int, Poco::UTF16CharTraits>&'}
  605 | inline void VarHolder::convert(Poco::UTF16String& /*val*/) const
      |                                ^~~~~~~~~~~~~~~~~~

[utkarsh006]

• Refer to this DOCUMENTATION
• Refer this Youtube Tutorial