[odb-users] error during linking process for hello world example with sqlite database

[Teererai Marange]

Thanks for the quick response, however I have encountered another issue.
When I perform the linking once again with the command:

 g++ -o driver driver.o person-odb.o -lodb-sqlite -lodb -L\usr\local\lib

The following error is returned:

driver.o: In function `main':
driver.cpp:(.text+0x76): undefined reference to `person::person(std::string
const&, std::string const&, unsigned short)'
driver.cpp:(.text+0x110): undefined reference to
`person::person(std::string const&, std::string const&, unsigned short)'
driver.cpp:(.text+0x1b3): undefined reference to
`person::person(std::string const&, std::string const&, unsigned short)'
collect2: error: ld returned 1 exit status

The code for driver.cpp is shown below:


// driver.cpp
//

#include <memory>   // std::auto_ptr
#include <iostream>

#include <odb/database.hxx>
#include <odb/transaction.hxx>

#include <odb/sqlite/database.hxx>

#include "person.hpp"
#include "person-odb.hxx"

using namespace std;
using namespace odb::core;

int
main (int argc, char* argv[])
{
      person john ("John", "Doe", 33);
      person jane ("Jane", "Doe", 32);
      person joe ("Joe", "Dirt", 30);

      transaction t (db->begin ());

      // Make objects persistent and save their ids for later use.
      //
      john_id = db->persist (john);
      jane_id = db->persist (jane);
      joe_id = db->persist (joe);

      t.commit ();
    }
  }
  catch (const odb::exception& e)
  {
    cerr << e.what () << endl;
    return 1;
  }
}

person.hpp is shown below:


// person.hpp
//
#ifndef PERSON_HPP
#define PERSON_HPP

#include <string>
#include <odb/core.hxx>

#pragma db object
class person
{
public:
  person (const std::string& first,
          const std::string& last,
          unsigned short age);

  const std::string& first () const;
  const std::string& last () const;

  unsigned short age () const;
  void age (unsigned short);

private:
  person(){};

  friend class odb::access;

  #pragma db id auto
  unsigned long id_;
  std::string first_;
  std::string last_;
  unsigned short age_;
};

#endif

I am new to linking in general so any assistance would be appreciated.




On Thu, Jun 25, 2015 at 6:04 AM, Alexandre Pretyman <
alexandre.pretyman at gmail.com> wrote:

> You seem to be missing the argument to tell the linker to actually look in /usr/local/lib:
> -L/usr/local/lib -lodb-mysql
>
> For more information, you can follow this link: http://bfy.tw/V1d =)
>
> On 24 June 2015 at 11:52, Teererai Marange <selection989 at gmail.com> wrote:
>
>> In attempting to get the hello world example program from the
>> documentation
>> to work, I am failing to link the application using the following command
>> entered in terminal:
>>
>>  g++ -o driver driver.o person-odb.o -L/usr/local/lib/
>> libodb-sqlite-2.4.so
>> -lodb-mysql -lodb
>>
>> The following error is returned by terminal:
>>
>> /usr/bin/ld: cannot find -lodb-mysql
>> collect2: error: ld returned 1 exit status
>>
>> Upon installation of libodb-sqlite-2.4, I was informed that the libraries
>> were located in /usr/local/lib and can confirm that the shared objects do
>> indeed exist there. In addition to this, I am using libodb-2.4 and am
>> using
>> g++ version 4.8.
>>
>>
>>
>> --
>> Regards,
>>
>> Teererai Marange
>>
>
>
>
> --
> Alexandre Pretyman
>



-- 
Regards,

Teererai Marange
Ph: 021521987