C++ / mysql Connector - undefined reference to get_driver_instance - already tried the easy stuff

Question

Yes this question has been asked before ... I've tried everything mentioned in the previous answers. My setup is really straightforward so this shouldn't be so hard.

I just want to program against mysql using C++. My source code is taken verbatem from the 'hello world' type example here:

http://dev.mysql.com/doc/refman/5.1/en/connector-cpp-examples-complete-example-1.html

I am on Ubuntu 12.10. I am trying:

g++ -Wall -o firsttry_prog -I/usr/include/mysqlcppconn -I/usr/local/boost_1_53_0  -L/usr/lib/x86_64-linux-gnu -l:libmysqlclient_r.so.18 -L/usr/lib/mysqlcppconn -lmysqlcppconn  firsttry.cpp

It compiles (if I use -c option) but won't build, giving me the infamous:

/tmp/ccn768hj.o: In function `main':
firsttry.cpp:(.text+0x3a): undefined reference to `get_driver_instance'

A few details:

• 'firsttry.cpp' is just what I named the source code file, again taken verbatem from the official example
• As you can see I AM linking in the mysqlclient library and the mysqlcppconn library. Many times when this question has been asked previously, the answer was to link those.
• Some other historical answers suggest the sample source code is wrong and that the function in question needs to be in the sql::mysql namespace etc. I am pretty sure the source code is fine. Again, it compiles, and changing the namespaces in the source code just seems to make it worse.

Thank you in advance for any help you can provide.

Answer 1

So I have now had this problem for a week now and I became very frustrated with it as well. I just now was able to finally build a program that does nothing except login to mysql and I literally squealed with joy. Here is what I have and I hope it helps.

I first compiled the c++ connector library from source but after a while I thought maybe I did something wrong so I then just used apt to get it with:

sudo apt-get install  libmysqlcppconn-dev

And here is my simple tester source file "tester.cpp"

#include <stdlib.h>
#include <iostream>
#include <mysql_connection.h>
#include <driver.h>
#include <exception.h>
#include <resultset.h>
#include <statement.h>

using namespace sql;
int main(void){
  sql::Driver *driver;
  sql::Connection *con;

  driver = get_driver_instance();
  con = driver->connect("tcp://127.0.0.1:3306","root","YOURPASSWORD");

  return 0;
}

And finally g++ compile command:

sudo g++ -Wall -I/usr/include/cppconn -o testapp tester.cpp -L/usr/lib -lmysqlcppconn

This worked for me and I hope it helps you solve your problem!