从mysql连接器C ++ API获取当前连接

Question

Im using the mysql connector c++ api and I made, that my program connect to the database after I execute it.

But now I have to do querys on other cpp files.

Should I open a new connection and close it every time I do a query or should I keep that one connection?

And if its better to keep one connection, then how can I get the current connection on other cpp files?

main on 1.cpp

int AuthServerMain(int argc, _TCHAR* argv[])
{
    sql::mysql::MySQL_Driver *driver;
    sql::Connection * con;
    driver = sql::mysql::get_mysql_driver_instance();
    con = driver->connect("tcp://ip:3306", "root", "password");
    con->setSchema("dbo");
}

now my problem is the "con"

if I write on 2.cpp

sql::Statement * stmt;
sql::ResultSet * resset;
stmt = con->createStatement();

then "con" is red underlined because he cant find it. How can I do that he can find "con"?

Answer 1

Why would you not make a database class, which has the connection varaible inside it. Then you could just pass this class around the .cpp files where you need it. You could make a function like database::excetute(std::string s) or even overload the << operator , so your code in the other .cpp files are clean.