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From:Nick Hastings Date:July 24 2008 8:26am
Subject:Re: Connections using MultiResultsOption
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Hi all,
* Warren Young <mysqlpp@stripped> [080724 16:44]:

>> However now I want to use mysql procedures in my queries so I added
>> c.set_option(new mysqlpp::MultiResultsOption( true ) );
>> before tue c.connect() call. However, after doing this I found
>> that I am unable to connect to the database unless I explicitly define
>> all of server, user, password (and maybe port).
> I don't see why that would be the case.  Options are processed  
> immediately in set_option(), and they don't affect the connect() call's 
> behavior.

Hmm strange.

> I suggest that you enable (and catch) exceptions, since they can  
> indicate problems better, and get the problem distilled down to a single 
> line's difference: a program that connects fine with the default options 
> when the MultiResultsOption line is commented out, and fails with it 
> enabled.  You may want to do this to one of the examples, rather than to 
> your own program, because they're known to be correct.

Actually, except for the exceptions, I'd already done this.

> If it still fails in that case, post the text of any exceptions you get.

Here it is with exception handling.

#include "mysql++.h"
int main(int argc, char *argv[])
        const char* db = "connectfail";
        const char* server = 0;
        const char* user = 0;
        const char* password = 0;
        unsigned int port = 0;

        if ( argc > 2 ) {
                std::cout << "Explicitly setting varaiables." << std::endl;
                server = "localhost";
                user = "hastings";
                password = "foobar";
                port = 3306;
        try {
                mysqlpp::Connection c(true);
                if ( argc > 1 ) {
                        std::cout << "Setting MultiResultsOption" <<
                        c.set_option(new mysqlpp::MultiResultsOption(true));
                c.connect( db, server, user,  password, port );
        catch (const mysqlpp::Exception& er) {
                std::cerr << "Error: " << er.what() << std::endl;
        std::cout << "Connected ok." << std::endl;

Here is a transcript from my shell:
% mysqladmin create connectfail
% g++ -o connectfail -I/usr/include/mysql++ -I/usr/include/mysql -lmysqlpp
$ ./connectfail
Connected ok.
$ ./connectfail foo
Setting MultiResultsOption
Error: Access denied for user 'hastings'@'localhost' (using password: NO)
$ ./connectfail foo bar
Explicitly setting varaiables.
Setting MultiResultsOption
Connected ok.

I also ran the above under strace, and it seems that .my.cnf is never
read when MultiResultsOption is not set.

I wonder if anyone can reproduce this?

Thanks again,

Connections using MultiResultsOptionNick Hastings24 Jul
  • Re: Connections using MultiResultsOptionWarren Young24 Jul
    • Re: Connections using MultiResultsOptionNick Hastings24 Jul
      • Re: Connections using MultiResultsOptionNick Hastings25 Jul
        • Re: Connections using MultiResultsOptionWarren Young27 Nov
          • Re: Connections using MultiResultsOptionNick Hastings27 Nov