man mysql

--default-character-set=charset_nameUse charset_name as the default character set for the client and connection.A common issue that can occur when the operating system uses utf8 or another multi-byte character set isthat output from the mysql client is formatted incorrectly, due to the fact that the MySQL client uses thelatin1 character set by default. You can usually fix such issues by using this option to force the clientto use the system character set instead.See Section 10.5, “Character Set Configuration”, for more information.

    // register MySQL connector
    Poco::Data::MySQL::Connector::registerConnector();// create a sessionSession session(SessionFactory::instance().create("MySQL", "user=root;password=888;db=test"));

Poco::AutoPtr<Poco::Data::SessionImpl> Connector::createSession(const std::string& connectionString)
{return Poco::AutoPtr<Poco::Data::SessionImpl>(new SessionImpl(connectionString));
}

std::map<std::string, std::string> options;

//// Options//
if (options["compress"] == "true"){_mysql.options(MYSQL_OPT_COMPRESS);}else if (options["compress"] == "false"){// do nothing
    }else if (options["compress"] != ""){throw MySQLException("create session: specify correct compress option (true or false) or skip it");}

_mysql.options(MYSQL_OPT_COMPRESS);

SessionHandle _mysql;

void SessionHandle::options(mysql_option opt)
{int res = mysql_options(h, opt, 0);if (res != 0){throw ConnectionException("mysql_options error", h);}
}void SessionHandle::options(mysql_option opt, bool b)
{my_bool tmp = b;int res = mysql_options(h, opt, &tmp);if (res != 0){throw ConnectionException("mysql_options error", h);}
}

MYSQL_OPT_COMPRESS (argument: not used) 

 MYSQL_SET_CHARSET_NAME (argument type: char *)The name of the character set to use as the default character set. 

void SessionHandle::options(mysql_option opt)void SessionHandle::options(mysql_option opt, bool b)

MYSQL mysql;mysql_init(&mysql);
mysql_options(&mysql,MYSQL_OPT_COMPRESS,0);
mysql_options(&mysql,MYSQL_READ_DEFAULT_GROUP,"odbc");
mysql_options(&mysql,MYSQL_INIT_COMMAND,"SET autocommit=0");
if (!mysql_real_connect(&mysql,"host","user","passwd","database",0,NULL,0))
{fprintf(stderr, "Failed to connect to database: Error: %s\n",mysql_error(&mysql));
}

void options(mysql_option opt, char *c);

void SessionHandle::options(mysql_option opt, char *c)
{int res = mysql_options(h, opt, c);if (res != 0){throw ConnectionException("mysql_options error", h);}
}

//
// Real connect
//

if (options["default-character-set"] != "")
{_mysql.options(MYSQL_SET_CHARSET_NAME, options["default-character-set"].c_str());
}

    // register MySQL connector
    Poco::Data::MySQL::Connector::registerConnector();// create a session//Session session("user=root;password=888;db=test");Session session(SessionFactory::instance().create("MySQL", "user=root;password=888;db=test;default-character-set=utf8"));