below is my code;these code works very fine until, the length of the field "content" exceeds 300000,
then  "segment fault" happened.
how can I avoid this?

               mysqlpp::Query query = conn.query();
               query << "select content from pages where id="<<id;
               mysqlpp::ResUse res = query.use();
               if (!res) {
                       std::cerr << "Result set is empty!" << std::endl;
                       return 1;
               }
               mysqlpp::Row r;
               while (r = res.fetch_row()) {
                       printf (r["content"]);
             }

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