如何在c ++中超时mysql ++查询

#include<mysql++.h>
#include<chrono>
#include<thread>

int main() {
    // 创建MySQL++连接
    mysqlpp::Connection conn(false);
    if (conn.connect("hostname", "username", "password", "database")) {
        // 创建查询
        mysqlpp::Query query = conn.query("SELECT * FROM table_name");

        // 设置查询超时时间
        std::chrono::milliseconds timeout(5000); // 5秒超时

        // 开始查询
        auto start_time = std::chrono::high_resolution_clock::now();
        mysqlpp::StoreQueryResult result = query.store();

        // 循环检查查询是否完成，并睡眠100毫秒
        while (!result && std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::high_resolution_clock::now() - start_time).count()< timeout.count()) {
            std::this_thread::sleep_for(std::chrono::milliseconds(100));
            result = query.store();
        }

        // 如果查询超时，则取消查询
        if (!result) {
            query.cancel();
            std::cout << "Query timed out."<< std::endl;
        } else {
            // 处理查询结果
            // ...
        }
    } else {
        std::cout << "Failed to connect to database."<< std::endl;
    }

    return 0;
}