linux mysql libmysqlcppconn select,update mysql

#include <chrono>
#include <cstring>
#include <ctime>
#include <fstream>
#include <iomanip>
#include <iomanip>
#include <iostream>
#include <memory>
#include <mutex>
#include <queue>
#include <random>
#include <sstream>
#include <thread>
#include <vector>
#include <cppconn/driver.h>
#include <cppconn/connection.h>
#include <cppconn/metadata.h>
#include <cppconn/parameter_metadata.h>
#include <cppconn/prepared_statement.h>
#include <cppconn/resultset.h>
#include <cppconn/resultset_metadata.h>
#include <cppconn/statement.h>

std::string get_time_now(bool is_exact = true)
{
    std::chrono::time_point<std::chrono::high_resolution_clock> now = std::chrono::high_resolution_clock::now();
    time_t raw_time = std::chrono::high_resolution_clock::to_time_t(now);
    struct tm tm_info = *localtime(&raw_time);
    std::stringstream ss;
    ss << std::put_time(&tm_info, "%Y%m%d%H%M%S");
    if (is_exact)
    {
        auto seconds = std::chrono::duration_cast<std::chrono::seconds>(now.time_since_epoch());
        auto mills = std::chrono::duration_cast<std::chrono::milliseconds>(now.time_since_epoch());
        auto micros = std::chrono::duration_cast<std::chrono::microseconds>(now.time_since_epoch());
        auto nanos = std::chrono::duration_cast<std::chrono::nanoseconds>(now.time_since_epoch());
        ss << "_" << (mills.count() - seconds.count() * 1000)
           << std::setfill('0') << std::setw(3) << (micros.count() - mills.count() * 1000)
           << std::setfill('0') << std::setw(3) << (nanos.count() - micros.count() * 1000);
    }
    return ss.str();
}

sql::Connection *conn;

sql::Connection *mysql_get_conn(const std::string &hostname_value = "localhost", const std::string &username_value = "rumination",
                                const std::string &password_value = "Rumination0001!", const std::string &dbname_value = "db",
                                const bool &isoptreconnect_value = true)
{
    try
    {
        sql::Driver *driver = get_driver_instance();
        conn = driver->connect(hostname_value, username_value, password_value);
        conn->setSchema(dbname_value);
        return conn;
    }
    catch (const std::exception &e)
    {
        std::stringstream ss;
        ss << "notify-send  'Connect mysql failed!' '";
        ss << e.what() << "!'";
        system(ss.str().c_str());
    }
    return conn;
}

sql::ResultSet *mysql_select_result(const std::string &select_str)
{
    sql::ResultSet *res;
    try
    {
        conn = mysql_get_conn();
        sql::Statement *stmt = conn->createStatement();
        res = stmt->executeQuery(select_str);
    }
    catch (const std::exception &e)
    {
        std::stringstream ss;
        ss << "notify-send  'get select result failed' '";
        ss << select_str << "!'";
        system(ss.str().c_str());
    }
    return res;
}

bool update_sql_result(const std::string &update_str)
{
    try
    {
        conn = mysql_get_conn();
        sql::Statement *stmt = conn->createStatement();
        return stmt->execute(update_str);
    }
    catch (const std::exception &e)
    {
        std::stringstream ss;
        ss << "notify-send  'update failed' '";
        ss << update_str << "!'";
        system(ss.str().c_str());
        return true;
    }
    return true;
}

void mysql_get_conn_demo()
{

    sql::Connection *conn = mysql_get_conn();
    std::cout << std::boolalpha << "conn->isValid():" << conn->isValid() << std::endl;
}

void mysql_select_demo()
{
    std::string select_str = "select * from t3 limit 10;";
    sql::ResultSet *res = mysql_select_result(select_str);
    sql::ResultSetMetaData *res_metadata = res->getMetaData();

    int rows_count = res->rowsCount();
    int cols_count = res_metadata->getColumnCount();
    std::cout << "Rows count " << rows_count << ",columns count:" << cols_count << std::endl;
    while (res->next())
    {
        for (int j = 1; j < cols_count; j++)
        {
            std::cout << res->getString(j) << "\t";
        }
        std::cout << res->getString(cols_count) << std::endl;
    }
    res->close();
    std::cout << get_time_now() << ",thread id:" << std::this_thread::get_id() << std::endl;
}

void mysql_update_demo()
{
    std::stringstream ss;
    ss << "update t3 set author='"
       << "aaa"
       << "' where id=1;";
    bool is_succeed = update_sql_result(ss.str());
    if (!is_succeed)
    {
        std::cout << ss.str() << " execute successfully!" << std::endl;
    }
    else
    {
        std::cout << ss.str() << " execute failed!" << std::endl;
    }
    std::cout << get_time_now() << ",thread id:" << std::this_thread::get_id();
}

int main(int args, char **argv)
{
    // g++-13 -g -std=c++23 -I. main.cpp -lmysqlcppconn -luuid -pthread -o h1;
    mysql_select_demo();

    if (conn->isValid())
    {
        conn->close();
    }

    std::cout << get_time_now() << ",finished id: " << std::this_thread::get_id() << " of " << __LINE__ << " in " << __FUNCTION__ << std::endl;
}

Compile

g++-13 -g -std=c++23 -I. main.cpp -lmysqlcppconn -luuid -pthread -o h1;

Run

./h1;