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//
// Copyright (c) 2019-2023 Ruben Perez Hidalgo (rubenperez038 at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
//[tutorial_listing
#include <boost/mysql/error_with_diagnostics.hpp>
#include <boost/mysql/handshake_params.hpp>
#include <boost/mysql/results.hpp>
#include <boost/mysql/tcp_ssl.hpp>
#include <boost/asio/io_context.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/asio/ssl/context.hpp>
#include <boost/system/system_error.hpp>
#include <iostream>
#include <string>
/**
* For this example, we will be using the 'boost_mysql_examples' database.
* You can get this database by running db_setup.sql.
* This example assumes you are connecting to a localhost MySQL server.
*
* This example uses synchronous functions and handles errors using exceptions.
*/
void main_impl(int argc, char** argv)
{
if (argc != 4)
{
std::cerr << "Usage: " << argv[0] << " <username> <password> <server-hostname>\n";
exit(1);
}
//[tutorial_connection
// The execution context, required to run I/O operations.
boost::asio::io_context ctx;
// The SSL context, required to establish TLS connections.
// The default SSL options are good enough for us at this point.
boost::asio::ssl::context ssl_ctx(boost::asio::ssl::context::tls_client);
// Represents a connection to the MySQL server.
boost::mysql::tcp_ssl_connection conn(ctx.get_executor(), ssl_ctx);
//]
//[tutorial_connect
// Resolve the hostname to get a collection of endpoints
boost::asio::ip::tcp::resolver resolver(ctx.get_executor());
auto endpoints = resolver.resolve(argv[3], boost::mysql::default_port_string);
// The username, password and database to use
boost::mysql::handshake_params params(
argv[1], // username
argv[2], // password
"boost_mysql_examples" // database
);
// Connect to the server using the first endpoint returned by the resolver
conn.connect(*endpoints.begin(), params);
//]
//[tutorial_query
// Issue the SQL query to the server
const char* sql = "SELECT 'Hello world!'";
boost::mysql::results result;
conn.execute(sql, result);
//]
//[tutorial_results
// Print the first field in the first row
std::cout << result.rows().at(0).at(0) << std::endl;
//]
//[tutorial_close
// Close the connection
conn.close();
//]
}
int main(int argc, char** argv)
{
try
{
main_impl(argc, argv);
}
catch (const boost::mysql::error_with_diagnostics& err)
{
// Some errors include additional diagnostics, like server-provided error messages.
// Security note: diagnostics::server_message may contain user-supplied values (e.g. the
// field value that caused the error) and is encoded using to the connection's encoding
// (UTF-8 by default). Treat is as untrusted input.
std::cerr << "Error: " << err.what() << '\n'
<< "Server diagnostics: " << err.get_diagnostics().server_message() << std::endl;
return 1;
}
catch (const std::exception& err)
{
std::cerr << "Error: " << err.what() << std::endl;
return 1;
}
}
//]
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