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106 lines
2.8 KiB
C++
106 lines
2.8 KiB
C++
//
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// Copyright (c) 2019-2025 Ruben Perez Hidalgo (rubenperez038 at gmail dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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//[example_tutorial_sync
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/**
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* Creates a connection, establishes a session and
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* runs a simple "Hello world!" query.
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*
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* This example uses synchronous functions and handles errors using exceptions.
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*/
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#include <boost/mysql/any_connection.hpp>
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#include <boost/mysql/connect_params.hpp>
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#include <boost/mysql/error_with_diagnostics.hpp>
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#include <boost/mysql/results.hpp>
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#include <boost/asio/io_context.hpp>
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#include <iostream>
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//[tutorial_sync_namespaces
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namespace mysql = boost::mysql;
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namespace asio = boost::asio;
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//]
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void main_impl(int argc, char** argv)
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{
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if (argc != 4)
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{
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std::cerr << "Usage: " << argv[0] << " <username> <password> <server-hostname>\n";
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exit(1);
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}
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const char* hostname = argv[3];
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const char* username = argv[1];
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const char* password = argv[2];
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//[tutorial_sync_connection
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// The execution context, required to run I/O operations.
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asio::io_context ctx;
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// Represents a connection to the MySQL server.
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mysql::any_connection conn(ctx);
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//]
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//[tutorial_sync_main
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//[tutorial_sync_connect
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// The hostname, username and password to use
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mysql::connect_params params;
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params.server_address.emplace_host_and_port(hostname);
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params.username = username;
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params.password = password;
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// Connect to the server
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conn.connect(params);
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//]
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//[tutorial_sync_query
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// Issue the SQL query to the server
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const char* sql = "SELECT 'Hello world!'";
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mysql::results result;
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conn.execute(sql, result);
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//]
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//[tutorial_sync_results
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// Print the first field in the first row
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std::cout << result.rows().at(0).at(0) << std::endl;
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//]
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//[tutorial_sync_close
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// Close the connection
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conn.close();
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//]
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//]
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}
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int main(int argc, char** argv)
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{
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try
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{
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main_impl(argc, argv);
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}
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catch (const mysql::error_with_diagnostics& err)
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{
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// Some errors include additional diagnostics, like server-provided error messages.
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// Security note: diagnostics::server_message may contain user-supplied values (e.g. the
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// field value that caused the error) and is encoded using to the connection's character set
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// (UTF-8 by default). Treat is as untrusted input.
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std::cerr << "Error: " << err.what() << '\n'
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<< "Server diagnostics: " << err.get_diagnostics().server_message() << std::endl;
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return 1;
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}
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catch (const std::exception& err)
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{
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std::cerr << "Error: " << err.what() << std::endl;
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return 1;
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}
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}
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//]
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