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//
// Copyright (c) 2019-2025 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)
//
//[example_source_script
#include <boost/mysql/error_with_diagnostics.hpp>
#include <boost/mysql/execution_state.hpp>
#include <boost/mysql/handshake_params.hpp>
#include <boost/mysql/metadata_collection_view.hpp>
#include <boost/mysql/metadata_mode.hpp>
#include <boost/mysql/row_view.hpp>
#include <boost/mysql/rows_view.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 <fstream>
#include <iostream>
#include <stdexcept>
#include <string>
/**
* This example runs all command in a .sql file, using multi-queries.
* Note that special commands that are handled by the mysql command line tool
* (like DELIMITER) won't work.
*
* 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.
*/
// Reads a file into memory
std::string read_file(const char* file_name)
{
std::ifstream ifs(file_name);
if (!ifs)
throw std::runtime_error("Cannot open file: " + std::string(file_name));
return std::string(std::istreambuf_iterator<char>(ifs), std::istreambuf_iterator<char>());
}
void print_column_names(boost::mysql::metadata_collection_view meta_collection)
{
if (meta_collection.empty())
return;
bool is_first = true;
for (auto meta : meta_collection)
{
if (!is_first)
{
std::cout << " | ";
}
is_first = false;
std::cout << meta.column_name();
}
std::cout << "\n-----------------\n";
}
void print_row(boost::mysql::row_view row)
{
bool is_first = true;
for (auto field : row)
{
if (!is_first)
{
std::cout << " | ";
}
is_first = false;
std::cout << field;
}
std::cout << '\n';
}
void print_ok(const boost::mysql::execution_state& st)
{
std::cout << "Affected rows: " << st.affected_rows()
<< "\n"
"Last insert ID: "
<< st.last_insert_id()
<< "\n"
"Warnings: "
<< st.warning_count() << "\n\n"
<< std::flush;
}
void main_impl(int argc, char** argv)
{
if (argc != 5)
{
std::cerr << "Usage: " << argv[0] << " <username> <password> <server-hostname> <path-to-script>\n";
exit(1);
}
// Read the script file into memory
std::string script_contents = read_file(argv[4]);
// Set up the io_context, SSL context and connection required to
// connect to the server.
boost::asio::io_context ctx;
boost::asio::ssl::context ssl_ctx(boost::asio::ssl::context::tls_client);
boost::mysql::tcp_ssl_connection conn(ctx.get_executor(), ssl_ctx);
// Resolve the server 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
);
// We're going to use multi-queries, which enables passing the server
// a set of semicolon-separated queries. We need to explicitly enable support for it.
params.set_multi_queries(true);
// We'll be using metadata strings to print column names, so we need to enable support for it
conn.set_meta_mode(boost::mysql::metadata_mode::full);
// Connect to the server using the first endpoint returned by the resolver
conn.connect(*endpoints.begin(), params);
// The executed commands may generate a lot of output, so we're going to
// use multi-function operations (i.e. start_execution) to read it in batches.
boost::mysql::execution_state st;
conn.start_execution(script_contents, st);
// The main read loop. Each executed command will yield a resultset.
// st.comoplete() returns true once all resultsets have been read.
for (std::size_t resultset_number = 0; !st.complete(); ++resultset_number)
{
// Advance to next resultset, if required
if (st.should_read_head())
{
conn.read_resultset_head(st);
}
// Print the name of the fields
std::cout << "Resultset number " << resultset_number << "\n";
print_column_names(st.meta());
// Read the rows and print them
while (st.should_read_rows())
{
boost::mysql::rows_view batch = conn.read_some_rows(st);
for (auto row : batch)
{
print_row(row);
}
}
// Print OK packet data
print_ok(st);
}
// 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 character set
// (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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