ARCXX

ARCXX is an Open Source C++20 O/R mapper of Active Record pattern.

Here is a simple Model definition example. There are no magic macros in this library.

struct User : public arcxx::model<User> {
    static constexpr auto table_name = "user_table";

    struct ID : public arcxx::attributes::integer<User, ID, std::size_t> {
        static constexpr auto column_name = "id";
        using integer<User, ID, size_t>::integer;

        inline static const auto constraints = primary_key;
    } id;

    struct Name : public arcxx::attributes::string<User, Name> {
        static constexpr auto column_name = "name";
        using string<User, Name>::string;

        inline static const auto constraints = default_value("unknow") & length(128);
    } name;
};

To get data, there are no SQL statements.

const auto find_users_query = User::where(User::ID::between(0,10));

The below example is how to create a user table and insert new data into a database.

auto connector = arcxx::sqlite3::adaptor::open("test.sqlite3");
if (connector.has_error()){
    // connection error handling
    std::cout << connector.error_message() << std::endl;
}

/*
 * CREATE TABLE members_table(
 *   id INTEGER PRIMARY KEY,
 *   name VARCHAR(128) DEFAULT 'unknown' NOT NULL
 * );
 */
const tl::expected<void, std::string> result = connector.create_table<User>();
if (!result){
    // print error
    std::cout << result.error() << std::endl;
}

const tl::expected<void, std::string> result = User::insert(User{ .id=1, .name="foo" }).exec(connector);
if (!result){
    // print inserting error
    std::cout << result.error() << std::endl;
}

connector.close();

Install

Have a look at the Installation document to build and install ARCXX.

Documentation

See below documentation. English is full documentation. Also, Japanese is available.

• English
• Japanese

Developing Status

Completed

• SQLite3 support
• PostgreSQL support

WIP

• Documentation
• Translation of documents
• Tests
• Example codes
• std::range like access

Waiting

• Public Relations

License

This software is released under the MIT License, see LICENSE.

ARCXX depends on third party libraries. To use these subcomponents is subject to the terms and conditions of the following licenses.

• libsqlite3 (https://www.sqlite.org/copyright.html)
• libpq (https://www.postgresql.org/about/licence/)
• tl::expected (https://github.com/TartanLlama/expected)