Activout Database Client

Create a database client only by defining the C# interface you want. Uses Dapper for object mapping.

Create a Database Access Object (DAO) defining the C# interface you want and writing the SQL query. Shamelessly inspired by Jdbi Declarative API.

Rationale

The Activout Database Client provides a type-safe approach to make SQL requests to the database.

For the actual object mapping, Dapper is used but another implementation can be configured.

Example

Synchronous

public interface IUserDao
{
    [SqlUpdate("CREATE TABLE user (id INTEGER PRIMARY KEY, name VARCHAR)")]
    void CreateTable();

    [SqlUpdate("INSERT INTO user(id, name) VALUES (:id, :name)")]
    void InsertNamed([Bind("id")] int id, [Bind("name")] string name);

    [SqlUpdate("INSERT INTO user(id, name) VALUES (:id, :Name)")]
    void InsertObject([BindProperties] User user);

    [SqlUpdate("INSERT INTO user(id, name) VALUES (:user_id, :user_Name)")]
    void InsertObjectFull([BindProperties] User user);

    [SqlQuery("SELECT * FROM user ORDER BY name")]
    IEnumerable<User> ListUsers();

    [SqlQuery("SELECT * FROM user WHERE id = :id")]
    User GetUserById(int id);
}


_userDao = new DatabaseClientBuilder()
    .With(new DapperGateway(sqliteConnection))
    .Build<IUserDao>();

_userDao.CreateTable();
_userDao.InsertNamed(42, "foobar");
var user = _userDao.GetUserById(42);

Asynchronous

public interface IUserDaoAsync
{
    [SqlUpdate("CREATE TABLE user (id INTEGER PRIMARY KEY, name VARCHAR)")]
    Task CreateTable();

    [SqlUpdate("INSERT INTO user(id, name) VALUES (:id, :name)")]
    Task InsertNamed([Bind("id")] int id, [Bind("name")] string name);

    [SqlUpdate("INSERT INTO user(id, name) VALUES (:id, :Name)")]
    Task InsertObject([BindProperties] User user);

    [SqlUpdate("INSERT INTO user(id, name) VALUES (:user_id, :user_Name)")]
    Task InsertObjectFull([BindProperties] User user);

    [SqlQuery("SELECT * FROM user ORDER BY name")]
    Task<IEnumerable<User>> ListUsers();

    [SqlQuery("SELECT * FROM user WHERE id = :id")]
    Task<User> GetUserById(int id);
}


_userDao = new DatabaseClientBuilder()
    .With(new DapperGateway(sqliteConnection))
    .Build<IUserDaoAsync>();

await _userDao.CreateTable();
await _userDao.InsertNamed(42, null);
var user = await _userDao.GetUserById(42);

Public projects using Activout.DatabaseClient

• Your project here?

TODO

• Positional parameters, if anyone cares?
• Make it configurable whether : or @ is used to mark named parameters
• More real-life testing :)

Collaborate

This project is still under development - participation welcome!

Related projects

• Activout.RestClient - Create a REST(ish) API client only by defining the C# interface you want.

About Activout

Activout AB is a software company in Ronneby, Sweden.