applied-fp-course/level04

Level 04

We need a place to store our Comments/Topics, so we're going to add a database to our application, specifically the SQLite database. We've chosen SQLite because it was the simplest to have up and running for the purposes of the course.

There is an example module included for using PostgreSQL, however the course will focus on the SQLite implementation.

For reference, the packages we will use to talk to our database are:

• sqlite-simple
• sqlite-simple-errors

You will also need the SQLite database application installed and available on your system.

Also we will not necessarily provide all of the required imports any more, there may be other things you have to bring into scope.

The steps for this level:

1. src/FirstApp/DB/Types.hs
2. src/FirstApp/Types.hs
3. src/FirstApp/DB.hs
4. src/FirstApp/Main.hs

For the sake of simplicity, any configuration requirements will be hardcoded in FirstApp/Conf.hs for now. We will return to that in the next level.

NB: The PostgreSQL example module is in src/FirstApp/DB/PostgreSQL.hs.