William Carroll dfe23e3b63 Add instruction for operating the server

Add some basic commands for working with the server from within `ghci`, which is
helpful when developing.

2020-07-27 11:36:09 +01:00

TopTal take-home #2

All of the commands defined herein should be run from the top-level directory of this repository (i.e. the directory in which this file exists).

Server

To create the environment that contains all of this application's dependencies, run:

$ nix-shell

To run the server interactively, run:

$ cd src/
$ ghci

Now compile and load the server with:

Prelude> :l Main.hs
*Main> main

Create a new database named db.sqlite3 with:

$ sqlite3 db.sqlite3

Initialize the schema with:

sqlite> .read src/init.sql

You can verify that you successfully initialized the database by running:

sqlite> .tables
sqlite> .schema Accounts
sqlite> .schema Trips

Populate the database with some dummy values using the following:

sqlite> PRAGMA foreign_keys = on;
sqlite> .mode csv
sqlite> .import data/accounts.csv Accounts
sqlite> .import data/trips.csv Trips

You can verify you successfully populated the tables with:

sqlite> .mode columns
sqlite> .headers on
sqlite> SELECT * FROM Accounts;
sqlite> SELECT * FROM Trips;