LoRaWAN-Signal-Mapping/server/Repos.SQLite/ReadingRepo.mjs

"use strict";

class ReadingRepo {
	constructor({ database, RSSIRepo }) {
		this.db = database;
		this.RSSIRepo = RSSIRepo;
	}
	
	add(reading) {
		const statement = this.db.prepare(`INSERT INTO readings (
			id,
			latitude, longitude,
			data_rate, code_rate
		) VALUES (
			:id,
			:latitude,
			:longitude,
			:data_rate, :code_rate
		);`);
		
		let new_id = statement.run(reading).lastInsertRowid;
		
		// Attach the new id to the rssi objects
		for(let rssi of reading.rssis)
			rssi.reading_id = new_id;
		
		// Insert the RSSIs into the database
		this.RSSIRepo.add(...reading.rssis);
	}
	
	exists(id) {
		// Note that normally a count wouldn't be appropriate here just to test for existence, but it's ok because it's guaranteed that there will only ever be a single entry with a given id.
		let statement = this.db.prepare(`SELECT COUNT(id) AS count
		FROM readings
		WHERE id = :id`);
		
		let count = statement.get({ id }).count;
		
		return count > 0;
	}
	
	iterate_unreceived() {
		return this.db.prepare(`SELECT * FROM readings WHERE data_rate IS NULL;`).iterate();
	}
	
	iterate() {
		return this.db.prepare(`SELECT * FROM readings`).iterate();
	}
}

export default ReadingRepo;