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csv.js
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csv.js
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//user prompts
const { on } = require('events');
const readline = require('readline');
//read csv
const fs = require('fs');
const { parse } = require('csv-parse');
//insert csv into db
const sqlite3 = require("sqlite3").verbose();
const filepath = "./population.db";
//write csv
const { stringify } = require("csv-stringify");
doItAgain();
function doItAgain(){
const prompt = 'Press:\n1: for reading CSV\n2: for inserting CSV into sqlite3 DB\n3: for writing CSV from DB\n4: for a test CSV write\n5: to append test CSV\n6: to exit\n';
const r1 = readline.createInterface({
input: process.stdin,
output: process.stdout,
});
r1.question(prompt, userInput => {
switch(userInput) {
case '1':
readCSV();
break;
case '2':
insertCSVintoDB();
break;
case '3':
writeCSVfromDB();
break;
case '4':
testWrite();
break;
case '5':
appendTestCSV();
r1.close();
doItAgain();
break;
case '6':
testOut(userInput);
break;
default:
console.log('Didn\'t recognize input:', userInput);
r1.close();
doItAgain();
}
r1.close();
});
}
function appendTestCSV() {
const filename = "testWrite.csv";
const writableStream = fs.createWriteStream(filename, {flags: 'a'});
//sample CSV data
const d = new Date().toISOString();
const testMac = '7C-7A-91-8C-2A-80';
const testLat = 50.121592508766014;
const testLng = 8.671025307969714;
const testUnc = 33;
const stringifier = stringify({ delimiter: ',' });
stringifier.write([ d, testMac, testLat, testLng, testUnc ]);
stringifier.pipe(writableStream);
console.log("Finished appending test CSV data");
}
function testWrite() {
const filename = "testWrite.csv";
const writableStream = fs.createWriteStream(filename);
const columns = [
"timestamp",
"clientMac",
"latitude",
"longitude",
"uncertainty",
];
//sample CSV data
const d = new Date().toISOString();
const testMac = '7C-7A-91-8C-2A-80';
const testLat = 50.121592508766014;
const testLng = 8.671025307969714;
const testUnc = 33;
const stringifier = stringify({ header: true, columns: columns });
stringifier.write([ d, testMac, testLat, testLng, testUnc ]);
stringifier.pipe(writableStream);
console.log("Finished inserting test CSV data");
}
function writeCSVfromDB() {
const filename = "saved_from_db.csv";
const writableStream = fs.createWriteStream(filename);
const columns = [
"year_month",
"month_of_release",
"passenger_type",
"direction",
"sex",
"age",
"estimate",
];
const db = connectToDatabase();
const stringifier = stringify({ header: true, columns: columns });
db.each(`select * from migration`, (error, row) => {
if (error) {
return console.log(error.message);
}
stringifier.write(row);
});
stringifier.pipe(writableStream);
console.log("Finished writing data");
}
function insertCSVintoDB() {
const db = connectToDatabase();
fs.createReadStream("./migration_data.csv")
.pipe(parse({ delimiter: ",", from_line: 2 }))
.on("data", function (row) {
db.serialize(function () {
db.run(
`INSERT INTO migration VALUES (?, ?, ? , ?, ?, ?, ?)`,
[row[0], row[1], row[2], row[3], row[4], row[5], row[6]],
function (error) {
if (error) {
return console.log(error.message);
}
console.log(`Inserted a row with the id: ${this.lastID}`);
}
);
});
});
}
function connectToDatabase() {
if (fs.existsSync(filepath)) {
return new sqlite3.Database(filepath);
} else {
const db = new sqlite3.Database(filepath, (error) => {
if (error) {
return console.error(error.message);
}
createTable(db);
console.log("Connected to the database successfully");
});
return db;
}
}
function createTable(db) {
db.exec(`
CREATE TABLE migration
(
year_month VARCHAR(10),
month_of_release VARCHAR(10),
passenger_type VARCHAR(50),
direction VARCHAR(20),
sex VARCHAR(10),
age VARCHAR(50),
estimate INT
)
`);
}
function readCSV() {
//reading csv file
fs.createReadStream("./migration_data.csv")
.pipe(parse({ delimiter: ",", from_line: 2 }))
.on("data", (row) => {
console.log(row);
})
.on("end", () => {
console.log("finished");
})
.on("error", (error) => {
console.log(error.message);
return;
});
}
function testOut(userInput) {
const d = new Date().toISOString();
console.log('this is what happens when you press', userInput, d);
}