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index.js
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index.js
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var fs = require('fs');
var mysql = require('mysql');
var express = require('express');
var app = express();
var port = 8888;
var server = app.listen(port, function() {
console.log('Listening on port: ' + port);
});
var connection ;
var readFile ;
var testData = [
{
"firstName": "John",
"lastName": "Smith",
"age": 25,
"address":{
"streetAddress": "21 2nd Street",
"city": "New York",
"state": "NY",
"postalCode": "10021"
}
},
{
"firstName": "Jutatip",
"lastName": "Marirak",
"age": 22,
"address":{
"streetAddress": "Bangna-Trad",
"city": "Bangplee",
"state": "Samutprakarn",
"postalCode": "10540"
}
}
];
app.get('/', function(req, res) {
res.sendFile(__dirname + '/index.html');
});
app.get('/hi', function(req, res) {
res.sendFile(__dirname + '/index.html');
var name = req.param.name;
res.send("My id :"+ name);
});
// text file : [object object] but cannot read file
// fs.writeFile('txtFile.txt', testData, function(err) {
// if (err) throw err;
// console.log('text file saved!');
// console.log('-----------------------');
// });
//text file : correct data
function writeFile(){
fs.writeFile('txtFile.txt', JSON.stringify(testData), function(err) {
if (err) throw err;
console.log('-----------Save to text file------------');
});
}
// log : number
// fs.readFile('txtFile.txt',function(err, data) {
// if (err) throw err;
// console.log(data);
// console.log('-----------------------');
// console.log('text file read!');
// });
// log : correct data
function readData(){
fs.readFile('txtFile.txt',function(err, data) {
if (err) throw err;
readFile = JSON.parse(data);
console.log('-----------Read from txt file------------');
console.log(JSON.parse(data));
// insertData();
selectData();
// retrieveData();
});
}
function connectdb(){
connection = mysql.createConnection({
host: 'localhost',
user: 'root',
password: '',
database: 'test'
});
connection.connect(function(err) {
if (err) throw err;
// console.log("Connected!");
});
}
function insertData(){
connectdb();
for(var i=0; i<readFile.length; i++){
var firstName = readFile[i].firstName;
var lastName = readFile[i].lastName;
var age = readFile[i].age;
var address = JSON.stringify(readFile[i].address);
var sql = "INSERT INTO tb_username (firstName, lastName, age, address) VALUES ('"+firstName+"','"+lastName+"','"+age+"','"+address+"')";
connection.query(sql, function (err, result) {
if (err) throw err;
});
}
connection.end();
}
function selectData(){
connectdb();
// var sql = "SELECT * FROM tb_username WHERE firstName = 'Jutatip'";
var sql = "SELECT * FROM tb_username";
connection.query(sql, function (err, result, fields) {
if(err) throw err;
console.log('------------Select from DB-----------');
// console.log(result);
for(var i=0; i<result.length; i++){
console.log("FirstName : "+result[i].firstName);
console.log("LastName : "+result[i].lastName);
console.log("Age : "+result[i].age);
console.log("Address : "+result[i].address);
}
});
connection.end();
}
function retrieveData(){
connectdb();
var sql = "SELECT * FROM tb_username";
var retrieveData = [];
connection.query(sql, function (err, result, fields) {
if(err) throw err;
console.log('------------Retrieve from DB-----------');
// console.log(result);
for(var i=0; i<result.length; i++){
retrieveData.push('{"firstName":"'+result[i].firstName+'", "lastName":"'+result[i].lastName+'","age":'+result[i].age+',"address":'+result[i].address+'}');
}
console.log("Retrieved data : "+retrieveData);
});
connection.end();
}