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express.js
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express.js
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var express=require('express'),
mysql=require('mysql'),
credentials=require('./credentials.json'),
app = express(),
port = process.env.PORT || 1337;
credentials.database = "create_tables"
credentials.host='ids.morris.umn.edu'; //setup database credentials
var connection = mysql.createConnection(credentials); // setup the connection
connection.connect(function(err){if(err){console.log(err)}});
app.use(express.static(__dirname + '/public'));
app.get("/buttons",function(req,res){
var sql = 'SELECT * FROM till_buttons';
connection.query(sql,(function(res){return function(err,rows,fields){
var dbfarr = new Array(rows.length);
rows.forEach(function (item, index) {
dbfarr[index] = {"buttonID":item.button_id,
"left":item.leftPosition,
"top":item.topPosition,
"width":item.wide,
"label":item.label,
"invID":item.invID};
})
if(err){console.log("We have an error:");
console.log(err);}
res.send(dbfarr);
}})(res));
});
app.get("/user",function(req,res){
var sql = 'SELECT * FROM users';
connection.query(sql,(function(res){return function(err,rows,fields){
var dbfarr = new Array(rows.length);
rows.forEach(function (item, index) {
dbfarr[index] = {"user":item.username,
"id":item.id,
"left": (300 + index * 70).toString()};
})
if(err){console.log("We have an error:");
console.log(err);}
res.send(dbfarr);
console.log(dbfarr);
}})(res));
});
app.get("/max",function(req,res){
var sql = 'SELECT MAX(TransactionID) as max FROM till_items';
connection.query(sql,(function(res){return function(err,rows,fields){
var dbfarr = new Array(rows.length);
rows.forEach(function (item, index) {
dbfarr[index] = {"max":item.max};
})
if(err){console.log("We have an error:");
console.log(err);}
res.send(dbfarr);
console.log(dbfarr);
}})(res));
});
// Gets the button information form our transaction table and puts it in a table
app.get("/transaction",function(req,res){
// Setting up and making the SQL query
var sql = 'SELECT * FROM transactions';
connection.query(sql,(function(res){return function(err,rows,fields){
var dbfarr = new Array(rows.length);
// Loop over the response rows and put the information into an array of maps
// We can then use this to create our buttons
rows.forEach(function (item, index) {
dbfarr[index] = {
"buttonID":item.button_id,
"item_id":item.item_id,
"label":item.label,
"price" :item.price
}
});
if(err){
console.log("We have an error:");
console.log(err);
}
res.send(dbfarr);
}})(res));
});
app.get('/checkIfLoggedIn',function(req,res){
var sql = 'SELECT * FROM currentuser';
connection.query(sql,(function(res){
return function(err,rows,fields){
var numUsers = rows;
res.send(numUsers);
}
})(res));
});
//when a button is clicked the according item is put in transactions
app.get("/click",function(req,res){
var id = req.param('id');
var user = req.param('user');
console.log(user)
var params = [id, user]
//inserts the item which the button_id refers to into the transactions table
var sql = 'insert into transactions (button_id, label, invID, price, user, userid, timestamp) select x.button_id, x.label, x.invID, x.price, y.username, y.id, NOW() from till_buttons x, users y where x.button_id = ? and y.id = ?;'
//var sql = 'insert into transactions (button_id, label, invID, price, user, userid) select x.button_id, x.label, x.invID, x.price, y.user, y.userid from till_buttons x, user y where x.button_id =' ' and y.userid = ?;'
console.log("Attempting sql ->"+sql+"<-");
connection.query(sql, params,(function(res){return function(err,rows,fields){
if(err){console.log("We have an insertion error:");
console.log(err);
res.send(err);} else
{res.send("Successfully added button to transactions");} // Let the upstream guy know how it went
}})(res));
});
app.get("/addprevious",function(req,res){
var user = req.param('user');
var max = req.param('max');
console.log(user)
var params = [max, user]
//inserts the item which the button_id refers to into the transactions table
var sql = 'insert into till_items (button_id, label, invID, price, item_id, user, userid, timestamp, transactionID) select x.button_id, x.label, x.invID, x.price, x.item_id, x.user, x.userid, x.timestamp, ? from transactions x;'
//var sql = 'insert into transactions (button_id, label, invID, price, user, userid) select x.button_id, x.label, x.invID, x.price, y.user, y.userid from till_buttons x, user y where x.button_id =' ' and y.userid = ?;'
console.log("Attempting sql ->"+sql+"<-");
connection.query(sql, params,(function(res){return function(err,rows,fields){
if(err){console.log("We have an insertion error:");
console.log(err);
res.send(err);} else
{res.send("Successfully added to previous transactions");} // Let the upstream guy know how it went
}})(res));
});
app.get("/clickUser",function(req,res){
var id = req.param('id');
//inserts the item which the button_id refers to into the transactions table
var sql = 'insert into currentuser (id, username) select id, username from users where id = ?;'
console.log("Attempting sql ->"+sql+"<-");
connection.query(sql, id,(function(res){return function(err,rows,fields){
if(err){console.log("We have an insertion error:");
console.log(err);
res.send(err);} else
{res.send("Successfully added user");} // Let the upstream guy know how it went
}})(res));
});
//when a button is clicked the according item is removed from transactions
app.get("/deleteclick",function(req,res){
var id = req.param('id');
//removes the item which the item_id refers to in the transactions table
var sql = 'delete from transactions where item_id = ?;'
console.log("Attempting sql ->"+sql+"<-");
connection.query(sql, id,(function(res){return function(err,rows,fields){
if(err){console.log("We have an deletion error:");
console.log(err);
res.send(err);} else {
res.send("Successfully deleted"); // Let the upstream guy know how it went
}
}})(res));
});
//deletes everything in transactions
app.get("/void",function(req,res){
//truncates transactions
var sql = 'truncate transactions';
console.log("Attempting sql ->"+sql+"<-");
connection.query(sql, function(err,rows,fields){
if(err){console.log("We have an truncation error:");
console.log(err);
res.send(err);} else {
res.send("Successfully void"); // Let the upstream guy know how it went
}
})
});
app.get('/removeUsers',function(req,res){
var sql = 'truncate currentuser';
console.log('Attempting sql ->'+sql+'<-');
connection.query(sql, function(err,rows,fields){
if(err){
console.log("Errored on truncation");
console.log(err);
res.send(err);
} else
{res.send("Successfully removed users");}
})
});
//Adds all the prices in transactions
app.get("/total",function(req,res){
//selects all the items in transactions and calculates the sum of their prices
var sql = 'select sum(price) as total from transactions;';
console.log("Attempting sql ->"+sql+"<-");
connection.query(sql,(function(res){
console.log(res);
return function(err,rows,fields){
var total = rows[0].total;
var totals = '0';
if (total != null) {
totals = total.toString();
}
console.log(rows);
console.log(rows[0]);
if(err){console.log("We have an error:");
console.log(err);}
res.send(totals);
}})(res));
});
app.get("/getReceipt", function(req, res) {
var sql = 'SELECT DISTINCT label, COUNT(label) as numBought, price, price*COUNT(label) as Cost from transactions group by label;';
connection.query(sql, function(err,rows,fields) {
if(err) {
console.log(err);
}
jsonObj = [];
for(var i = 0; i < rows.length; i++) {
var label = rows[i].label;
var numBought = rows[i].numBought;
var individualCost = rows[i].price;
var totalCost = rows[i].Cost;
item = {};
item["Item"] = label;
item["Number Bought"] = numBought;
item["Cost per Item"] = individualCost;
item["Total for item"] = totalCost;
console.log("Pushing the item");
console.log(item);
jsonObj.push(item);
}
res.send(jsonObj);
})
});
app.listen(port);