Express - get request - How inject data in my response along the process? - express

I'm trying to add data to my "data" returned in express. Here my snippet, I'm trying to add currentPage and count variables:
app.get("/blog/page/:pageTargeted", (req,res) => {
var rangeScoped = (req.params.pageTargeted * 8);
Posts.find().sort({ date: -1}).skip(rangeScoped).limit(8).exec(function (err, data) {
data.currentPage= req.params.pageTargeted || 1 ;
data.count = Posts.estimatedDocumentCount();
if (err) return console.error(err);
console.log(data);
res.status(200).send(data)
})
});
I have also tried:
currentPage= req.params.pageTargeted || 1 ;
count = Posts.estimatedDocumentCount();
if (err) return console.error(err);
console.log(data);
res.status(200).send(data currentPage, count)
It doesn't works, currentPage and count aren't add in the res.send toward the browser. I have just the data corresponding to the database get's request. So what it going wrong ? I just can't figure out it. Because to me I have well injected the data into the object so, it should works. If anybody has an hint, would be great.

If I am right data is an array and you can't create a new key in array like that. Try sending an Object instead.
app.get("/blog/page/:pageTargeted", (req,res) => {
var rangeScoped = (req.params.pageTargeted * 8);
Posts.find().sort({ date: -1}).skip(rangeScoped).limit(8).exec(function (err, data) {
if (err) return console.error(err);
console.log(data);
res.status(200).json({data: data, currentPage: req.params.pageTargeted || 1, count: Posts.estimatedDocumentCount()})
})
});

Related

How can I refresh datatable in Wire using refreshApex

#wire(_getContacts,{recordId:'$recordId'}) wiredContacts({error,data}){
this.dataToRefresh = data;
if (data) {
this.contacts = this.dataToRefresh.recordList;
this.ContactsRecords = this.dataToRefresh.cList;
this.contactsSize = " Case Contacts (" + this.contacts.length + ")";
}else{
//
}
};
relateContacts() {
this.showSpinner = true;
this.showtable=false;
relateContacts({contacts: this.selected, recordId: this.recordId})
.then(data => {
this.showSpinner=false;
this.showtable=true;
this.showSuccessMessage();
refreshApex(this.dataToRefresh);
//location.reload();
this.isShowModal = false;
})
.catch(error => {
console.log(error);
this.showSpinner=false;
const evt = new ShowToastEvent({
title: 'Application Error',
message: error.body.message,
variant: 'error',
mode: 'sticky'
});
this.dispatchEvent(evt);
this.showSpinner = false;
});
}
For this code, I tried refreshApex with all possible ways. but I'm not sure the miss here. I've Checked all the blogs but everywhere, the solution is mentioned.
Tried refreshApex like below :
#wire(_getContacts,{recordId:'$recordId'}) wiredContacts({data}){
this.dataToRefresh = data;
But this also does not work
Ah that is a fun one ! Your issue is using destructuring in wiredContacts as the parameter.
(The {data} or {data,error} normally works as a parameter to the function being called back, except if you have to do refresh) Try this instead.
#wire(_getContacts,{recordId:'$recordId'}) wiredContacts(value){
this.dataToRefresh = value;
const {data, error} = value;
//Rest of you code now with data and error
}
Then in your other method you can do:
method(){
refreshApex(this.dataToRefresh);
}
Salesforce does show doing this in their example code, but it’s easy to miss and experience the fun you have been having with this.
https://developer.salesforce.com/docs/component-library/documentation/en/lwc/lwc.apex_result_caching
See the last example on their page.

How to add variable into JSON path

This is the query I am using:
app.get("/items/:data", async (req, res) => {
const { data } = req.params;
query = `
SELECT items.discount
FROM items
WHERE items.discount #? '$[*] ? (#.discount[*].shift == $1)'
`
try {
const obj = await pool.query(query, [data]);
res.json(obj.rows[0])
} catch(err) {
console.error(err.message);
}
});
I get this error:
error: bind message supplies 1 parameters, but prepared statement "" requires 0
I am using node-postgres package in node.js.
How can I solve this issue?
Use bracket notation instead of dot notation. So instead of obj.key use obj[key]
Updated
all them driver connectors come with their own method to do what you're looking for. node-postgres also have there own
Pool
import { Pool } from 'pg';
const pool = new Pool({
  host: 'localhost',
user: 'database-user',
max: 20,
idleTimeoutMillis: 30000,
connectionTimeoutMillis: 2000,
});
/**
* execs the given sql statement.
*
* #param {string} sql - query to run.
* #param {Array} params - an array with the parameter.
* #example
* runQuery("SELECT * FROM users WHERE id = $1", [1]).then(result=> console.log(result))
*/
export async function runQuery (sql, params) {
const connection = await pool.connect()
try {
await connection.query('BEGIN')
const queryText = 'INSERT INTO users(name) VALUES($1) RETURNING id'
const result = await connection.query(sql,params);
// check what result has
console.log(result);
return connection.query('COMMIT').then(result)
} catch (e) {
await connection.query('ROLLBACK')
throw e;
throw e
} finally {
connection.release()
}
}
Pool Config
config = {
// all valid client config options are also valid here
// in addition here are the pool specific configuration parameters:
// number of milliseconds to wait before timing out when connecting a new client
// by default this is 0 which means no timeout
connectionTimeoutMillis?: int,
// number of milliseconds a client must sit idle in the pool and not be checked out
// before it is disconnected from the backend and discarded
// default is 10000 (10 seconds) - set to 0 to disable auto-disconnection of idle clients
idleTimeoutMillis?: int,
// maximum number of clients the pool should contain
// by default this is set to 10.
max?: int,
}
conclution
so basically the structure of a query should be like or less this
const text = 'INSERT INTO users(name, email) VALUES($1, $2) RETURNING *'
const values = ['brianc', 'brian.m.carlson#gmail.com']
connection
.query(text, values)
.then(res => {
console.log(res.rows[0])
// { name: 'brianc', email: 'brian.m.carlson#gmail.com' }
})
.catch(e => console.error(e.stack))

Node js TypeError: Cannot read property 'nick' of undefined

The Issiue
Issue is basically if i try to combine query+variable or put it in "fake pdo" style, it does not work.
Code
if(page == "profile"){
var user = "Failed to load.";
con.query('SELECT * FROM users WHERE id = '+con.escape(parseInt(userIDRequested)), function (err, result, fields) {
//console.log(result);
user= result[0].nick;
io.emit('userinfo', { nick: user});
});
}
app.get("/user/:start", function(req, res){
page = "profile";
var user_id = req.params['start'];
pageid = user_id;
if(didshitgetupdated == false){
useridRequested = pageid;
didshitgetupdated = true;
}
res.writeHeader(200, {"Content-Type": "text/html"});
let btlib = btNetLib(res);
btlib.btSend(navbar);
btlib.btSendFile("profile/index.html");
finishConnection(res);
})
but for some reason i get this:
TypeError: Cannot read property 'nick' of undefined
at Query.<anonymous> (D:\bricktalenode\bricktale.js:36:29)
at Query.<anonymous> (D:\bricktalenode\node_modules\mysql\lib\Connection.js:526:10)
at Query._callback (D:\bricktalenode\node_modules\mysql\lib\Connection.js:488:16)
at Query.Sequence.end (D:\bricktalenode\node_modules\mysql\lib\protocol\sequences\Sequence.js:83:24)
at Query._handleFinalResultPacket (D:\bricktalenode\node_modules\mysql\lib\protocol\sequences\Query.js:149:8)
at Query.EofPacket (D:\bricktalenode\node_modules\mysql\lib\protocol\sequences\Query.js:133:8)
at Protocol._parsePacket (D:\bricktalenode\node_modules\mysql\lib\protocol\Protocol.js:291:23)
at Parser._parsePacket (D:\bricktalenode\node_modules\mysql\lib\protocol\Parser.js:433:10)
at Parser.write (D:\bricktalenode\node_modules\mysql\lib\protocol\Parser.js:43:10)
at Protocol.write (D:\bricktalenode\node_modules\mysql\lib\protocol\Protocol.js:38:16)
Things i tried
making a if condition to check it
(did not helped)
connecting database using another thing
i used same query(changed variable for php though) in php to access, query is ok, so issue on my node.js code then.
waiting for some time ( did not helped)
parse int
nothing really helped that i done
but for some reason i get stuff correctly using console.log(result);
but i cant fetch them using the code.
The results
[ RowDataPacket {
nick: '[MODERATED 5]',
id: 5,
password: 'fdaf40dc5531c0acf82911892f552f0a',
banned: 0,
coins: 0,
registerdate: 2021-05-10T02:55:45.000Z,
status: 'BETA STATUS',
rank: 'Player',
rep: 1,
token: 'token',
lastonline: '2021-05-10 03:05:08',
lastdaily: 2021-05-19T07:04:34.000Z } ]
but i cannot access it
app.get("/user", function(req, res){
page = "profile";
res.writeHeader(200, {"Content-Type": "text/html"});
let btlib = btNetLib(res);
btlib.btSend(navbar);
btlib.btSendFile("profile/index.html");
var sql = 'SELECT * FROM users WHERE id = ?';
con.query(sql, req.query.id, function (err, result) {
if (err) throw err;
setInterval(() => {
var bricklet;
bricklet = result[0].nick;
console.log(bricklet);
io.emit('userinfo', { nick: bricklet});
},150);
});
finishConnection(res);
})
moving stuff inside of my app.get solved it.

Insert session data into postgres database in Nodejs Expess app

I have an Nodejs express function where I am trying to insert data that is stored in the browser session into my postgres database. When I have the insert statement like this, the insert works but the session-stored customer_id isn't inserted and is just left null.
On the line with "var sql = INSERT INTO journal....", the values $1 and $2 are from user input and work correctly.
How can I get value 3 of the customer_id stored in the session to insert correctly? I would appreciate any advice or greater understanding.
app.post("/addJournalEntry", addJournalEntry);
function addJournalEntry(req, res) {
console.log("Posting data");
// var id = req.query.id;
//body is for post, query is for get
const customer_id = req.session.customer_id;
const journal_entry_date = req.body.journal_entry_date;
const journal_entry = req.body.journal_entry;
const params = [journal_entry, journal_entry_date, customer_id];
addEntryFromDataLayer(params, function (error, addEntry) {
console.log("Back From the addEntryFromDataLayer:", addEntry);
if (error || addEntry == null) {
res.status(500).json({
success: false,
data: error
});
}
else {
// res.json(result);
res.status(200).json(addEntry);
}
});
}
function addEntryFromDataLayer(params, callback) {
console.log("addEntryFromDataLayer called with id");
var sql = "INSERT INTO journal (journal_entry, journal_entry_date, customer_id) VALUES($1::text, $2::text, $3)";
// var params = [id];
pool.query(sql, params, function (err, addEntry) {
if (err) {
console.log("error in database connection");
console.log(err);
callback(err, null);
}
console.log("Found DB result:" + JSON.stringify(addEntry));
callback(null, addEntry);
});
}

Reading from one db into another

I am trying to right a function that copies some fields from several company databases into my own database once a day. What I have so far is below. I am wondering if where I console.log(rs) I can open another sql connection to my database and write the data or if I have to store the results somewhere and then open a new connection and send the stored results.
function updateJobs() {
var query = "SELECT JobStart, JobEnd FROM JobData";
sql.connect(Config, (err) => {
if (err) {
console.log("Error while connecting database :- " + err);
} else {
var request = new sql.Request();
request.query(query, function (err, rs) {
if (err) {
console.log("Error while querying database :- " + err);
sql.close();
} else {
console.log(rs);
sql.close();
}
})
}
})
}
This might help
// Source Database
sourceDB.each(`select * from ${Sourcetable}`, (error, row) => {
console.log(row);
const keys = Object.keys(row); // ['columnA', 'columnB']
const columns = keys.toString(); // 'columnA,columnB'
let parameters = {};
let values = '';
// Generate values and named parameters
Object.keys(row).forEach((r) => {
var key = '$' + r;
// Generates '$columnA,$columnB'
values = values.concat(',', key);
// Generates { $columnA: 'ABC', $columnB: 'GHK' }
parameters[key] = row[r];
});
// Insert into another database into OneTable (columnA,columnB) values ($columnA,$columnB)
// Parameters: { $columnA: 'ABC', $columnB: 'GHK' }
destDB.run(`insert into ${Desttable} (${columns}) values (${values})`, parameters);
})
})