Develop Reference

Storing JSON objects in the postgreSQL using parameterized query

I am having problems with saving JSON objects in the database using parameterized queries. I am using postman to send this object on red.body
enter image description here
On my server side I havet his code:
queryController.createQuery = (req, res, next) => {
const { info }= req.body;
const sqlQuery = 'INSERT INTO test (info) VALUES ($1) RETURNING *';
db.query(sqlQuery, [info])
.then(result => {
console.log(result);
if (result) res.locals.message = "Saved the query successfully";
next();
})
.catch(err => {
return next({
log: `queryController.createQuery: ERROR: ${typeof err === 'object' ? JSON.stringify(err) : err}`,
message: { err: 'Error occurred in queryController.createQuery. Check server log for more details.'},
})
})
Why is that I still get this error: enter image description here
throw new TypeError('Client was passed a null or undefined query')
^
TypeError: Client was passed a null or undefined query
Here is my table schema:
CREATE TABLE test (
id serial NOT NULL PRIMARY KEY,
info json NOT NULL
);
How do I format $1 correctly to get it accept it as JSON file?

Query example:
EXECUTE 'INSERT INTO test (info) VALUES ($1) RETURNING *' USING '[{"size": "Small", "quantity": 1, "product_id": 1}]'::jsonb;

MongoDB find documents but exclude those without the field

I'm trying to query a collection and sort it by a field that doesnt exist in every record. For example im calling this:
exports.getProductPriceByLosers = (req,res) => {
Market.find()
.sort({ "analytics.one_day_change": 1 })
.select('analytics.one_day_change name')
.limit(10)
.exec((err, data) => {
if (err){
return res.status(400).json({
error: 'No products found'
})
}
res.json(data)
})
}
However the field 'one_day_change' doesn't exist on every record so the result im getting is about 20 products first without that field, and then it returns the prodcuts i do need with the correct sort. Is there a way i can tell mongo not to return those documents i dont need / dont have the data i need?
Thanks!! x

You can use $exists: true to get only documents where that field exists.
exports.getProductPriceByLosers = (req,res) => {
Market.find({"analytics.one_day_change":{ "$exists": true}})
.sort({ "analytics.one_day_change": 1 })
.select('analytics.one_day_change name')
.limit(10)
.exec((err, data) => {
// ...
})
}
Check this example

NodeJs insert current Datetime field into MySQL db

I'm trying to insert a DATETIME field into my MySQL db.
var dt = require('moment')().format('YYYY-MM-DD HH:mm:ss');
pool.query(
`insert into login(id, id_utente, data_login) values(NULL,?,?)`,
[results[0].id],
[dt],
(error, results, fields) => {
}
);
I get this error:
C:\Users\tiger\Desktop\prova\REST_API_WITH_MYSQL-master\node_modules\mysql\lib\protocol\Parser.js:437
throw err; // Rethrow non-MySQL errors
^TypeError: this._callback.apply is not a function
If I try this code, everything comes right:
pool.query(
`insert into login(id, id_utente, data_login) values(NULL,?,"2021-01-27 00:00:00")`,
[results[0].id],
//[dt],
(error, results, fields) => {
}
);
What i'm doing wrong?

You have your parameters in 2 separate arrays. Put your parameters in the same parameter array.
pool.query(
`insert into login(id, id_utente, data_login) values(NULL,?,?)`,
[results[0].id, dt],
(error, results, fields) => {
}
);

The correct format probably is YYYY-MM-DD HH:MM:SS(I think it depends on MySQL configuration, but this is the default) as the docs points out.
So you should try using moment's format() method like this:
const myDate = moment(data.myTime.format('YYYY/MM/DD HH:mm:ss')).format("YYYY-MM-DD HH:mm:ss");
pool.query(
`insert into login(id, id_utente, data_login) values(NULL,?,?)`,
[results[0].id, myDate],
(error, results, fields) => {
}
);

mySql Insert Syntax - Not Inserting What's Expected

I have this INSERT query. It does create a record in the table, but "client" value is 0, and "short" value is null. However, all of the console logs show the correct data. I'm assuming this is a simple syntax error in my use of the question marks. But I can't find that, or seem to get it to work using just variable names either. Any help is appreciated.
app.put("/audit/create", function (req, res) {
console.log("It is getting to the route");
const client = req.body.client;
const short = req.body.short;
console.log(`client: ${client}`);
console.log(`short: ${short}`);
connection.getConnection(function (err, connection) {
connection.query(
`INSERT INTO audits (client, short)
VALUES (?, ?)`,
[
{
client: client,
},
{
short: short,
},
],
function (error, results, fields) {
if (error) throw error;
res.json(results);
console.log(`Audit has been created`);
}
);
connection.release();
});
});
I've also tried using the variables names of ${client}, ${short} in place of the questions marks... and that still gives me the same result. However the console logs that render ${client} and ${short} do log the correct data I'm expecting to see.

Why are you passing objects as the values to the query? Try just:
connection.query(
'INSERT INTO audits (client, short) VALUES (?, ?)',
[ client, short ],
function ...

Send DBNull.Value instead of 'null' in nodeJS MySql

HOw can i send null value to database in node.js?
I am using MySql Package for node JS
and I have some null values to insert which I want to be stored in database as DBNull.Value( as in asp.net) and not as "null" or " ".
Also, I cannot skip any value to insert.
My code below:
var query=connection.query("insert into user_details(user_id,username,screenname,firstname,middlename,lastname,about_me,color_code,Gender,hobbies,occupation,member_of_group,profile_pic,address1,address2,city,pincode,phonenumber,EmailId1,EmailId2,createdate,updatedate) values('"+json.user_id+"','"+ json.username+"','"+json.screenname+"','"+json.firstname+"','"+json.middlename+"','"+json.lastname+"','"+json.about_me+"','"+json.color_code+"','"+json.Gender+"','"+json.hobbies+"','"+json.occupation+"','"+json.member_of_group+"','"+json.profile_pic+"','"+json.address1+"','"+json.address2+"','"+json.city+"',"+json.pincode+",'"+json.phonenumber+"','"+json.EmailId1+"','"+json.EmailId2+"','"+json.createdate+"','"+json.updatedate+"');",function(err,result){
if(!err){
connection.destroy();
callback(result);
}
else
{
console.log(err);
callback('error');
}
});
How can I do that???

First of all, you shouldn't directly concatenate (especially user submitted) values for security reasons and it's just plain tedious when you have a lot of concatenation going on.
Try this instead which makes it easier to work with and properly escapes your values:
connection.query('INSERT INTO user_details SET ?', json, function(err, result) {
connection.destroy();
if (err)
console.log(err);
callback(err, result);
});
or manually specify the values if the keys in the data source do not match up with column names:
var values = {
user_id: json.id,
username: json.user,
// ...
};
connection.query('INSERT INTO user_details SET ?', values, function(err, result) {
connection.destroy();
if (err)
console.log(err);
callback(err, result);
});
Secondly, typically callbacks use "error-first", so passing a real error object as the first argument is better.