Develop Reference

Node SQLite3 - crashes when running insert on specific table

I have a SQLite database I am trying to add data to with the sqlite3 package. My query is as follows, and works in the SQLite command line.
'INSERT INTO `EVENTS`(`ID`,`EventName`,`EventSociety`,`BookerName`,`BookerEmail`,`BookerStudentID`,`BookerPhone`,`TimeStart`,`TimeEnd`,`EquipmentList`,`EventSearchYear`,`EventSearchMonth`,`EventSearchDay`) VALUES (NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL);';
And I'm using this code to insert to the database in node.
db.run("begin transaction");
let sql = 'INSERT INTO `EVENTS`(`ID`,`EventName`,`EventSociety`,`BookerName`,`BookerEmail`,`BookerStudentID`,`BookerPhone`,`TimeStart`,`TimeEnd`,`EquipmentList`,`EventSearchYear`,`EventSearchMonth`,`EventSearchDay`) VALUES (NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL);';
console.log(sql);
db.run(sql,(err) => {
res.send('ok');
});
db.run("commit");
Trying this in node hard crashes, with a Illegal instruction: 4. However, it is only happening on two tables, both with over 5 fields, in my database, and not any other smaller ones. Is there a character limit I'm unaware of?

To avoid crash, we need to handle error as below:
Example
The line db.run(sql, params, function (err) { in below example:
let sql = `INSERT INTO Users(id,firstName,lastName,email,password,permissionLevel) VALUES (?,?,?, ?,?,?)`;
let params = [uuid4(), "fn1", "ln1", "a#a2.com", "pwd1", 0];
db.run(sql, params, function (err) {
if (err) {
console.error("Error: Insert failed: ", err.message);
console.error("Error: Full error: ", err);
return;
}
console.log("insert success");
});

SQLITE_MISUSE: bad parameter or other API misuse [duplicate]

I've searched on how to create a sqlite3 database with a callback in Node.js and have not been able to find any links. Can someone point me towards documentation or provide a 2-3 line code sample to achieve the following:
Create a sqlite3 database and catch an error if the creation fails for any reason.
Here is what I've tried:
let dbCreate = new sqlite3.Database("./user1.db", sqlite3.OPEN_CREATE, function(err){
if(!err){
logger.infoLog("Successfully created DB file: " + dbFileForUser + " for user: " + username );
} else {
logger.infoLog("Failed to create DB file: " + dbFileForUser + ". Error: " + err );
}
});
dbHandler[username] = dbCreate;
When I execute this, I get the following error:
"Failed to create DB file: ./database/user1.db. Error: Error: SQLITE_MISUSE: bad parameter or other API misuse"
This call without callback works just fine.
var customDB = new sqlite3.Database("./custom.db", sqlite3.OPEN_READWRITE | sqlite3.OPEN_CREATE);
But in this, I will not know if I run into any errors while creating the Database.

Try this:
let userDB = new sqlite3.Database("./user1.db",
sqlite3.OPEN_READWRITE | sqlite3.OPEN_CREATE,
(err) => {
// do your thing
});
Example.

#Irvin is correct, we can have a look at http://www.sqlitetutorial.net/sqlite-nodejs/connect/ and
check it says if you skip the 2nd parameter, it takes default value as sqlite3.OPEN_READWRITE | sqlite3.OPEN_CREATE
and in this case if database does not exist new database will be created with connection.
sqlite3.OPEN_READWRITE: It is to open database connection and perform read and write operation.
sqlite3.OPEN_CREATE : It is to create database (if it does not exist) and open connection.
So here is the first way where you have to skip the 2nd parameter and close the problem without an extra effort.
const sqlite3 = require("sqlite3").verbose();
let db = new sqlite3.Database('./user1.db', (err) => {
if (err) {
console.error(err.message);
} else {
console.log('Connected to the chinook database.|');
}
});
db.close((err) => {
if (err) {
return console.error(err.message);
}
console.log('Close the database connection.');
});
And this is the 2nd way to connect with database (already answered by #Irvin).
const sqlite3 = require("sqlite3").verbose();
let db = new sqlite3.Database('./user1.db', sqlite3.OPEN_READWRITE | sqlite3.OPEN_CREATE
, (err) => {
if (err) {
console.error(err.message);
} else {
console.log('Connected to the chinook database.');
}
});
db.close((err) => {
if (err) {
return console.error(err.message);
}
console.log('Close the database connection.');
});

Mongoose query doesn't run when readyState is 1

I have written the following code, it's for a discord bot. When I call the command I get matchID in console for the first time. But when I call the command again I dont get any output. It gets stuck near the point where I have console.log("Stuck Here"). I new to mongoose so I don't know what to do.
if (mongoose.connection.readyState === 0) {
mongoose.connect(`mongodb://localhost/${server}`, {
useNewUrlParser: true
});
console.log('mongoose readyState is ' + mongoose.connection.readyState);
}
console.log("Stuck here!");
mongoose.connection.on("error", function (err) {
console.log("Could not connect to mongo server!");
return console.log(err);
});
mongoose.connection.on('connected', function (ref) {
console.log('Connected to mongo server.');
mongoose.connection.db.listCollections({
name: "matches"
}).next(function (err, collinfo) {
if (err) console.log(err);
if (collinfo) {
Matches.findOne({}, {}, {
sort: {
'created_at': -1
}
}, function (err, match) {
if (err) console.log(err);
console.log(`${match.matchID}`);
})
} else {
}
});
})

Mongoose is really meant to be used with a single database. It isn't impossible to create create multiple connections, or use multiple database, but it's not trivial either. For instance, you have to declare each of your models for each connection/database (see this answer, for instance).
It's probably much easier to use a single database, and adjust your models so they contain a property server that you can use as a key in all your queries.
So to check if there's a Matches document for server "X", you'd run Matches.findOne({ server : 'X' }).
You could also consider creating a separate model Servers that would store metadata for servers, and use references between the Matches and Servers models. More info on that here.

I can`t delete anything from my MongoDB [duplicate]

I'm currently working on my first node.js rest api with express, mongodb (atlas cloud) and mongoose, when i try to make a .remove request i get this error:
{
"error": {
"name": "MongoError",
"message": "Cannot use (or request) retryable writes with limit=0",
"driver": true,
"index": 0,
"code": 72,
"errmsg": "Cannot use (or request) retryable writes with limit=0"
}
This is my request:
router.delete('/:productId', (req, res, next) => {
const id = req.params.productId;
Product.remove({ _id: id })
.exec()
.then(result => {
res.status(200).json(result);
})
.catch(err => {
console.log(err);
res.status(500).json({
error: err
})
}); ;
});

The findOneAndRemove() function would work more accordingly since its specific to the filtering method passed in the function .findOneAndRemove(filter, options) to remove the filtered object. Still, if the remove process is interrupted by the connection the retryRewrites=true will attempt the execution of the function when connected.
More information here
When using retryRewrites set to true tells the MongoDB to retry the same process again which in fact can help prevent failed connections to the database and operate correctly, so having it turn on is recommended.
More info here
If you are using Mongoose 5^ and MongoDB 3.6 your code is better written like:
mongoose.connect('mongodb.....mongodb.net/test?retryWrites=true', (err) => {
if(err){
console.log("Could not connect to MongoDB (DATA CENTER) ");
}else{
console.log("DATA CENTER - Connected")
}
});// CONNECTING TO MONGODB v. 3.6
router.delete('/:productId', (req, res, next) => {
const id = req.params.productId;
Product.findOneAndRemove({ _id: id })//updated function from .remove()
.exec()
.then(result => {
res.status(200).json({
message: "Product Removed Successfuly"
});
})
.catch(err => {
console.log(err);
res.status(500).json({
error: err
})
}); ;
});

I just changed the true to false in retryWrites=true and it worked. Is that a good approach? Or there is a better way to solve this problem?

retryWrites=true is a good thing, a workaround for this incompatibility is to use findOneAndRemove instead of remove (looks like you're using mongoose)

How to create a mongo db using javascript ?

I am trying to create a mongodb on the fly based on user input using javascript. Here is a snipit of the code I am writing.
mp.MongoClient.connect("mongodb://admin:admin_password#mongo_server.com:27017/admin")
.then(function (db) {
getListOfDatabases(db)
.then(function (databases) {
if (doesDatabaseExist(databases)) {
mp.MongoClient.connect("mongodb://admin:admin_password#mongo_server.com:27017/"+userDefinedDb)
.then(function (userDb) {
insertInFakeCollection(userDb, dbObject);
createRead(userDb, dbObject);
})
.fail(function(err){
console.log(err);
})
}
})
})
.fail(function (err) {
console.log(err);
})
I am able to to connect and get a list of databases, I try to connect to the user defined database, mongo throws me an error { [MongoError: auth failed] name: 'MongoError', ok: 0,errmsg: 'auth failed', code: 18 }
The admin password and user name are the same and it has role userAdminAnyDatabase.
I am not sure what I am doing wrong or why this issue is occurring. any help is appreciated.