sequelize.query() is not a FUNCTION - node.js

Question

I am new to sequelize. I am trying to use row query, but I'm getting an error.
Code:
const sequelize = require('sequelize');
sequelize.query("SELECT * from users").then(results => {
console.log(results);
})
Error while calling this API:
(node:2380) UnhandledPromiseRejectionWarning: TypeError: sequelize.query is not a function
at Promise (C:\NodejsProject\mars\app\schedule\models\schedule.js:247:17)
at new Promise (<anonymous>)
How can I fix this?

Answer 1

You can't use sequelize directly from require('sequelize'); ,
first we need to create instance of that , and instance will be
created from DB details , so sequelize can know on which platform ,
which DB it has to run the query
Here is the basic snippet , just for a idea :
const Sequelize = require('sequelize');
const sequelize = new Sequelize('database', 'username', 'password', {
host: 'localhost',
dialect: 'mysql'|'sqlite'|'postgres'|'mssql',
pool: {
max: 5,
min: 0,
acquire: 30000,
idle: 10000
},
// SQLite only
storage: 'path/to/database.sqlite',
// http://docs.sequelizejs.com/manual/tutorial/querying.html#operators
operatorsAliases: false
});
sequelize.query("SELECT * from users").then(results => {
console.log(results);
});
For more detail : DO READ

Answer 2

If you are running your db config in external file AND want and extra layer to protect from SQL injection
./database/dbs.js
const Sequelize = require('sequelize')
const db = {}
const sequelize = new Sequelize('dbname',
'username',
'password', {
host: 'localhost',
dialect: 'mysql',
logging: console.log,
freezeTableName: true,
pool: {
max: 5,
min: 0,
acquire: 30000,
idle: 10000
}
})
db.sequelize = sequelize
db.Sequelize = Sequelize
module.exports = db
then in the file you want to use:
const db = require('../database/db')
...
const newDbName = 'myNewDb'
db.sequelize.query(`CREATE DATABASE IF NOT EXISTS ${newDbName} `, {
type: db.sequelize.QueryTypes.CREATE
}).then( () => {
res.send('ok done creating ' + req.body.newDbName).end()
}).catch( err => {
res.status(500).send('Err executing command ' + err).end()
})

Answer 3

dbConnect.js:
const Sequelize = require('sequelize');<br/>
const con = new Sequelize.Sequelize(<br/>
'db',
"user",
"password",
{
host: "localhost",
dialect: "mysql",
operatorsAliases: false,
pool: {
max: 5,
min: 0,
acquire: 30000,
idle: 10000
},
},
);
con.query("SELECT 1", (err, rows) => {
console.log(rows)
if (err) throw err;
console.log(err)
}).then(function (result){
console.log("inventory")
console.log(result)
});
module.exports = con;
// import
let con = require("../common/dbConnect")
// use in function
const [results, metadata] = await con.query(
"SELECT * FROM officer JOIN user ON officer.UserID = user.UserID"
);
console.log(JSON.stringify(results, null, 2));