Node Api rest - change database dynamically| - mysql

Question

Is it possible to change the pool config database?
I have a rest API with node/express, and I have multiple databases.
So I need that when a user.company login in my frontend, the API rest, choose the database that user should use.
My configuration file for the bank is this .env
JWT_KEY=XXXXXXX
POOL1_USER=root
POOL1_PASSWORD=xxxxxx
POOL1_DATABASE=data1
POOL1_HOST=host.domain.com
POOL1_PORT=3306
Meu arquivo db.js é este:
const mysql = require("mysql");
const pool1 = mysql.createPool({
connectionLimit: 10,
user: process.env.POOL1_USER,
password: process.env.POOL1_PASSWORD,
database: process.env.POOL1_DATABASE,
host: process.env.POOL1_HOST,
port: process.env.POOL1_PORT,
});
module.exports = { pool1 };
Is this my controllers.js file?
const mysql = require("../db").pool1;
exports.adminGroup = (req, res, next) => {
mysql.getConnection((error, conn) => {
if (error) {
return res.status(500).send({ error: error });
}
conn.query(
"INSERT INTO adminGroup SET ?",
[req.body],
(error, results) => {
conn.release();
if (error) {
return res.status(500).send({ error: error });
}
response = {
mensagem: "Group add",
grupoCriado: {
id: results.insertId,
grupo: req.body.group,
},
};
return res.status(201).send(response);
}
);
});
};
I need to dynamically change the database, as I have the same frontend for the same rest API, but I have multiple databases that can even be on different hosts.
It may be that what I'm trying to implement is not possible, so does anyone have any different suggestions?

Answer 1

Before you use the query to select a table from a database, you need to switch the database, use this query to achieve that.
con.query("USE your_db_name", function (err, result, fields) {
if (err) throw err;
console.log(result);
});
then after it use the query that you want like this
const mysql = require("../db").pool1;
exports.adminGroup = (req, res, next) => {
mysql.getConnection((error, conn) => {
if (error) {
return res.status(500).send({ error: error });
}
con.query("USE your_db_name", function (err, result, fields) {
if (err) throw err;
console.log(result);
});
conn.query(
"INSERT INTO adminGroup SET ?",
[req.body],
(error, results) => {
conn.release();
if (error) {
return res.status(500).send({ error: error });
}
response = {
mensagem: "Group add",
grupoCriado: {
id: results.insertId,
grupo: req.body.group,
},
};
return res.status(201).send(response);
}
);
});
};