Oracle Database Connection Pool with node.js - node.js

Question

I am new to Node.js. I am trying to make connection pools with multiple databases. I have successfully made connection pools (i think) with below mentioned code. I know in order to execute query operations i have to do something at "Connection pool DBX Success", but i can't seem to figure out what to do so that i am able to execute queries on desired pool say crm1.execute or crm2.execute. What can i do here to achieve this. The only way i can think of is to write execute functions for each database separately which i know is wrong and i have to work with 15 databases so it isn't possible to write functions for all 15 databases separately.
const config = require("../config/config");
const oracledb = require("oracledb");
crm1 = config.crm1;
crm2 = config.crm2;
const crm1pool = oracledb.createPool ({
user: crm1.user,
password: crm1.password,
connectString: crm1.connectString,
poolMin: 1,
poolMax: 10,
poolTimeout: 300
}, (error,pool)=>{
if (error){
console.log(error);
}
console.log("Connection Pool DB1 success")
});
const crm2pool = oracledb.createPool ({
user: crm2.user,
password: crm2.password,
connectString: crm2.connectString,
poolMin: 1,
poolMax: 10,
poolTimeout: 300
}, (error,pool)=>{
if (error){
console.log(error);
}
console.log("Connection Pool DB2 success")
});

Answer 1

There is a lot of node-oracledb documentation on pooling and examples. Study those first.
Then you might find that giving each pool a poolAlias will let you easily choose which to use:
await oracledb.createPool({
user: 'hr',
password: myhrpw, // myhrpw contains the hr schema password
connectString: 'localhost/XEPDB1',
poolAlias: 'hrpool'
});
await oracledb.createPool({
user: 'sh',
password: myshpw, // myshpw contains the sh schema password
connectString: 'otherhost/OTHERDB',
poolAlias: 'shpool'
});
const connection = await oracledb.getConnection('hrpool');
const result = await connection.execute(
`SELECT manager_id, department_id, department_name
FROM departments
WHERE manager_id = :id`,
[103], // bind value for :id
);
console.log(result.rows);