What are some examples of connection pooling in Node.js?
Connection pooling in Node.js helps manage multiple database connections efficiently. For example, using the mysql
package, you can create a pool like this:
const mysql = require('mysql');
const pool = mysql.createPool({
connectionLimit: 10,
host: 'localhost',
user: 'root',
password: 'password',
database: 'test'
});
This allows you to reuse connections instead of creating a new one for each request.
Can you show me how to query the database using the pool?
Sure! You can use the pool to query the database like this:
pool.query('SELECT * FROM users', (error, results) => {
if (error) throw error;
console.log(results);
});
This will execute the query and log the results.
What happens if a connection fails?
If a connection fails, the pool will automatically handle it by attempting to create a new connection. You can also listen for error events to manage failures more gracefully.
Are there any best practices for using connection pools?
Yes, some best practices include setting an appropriate connection limit, handling errors properly, and closing connections when they are no longer needed to avoid memory leaks.
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