If you are creating a web app that uses lambda and a mysql database, there will be many times where you need to have sql information passing to and from lambda functions. A way to connect a lambda functions to a mysql database is using npm mysql. To set up the connection, there must be a connection variable defined. This variable must contain the mysql host name, user, password, and database. Once these are defined, the lambda function can connect to the mysql database with the code “connection.connect()”. Once this is ran, your lambda function can now run queries. These queries are written just like a regular sql query. Once you are done running your query make sure to declare your connection closed by stating “connection.end()”.
The process.env variables would be were you put your sql information.
**Note: You might need to configure your lambda function to be set up on the mysql database’s VPC.