Handling Errors Gracefully

No one's perfect. Code, like people, can make mistakes. This is OK! What's important is that we learn how to handle our difficulties while keeping our composure. Handling errors is an important part of the process when dealing with Node & SQL in particular. When our code throws an error, we should be able to handle it before it reaches our end users and incites panic and concern. We still want to know what happened, so that we can perform a suitable action based on the error that occurred — so we catch the error.

For db.run(), db.each(), db.get(), and db.all(), the first argument to the callback will always be an Error object if an error occurred. If there is no error, this argument will be null. We can check if this error exists, and if it does exist, we can handle it.