Error Handling in CRUD Operations
Learn to recognize and handle common MongoDB errors, such as duplicate keys, invalid syntax, and accessing non-existent collections, to write more reliable and efficient database code.
Error handling is an essential part of working with any database, including MongoDB. Errors can occur for a variety of reasons:
Incorrect query syntax
Violations of database rules (like duplicate IDs)
Accessing non-existent collections or databases
Understanding how to recognize, handle, and fix these errors can save us time and prevent data loss.
Understanding common errors in MongoDB
MongoDB Shell provides detailed error messages to help us understand what went wrong. They follow a common structure. Below is an example of an error message:
{"ok": 0,"code": 11000,"errmsg": "E11000 duplicate key error collection: test.users index: _id_ dup key: { _id: 1 }"}
Here, ok: 0 indicates that the operation failed, code refers to a specific error code (e.g., 11000 for duplicate key) and errmsg contains a detailed description of the error.
Let's look at some of the common errors in detail.