How to Efficiently Find Documents by ID using MongoDB's MGOMGO Library?

Find by ID using MGO

MGO offers two methods for finding data by ID: FindId() and Find().

Using FindId()

When using FindId(), pass only the ID value:

err2 := c.FindId(bson.ObjectIdHex("58593d1d6aace357b32bb3a1")).One(&data)

Using Find()

With Find(), specify the ID field name:

err2 := c.Find(bson.M{"_id": bson.ObjectIdHex("58593d1d6aace357b32bb3a1")}).One(&data)

Handling Errors

If no error is returned, the document is found. If you consistently see a zero value (indicating a missing document), ensure the ID field name matches the one stored in MongoDB. Use struct tags to map field names (e.g., bson:"myid").

Performance Optimization

For better performance, connect to the MongoDB server once and reuse the session instead of establishing a new connection each time. Refer to the documentation for details.

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