---
name: "mongoc_bulk_operation_update_one"
section: "3"
platform: "linux"
package: "libmongoc-doc"
version: "1.30.4-1+deb13u3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/mongoc_bulk_operation_update_one"
---

# mongoc\_bulk\_operation\_update\_one(3)

## SYNOPSIS

```
void
mongoc_bulk_operation_update_one (mongoc_bulk_operation_t *bulk,
                                  const bson_t *selector,
                                  const bson_t *document,
                                  bool upsert);
```

This function queues an update as part of a bulk operation. It will only modify a single document on the MongoDB server. This function does not execute the operation. To execute the entirety of the bulk operation call *mongoc\_bulk\_operation\_execute()*.

This function is superseded by *mongoc\_bulk\_operation\_update\_one\_with\_opts()*.

## PARAMETERS

- •

  **bulk**: A *mongoc\_bulk\_operation\_t*.

- •

  **selector**: A *bson\_t* that selects which document to remove.

- •

  **document**: A *bson\_t* containing the update document.

- •

  **upsert**: **true** if an **upsert** should be performed.

**WARNING:**

**document** *must only* contain fields whose key starts with **$**. See the update document specification for more details.

**SEE ALSO:**

```
mongoc_bulk_operation_update()
```

```
mongoc_bulk_operation_update_one_with_opts()
```

## AUTHOR

MongoDB, Inc

## COPYRIGHT

2009-present, MongoDB, Inc.