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count()

Addedv2.4.x

This operation counts the number of entities that match the specified filtering expression.

count(data): Promise<CountResult>

Request Syntax

milvusClient.count({
    db_name?: string,
    collection_name: string,
    expr?: string,
    timeout?: boolean
})

PARAMETERS:

• db_name (str) -

  The name of the database that holds the target collection.

• collection_name (str) -

  [REQUIRED]

  The name of the collection to create an alias for.

• expr (string) -

  A scalar filtering condition to filter matching entities.

  You can set this parameter to an empty string to skip scalar filtering. To build a scalar filtering condition, refer to Boolean Expression Rules.

• timeout (number)

  The timeout duration for this operation. Setting this to None indicates that this operation timeouts when any response arrives or any error occurs.

RETURNS Promise<CountResult>

This method returns a promise that resolves to a CountResult object.

{
    data: number,
    status: {
        code: number,
        error_code: number | string,
        reason: string
    }
}

PARAMETERS:

• data (number) -

  The number of entities that match the specified filtering expression.

• status (object) -

  • code (number) -

    A code that indicates the operation result. It remains 0 if this operation succeeds.

  • error_code (string | number) -

    An error code that indicates an occurred error. It remains Success if this operation succeeds.

  • reason (string) -

    The reason that indicates the reason for the reported error. It remains an empty string if this operation succeeds.

Examples

const milvusClient = new milvusClient(MILUVS_ADDRESS);
const num_entities = await milvusClient.count({
   collection_name: 'my_collection',
   expr: "age in [1,2,3,4,5,6,7,8]",
});

// 1000