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Showing content from https://cloud.google.com/nodejs/docs/reference/datastore/6.5.0/datastore/query below:

Class Query | Node.js client library

Class Query

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Build a Query object.

**Queries are built with {module:datastore#createQuery} and .**

Datastore Queries

Package@google-cloud/datastore Constructors (constructor)(scope, kinds)

constructor(scope?: Datastore | Transaction, kinds?: string[] | null);

Constructs a new instance of the Query class

Parameters Name Description scope Datastore | Transaction
kinds string[] | null
(constructor)(scope, namespace, kinds)

constructor(scope?: Datastore | Transaction, namespace?: string | null, kinds?: string[]);

Constructs a new instance of the Query class

Parameters Name Description scope Datastore | Transaction
namespace string | null
kinds string[]
Properties endVal

endVal: string | Buffer | null;

Property Value Type Description string | Buffer | null filters Property Value Type Description Filter[] groupByVal Property Value Type Description Array<{}> kinds Property Value Type Description string[] limitVal Property Value namespace

namespace?: string | null;

Property Value Type Description string | null offsetVal Property Value orders Property Value scope

scope?: Datastore | Transaction;

Property Value Type Description Datastore | Transaction selectVal Property Value Type Description Array<{}> startVal

startVal: string | Buffer | null;

Property Value Type Description string | Buffer | null Methods end(end)

end(end: string | Buffer): this;

Parameter Name Description end string | Buffer
Returns Type Description this

{Query}

filter(property, value)

filter(property: string, value: {}): Query;

Parameters Name Description property string
value {}
Returns filter(property, operator, value)

filter(property: string, operator: Operator, value: {}): Query;

Parameters Name Description property string
operator Operator
value {}
Returns groupBy(fieldNames)

groupBy(fieldNames: string | string[]): this;

Group query results by a list of properties.

Parameter Name Description fieldNames string | string[]
Returns Type Description this

{Query}

hasAncestor(key)

hasAncestor(key: Key): this;

Parameter Name Description key Key

Key object to filter by.

Returns Type Description this

{Query}

limit(n) Parameter Name Description n number

The number of results to limit the query to.

Returns Type Description this

{Query}

offset(n) Parameter Name Description n number

The offset to start from after the start cursor.

Returns Type Description this

{Query}

order(property, options)

order(property: string, options?: OrderOptions): this;

Sort the results by a property name in ascending or descending order. By default, an ascending sort order will be used.

Datastore Sort Orders

Parameters Name Description property string

The property to order by.

options OrderOptions

Options object.

Returns Type Description this

{Query}

run(options)

run(options?: RunQueryOptions): Promise<RunQueryResponse>;

Parameter Name Description options RunQueryOptions
Returns Type Description Promise<RunQueryResponse> run(options, callback)

run(options: RunQueryOptions, callback: RunQueryCallback): void;

Parameters Name Description options RunQueryOptions
callback RunQueryCallback
Returns run(callback)

run(callback: RunQueryCallback): void;

Parameter Name Description callback RunQueryCallback
Returns runStream(options)

runStream(options?: RunQueryStreamOptions): import("stream").Transform;

Run the query as a readable object stream.

Query#runStream

Parameter Name Description options RunQueryStreamOptions

Optional configuration. See for a complete list of options.

Returns Type Description import("stream").internal.Transform

{stream}

select(fieldNames)

select(fieldNames: string | string[]): this;

Retrieve only select properties from the matched entities.

Queries that select a subset of properties are called Projection Queries.

Projection Queries

Parameter Name Description fieldNames string | string[]

Properties to return from the matched entities.

Returns Type Description this

{Query}

start(start)

start(start: string | Buffer): this;

Parameter Name Description start string | Buffer
Returns Type Description this

{Query}

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-07 UTC.

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