Firestore is a NoSQL document database built for automatic scaling, high performance, and ease of application development. It is the newest version of Datastore and introduces several improvements over Datastore.
Because Firestore in Datastore mode is optimized for server use cases and for App Engine, we recommend using Firestore in Datastore mode for databases that will be used primarily by App Engine apps. Firestore in Native mode is most useful for mobile and real-time notification use cases. For more information about Firestore modes, see Choosing between Native Mode and Datastore mode.
This document describes how to use the Google Cloud Client Library to store and retrieve data in a Datastore mode database.
Prerequisites and setup
Follow the instructions in "Hello, World!" for Go on App Engine to set up your environment and project, and to understand how Go apps are structured in App Engine. Write down and save your project ID, because you will need it to run the sample application described in this document.
Clone the repository
Download (clone) the sample:
go get -d -v github.com/GoogleCloudPlatform/golang-samples/datastore
cd $GOPATH/src/github.com/GoogleCloudPlatform/golang-samples/appengine_flexible/datastore
Edit project configuration and set dependencies
In app.yaml
, set GCLOUD_DATASET_ID
for your project. This value is your
project ID.
Application code
The sample application logs, retrieves, and displays visitor IPs. You can see
that a log entry is a simple two-field class that is given the type visit
,
and is saved to Datastore mode using the Datastore Client
put
command. Then, the ten most recent visits are retrieved in descending order,
using the Datastore Client
NewQuery
and
GetAll
commands.
Using index.yaml
files
The sample app performs simple queries. More elaborate Datastore mode queries require
one or more indexes, which you must specify
in an index.yaml
file
that you upload along with your app. This file may be created manually, or
generated automatically while testing your app locally.
Local testing
If you need to develop and test your application locally, you can use the Datastore mode emulator.
For more information
For complete information on Datastore mode, including optimizations and concepts, see the Cloud Firestore in Datastore mode documentation.