Purpose of this time

GAE (Python3) enables data registration update / acquisition using Cloud NDB. Basically, use github samples. This time, the module of python-docs-samples \ appengine \ standard_python3 \ building-an-app \ building-an-app-2 I am creating it as a base.

Modify / install requirements.txt

Add the following to requirements.txt directly under the project.

`requirements.txt`


google-cloud-ndb

After adding, execute the following command in the directory directly under the project to install google-cloud-ndb.

pip install -r requirements.txt

This completes the Cloud NDB installation.

Creating data registration / update / acquisition process

This time, we will create a module for simple data registration update acquisition processing. The contents are as follows.

`main.py`


import datetime
from flask import Flask, render_template
from datastore import user

app = Flask(__name__)

@app.route('/')
def root():
  #Register or update test user
  user.putData('test')
  #Get test user
  selectUsr = user.get('test')
  return render_template('index.html', user=selectUsr)


if __name__ == '__main__':
    app.run(host='127.0.0.1', port=8080, debug=True)

`datastore/user.py`


import datetime
from google.cloud import ndb

#User information
class User(ndb.Model):
  #Last login date and time
  lastLoginDt = ndb.DateTimeProperty()

client = ndb.Client()

#User registration / update
def putData(idStr):
  with client.context():
    user = User(
      id=idStr,
      lastLoginDt = datetime.datetime.now())
    user.put()

#User acquisition
def get(idStr):
  with client.context():
    return ndb.Key(User, idStr).get()

Set the item with class. User registration / update and user acquisition are performed under with client.context ():. This time it is simple, but if there is no data, the process of updating the login date if registered is described.

`templates/index.html`


<!doctype html>
<html>
<head>
  <title>Sample</title>
  <script src="{{ url_for('static', filename='script.js') }}"></script>
  <link type="text/css" rel="stylesheet" href="{{ url_for('static', filename='style.css') }}">
</head>
<body>

  <h1>Sample</h1>
  <h2>{{ user.lastLoginDt }}</h2>
</body>
</html>

Confirm that the login date and time of the registered and updated login user is displayed.

Do the following:

python main.py

Check http://127.0.0.1:8080/.

I was able to confirm the login date and time. Let's take a look at the data store. The data was registered. When I accessed it again, I was able to confirm that the date and time were updated.