Stream-Data-From-Flask-To-Postgres

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Stream-Data-From-Flask-To-Postgres

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A tutorial on streaming data from a Flask REST API and streaming the response into PostgreSQL

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# Stream Data From Flask To Postgres
A tutorial on streaming data from a Flask REST API and streaming the response into PostgreSQL

![](https://raw.githubusercontent.com/Sean-Bradley/Stream-Data-From-Flask-To-Postgres/master/streaming.gif)

Using pgAdmin4

1. Create a new database called `stream_test` in a local install of PostgreSQL
![Create a new database called 'stream_test'](https://raw.githubusercontent.com/Sean-Bradley/Stream-Data-From-Flask-To-Postgres/master/create_db.gif)

2. Create a Table
![](https://raw.githubusercontent.com/Sean-Bradley/Stream-Data-From-Flask-To-Postgres/master/create_table.gif)

and name it `transactions`
![and name it 'transactions'](https://raw.githubusercontent.com/Sean-Bradley/Stream-Data-From-Flask-To-Postgres/master/transactions.gif)

and give it these colums below
![and give it these colums](https://raw.githubusercontent.com/Sean-Bradley/Stream-Data-From-Flask-To-Postgres/master/columns.gif)

3. Start 'mock_api.py'
```bash
$ python mock_api.py
```

4. Test it by visiting `http://127.0.0.1:5000/very_large_request/10`

```
Example Response of 10 tuples
('22f5f6b0-59ea-4480-a875-665c7c240d23', '44b4e810-7fbf-4ff7-b0f2-9f30f8bb206a', 0.32) ('f264e9a5-f7a6-4b7b-b0f9-d649bc6161d0', '72961696-9eaf-46dd-97f1-e7fb532295ef', 185.13) ('c5738e2d-afc8-48ad-b54e-0129740f2043', '1f7b8189-7934-4814-8f95-db4dca6520e5', 160.92) ('8573707e-1bf7-4f53-a63b-0ce14a00e3c7', '8e8cdacb-c0d8-4a5b-841f-0a57fc07169d', -442.79) ('3ca714c7-5081-46f4-8a65-35ee008c2500', 'cb9f7c8c-87db-4141-b32d-c440d4afab95', 800.43) ('2f5bf700-d1a3-4a42-8cdd-9f28bf7c030f', '7e7ccd63-38b9-4e49-9bb7-fc6ebfd91f74', -74.17) ('1797e5ee-d496-4c7f-a10b-ec69bedde0be', '01d8b804-0603-4163-8558-babfb95e9dab', -649.62) ('26591a3a-650e-4ac9-8a31-6a07a76dde83', 'f8e77946-3c9c-4276-8cee-7e5add4cb40b', 719.06) ('7d67eb18-0c1c-47d6-b67f-839ba4866f5f', '48bd81cb-f0fe-4416-ad62-796613af9cb1', -27.81) ('166d9119-1d6c-4e5d-87f7-c7c1ff8ee366', '8c18c32f-c2b5-4a4a-840d-4326432b128a', 470.55) 
```

5. Start `$ python ingest.py`
Expect lots of lines of output written to the console,

6. Go to pgAdmin4 and inspect your new table as it is filling up with data.
![pgAdmin showing load](https://raw.githubusercontent.com/Sean-Bradley/Stream-Data-From-Flask-To-Postgres/master/pgadmin.gif)

7. Also execute the sql below a few times if you want to see the numbers rise.
```sql
select count(*) from transactions
```

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