@Fernando Vázquez :
To connect to a Delta table stored in blob storage and display it in a web app, you can use the Delta Lake REST API. Here are the steps:
- First, make sure that you have created an Azure Blob Storage account and stored the Delta table in it.
- Next, create a REST endpoint in your web app that can receive requests to fetch data from the Delta table. You can use any web framework for this such as Flask, Django, or Express.js.
- In your endpoint function, use the Delta Lake REST API to fetch the data from the Delta table. You can make HTTP requests to the API endpoint of your Delta table with the following format:
https://<storage-account-name>.dfs.core.windows.net/<container-name>/<delta-table-name>?op=LIST&recu...
This will return a JSON response containing a list of all the Delta table files..
Once you have the list of files, you can download them and read them using any Delta Lake API. For example, you can use the delta. read_table method to read the Delta table into a Spark DataFrame.
Finally, you can serialize the DataFrame to JSON or any other format that your web app can display and return it in the response to the client.
Here's some sample Python code that shows how to fetch data from a Delta table stored in blob storage using the Delta Lake REST API:
import requests
from delta import DeltaTable
def fetch_data_from_delta_table():
storage_account_name = "<your-storage-account-name>"
container_name = "<your-container-name>"
delta_table_name = "<your-delta-table-name>"
api_endpoint = f"https://{storage_account_name}.dfs.core.windows.net/{container_name}/{delta_table_name}?op=LIST&recursive=true"
response = requests.get(api_endpoint)
files = response.json()["fileStatuses"]["fileStatus"]
delta_files = [f for f in files if f["path"].endswith(".snappy.parquet")]
delta_table = DeltaTable.forPath(spark, f"wasbs://{container_name}@{storage_account_name}.dfs.core.windows.net/{delta_table_name}")
delta_df = delta_table.toDF()
# Do some processing on the Delta DataFrame
return delta_df.toJSON().collect()
This function will fetch the data from the Delta table and return it in JSON format. You can then use this data in your web app to display it to the user.
