Question 105748 in Azure Question posted in
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Unable to append data into Azure storage using Python

I am using the below code to append data to Azure blob using python.

from azure.storage.blob import AppendBlobService
append_blob_service = AppendBlobService(account_name='myaccount', account_key='mykey')

# The same containers can hold all types of blobs
append_blob_service.create_container('mycontainer')

# Append blobs must be created before they are appended to
append_blob_service.create_blob('mycontainer', 'myappendblob')
append_blob_service.append_blob_from_text('mycontainer', 'myappendblob', u'Hello, world!')

append_blob = append_blob_service.get_blob_to_text('mycontainer', 'myappendblob')

The above code works fine, but when I tried to insert new data, the old data gets overwritten.
Is there any way I can append data to ‘myappendblob’

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2

Answers


  1. 0

    Try this code which is taken from the Document and it is given by @Harsh Jain ,

    from azure.storage.blob import AppendBlobService
   def append_data_to_blob(data):
     service = AppendBlobService(account_name="<Storage acc name>",

       account_key="<Storage acc key>")

     try:

       service.append_blob_from_text(container_name="<name of Conatiner >", blob_name="<The name of file>", text = data)

     except:

       service.create_blob(container_name="<name of Conatiner >", blob_name="<the name of file>")

       service.append_blob_from_text(container_name="<name of Conatiner>", blob_name="<the name of file>", text = data)

     print('Data got Appended ')

 append_data_to_blob('Hi blob')

    Taken References from:

    https://www.educative.io/answers/how-to-append-data-in-blob-storage-in-azure-using-python

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  2. 0

    Considering you are calling the same code to append the data, the issue is with the following line of code:

    append_blob_service.create_blob('mycontainer', 'myappendblob')

    If you read the documentation for create_blob method, you will notice the following:

    Creates a blob or overrides an existing blob. Use if_none_match=* to
    prevent overriding an existing blob.

    So essentially you are overriding the blob every time you call your code.

    You should call this method with if_none_match="*" as the documentation suggests. If the blob exists, your code will throw an exception which you will need to handle.

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