Updating a blob content in azure container

Question

Greetings,

Is there any way to update the content of a blob (Using PATCH or PUT method) that is in Azure container using rest API in any preferred programming language(Python, Node...)? I have a user's list json file in the blob storage and I want to add a user on a button click to the blob storage.

Thanks,

Answer 1

Hello @Yididiya Samuel ,
If the blob is of type "Appendblob" , then we can update the content.
Below is the C#.net code

public static void AppendUsersToExistingJsonInBlobStorage()

    {  

        string connection = "DefaultEndpointsProtocol=https;AccountName=storageaccountname;AccountKey=key=;EndpointSuffix=core.windows.net";  

        string filename = "users.json";  

        string containerstring = "users";  

        CloudStorageAccount storage = CloudStorageAccount.Parse(connection);  
        CloudBlobClient client = storage.CreateCloudBlobClient();  
        CloudBlobContainer container = client.GetContainerReference(containerstring);  
        CloudAppendBlob blob = container.GetAppendBlobReference(filename);  

        using (MemoryStream stream = new MemoryStream())  
        using (StreamWriter sw = new StreamWriter(stream))  
        {  
            sw.WriteLine("user3");  
            sw.Flush();  
            stream.Position = 0;  
            blob.AppendFromStream(stream);  
        }  
    }  

Please note: Above code might not maintain the JSON formatting after adding/updating the blob , so please modify accordingly based upon your requirements

Regards,
Shiva.

Answer 2

@Yididiya Samuel

with python sdk you can check this link:
https://learn.microsoft.com/en-us/python/api/azure-storage-blob/azure.storage.blob.appendblobservice.appendblobservice?view=azure-python-previous

for example :

from azure.storage.blob.appendblobservice import AppendBlobService  
  
append_blob = AppendBlobService(account_name=None, account_key=None, sas_token=None)  
append_blob.append_blob_from_text()