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Append data to an attachment without reloading it's large size content

A Elbarbary
Tera Guru

‎12-29-2023 09:21 AM - edited ‎12-29-2023 09:24 AM

Hi community,

 

There is a situation where I need to process large chunks of data (coming from a web service) and write it to an attachment. The problem with GlideSysAttachment.write or GlideSysAttachment.writeContent is that it requires all the content at once and I believe that it will be too large to fit in memory (I don't have clues yet how large the data would be but I know it will be very).


Due to this, I wanted to know if it's possible to dump first page then programmatically append next pages to the existing attachment. I tried to add base64 data to to table sys_attachment_doc  but that didn't work, also I searched the documentation and the only file stream class GlideScriptableInputStream/GlideTextReader provides only reading capabilities.

 

Thanks in advance.

 

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Tushar
Kilo Sage

‎12-29-2023 09:27 AM

Hi there,

 

One of my friend had the same use case and I remember them implementing an external cloud storage service rather than storing it directly in ServiceNow.

 

Thanks,

Tushar