Ajax Web服务架构

Question

What is the difference between:

1. Using ajax to call web services directly and rendered the result into the html, and
2. Using ajax to call a local proxy and let the local proxy to call web services?

Answer 1

the biggest difference is database transactions. if your web service layer is orthogonal and fine-grained and common use-cases require multiple calls. often you want to bundle more than one call into a single atomic database transaction: e. g. (debit account A, credit account B).

to do this you must use a local proxy because you cannot demarcate transactions on the client.