Feature: Remember previously used NS and DB #35

[AL1L]

Thank you for submitting this pull request! We appreciate you spending the time to work on these changes.

What is the motivation?

Issue #35

What does this change do?

Parses the query before sending it to the server then upon successful response, extract the USE statements from the query and apply the DB and NS if they were updated.

What is your testing strategy?

Added a print line to print out the namespace and database used before each request, used the USE statement and observed the change. Removed the print line.

Is this related to any issues?

Fixes #35

Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

[tobiemh]

Hey @AL1L this is awesome, although the reason that this hasn't been implemented yet is that the sql REPL should really connect over WebSocket (waiting for the Rust client library for that), and that will therefore lead to the possibility to store params across queries.

I'll keep this PR open for the time being while we wait for the Rust client, and then we can come back to this at that point.

[AL1L]

Yeah, I saw that in another PR and I thought I'd just send this one as an interim solution as it wasn't too difficult.

[ansarizafar]

Repl prompt should show the currently used NS and DB
namespace.database>
OR
namespace/database>

[tobiemh]

Hi @AL1L I'm going to close this pull request, because we will soon be changing to the WebSocket implementation instead of an HTTP connection, which will solve this issue, and a number of other issues too!