[CASSANDRA-12349] Adding some new features to cqlsh

• Type: New Feature
• Status: Resolved
• Priority: Low
• Resolution: Won't Fix
• Component/s: Legacy/Tools
• Labels: cqlsh

Environment

All

• Assignee: Unassigned
• Reporter: vin01
• Created: 30/Jul/16 03:53
• Updated: 01/Jul/21 16:30
• Resolved: 01/Jul/21 16:30

Description

I will like to have following features in in cqlsh, I have made a patch to enable them as well.

1. Aliases.
2. Safe mode (prompt on delete,update,truncate,drop if safe_mode is true).
3. Press q to exit.

Its also shared here -> https://github.com/vineet01/cassandra/blob/trunk/new_features.txt

Example for aliases :-

cassandra@cqlsh> show
; <enter> ALIASES HOST SESSION VERSION
cassandra@cqlsh> show ALIASES ;
Aliases :>

{'dk': 'desc keyspaces;', 'sl': 'select * from'}

now if you type dk and press <tab> it will auto complete it to "desc keyspace".

Adding an alias from shell :-

cassandra@cqlsh> alias slu=select * from login.user ;
Alias added successfully - sle:select * login.user ;
cassandra@cqlsh> show ALIASES ;
Aliases :>

{'slu': 'select * from login.user ;', 'dk': 'desc keyspaces;', 'sl': 'select * from'}

cassandra@cqlsh> sle
Expanded alias to> select * from login.user ;
username | blacklisted | lastlogin | password

Adding an alias directly in file :-

aliases will be kept in same cqlshrc file.
[aliases]
dk = desc keyspaces;
sl = select * from
sle = select * from login.user ;

now if we type just "sle" it will autocomplete rest of it and show next options.

Example of safe mode :-

cassandra@cqlsh> truncate login.user ;
Are you sure you want to do this? (y/n) > n
Not performing any action.

cassandra@cqlsh> updatee login.user set password=null;
Are you sure you want to do this? (y/n) >
Not performing any action.

Initial commit :- https://github.com/vineet01/cassandra/commit/0bfce2ccfc610021a74a1f82ed24aa63e1b72fec

Current version :- https://github.com/vineet01/cassandra/blob/trunk/bin/cqlsh.py

Please review and suggest any improvements.