The KnoxLine shell environment datasource selection creates the connection for the session. The connection is kept for the session or until datasource select is used to create a connection to a new datasource. Each SQL query continues to use the same connection. The connections are cleaned up and closed through a shutdown hook for the KnoxLine environment.
In the interactive KnoxShell there are Custom Groovy Commands for datasource management and SQL queries submission. The life of the connection is limited to each command rather than being able to be used again in subsequent queries. Connections are closed for each query. This requires a new connection and login per query - since login isn't done at datasource selection time like it is in KnoxLine.
This change aligns the two environments. Connections are managed at the shell environment level rather than at the command level. Connections are created when selecting datasources rather than and SQL query invocation. Connections are cleaned up in the interactive shell through a shutdown hook.