Create a database connection: Derby server @ CONNECT - Connections @ MentDB Weak

Click on 'CONNECT' tab, right click on 'Database' and select 'Create derby server connection'

MQL input
cm set "demo_cm_derby_server" {execute "db.derby.server.config.get"
	"[hostname]" "localhost, 127.0.0.1"
	"[port]" "1527"
	"[database]" "demo/db/derby/test_db"
	"[user]" "sa"
	"[password]" "sa"
;};
MQL output
"1"

Click on refrech button: 

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