Tcl-Interface: Nested db eval in db eval script?

The eval method of the sqlite Tcl Interface has the syntax:

dbcmd eval sql ?array-name script? 

Is it allowed, to use other [dbcmd eval ..] calls (with the same
dbcmd) inside the script? For example

db1 eval {SELECT a,b FROM t1} {} {
    puts $b
    db1 eval "SELECT c,d FROM t2 WHERE c='$a'" {} {
        puts "\t$d"
    }
}

I've tried it. At least with read-only access inside the script, this
seems to work. But I thought, it's better, to ask. Is this allowed?
Are there limits or problems with that (if ever)?

rolf









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