connection-spec should have one of the forms:
The general form.
For backward compatibility.
The two forms of strings are distinguished by the presence (or absence) of the '
@
' character. In both forms,
password
can be omitted along with the preceding '
/
'. Also,
username
can simply be omitted.
Note that this means that
"xyz"
and
"@xyz"
are both interpreted to give the same values (
username
is null,
password
is null,
dsn
is
"xyz"
).