Hi all,
in Jmol 14.2 an SQL-like syntax was introduced for queries using
'getProperty' and 'within'. The documentation states that it can also be
used for user-defined associative arrays. But I couldn't find any
examples of it.
So I am not sure if it is actually possible to query a two-dimensinal
associative array on the second level. Searching a one-dimensional
associative array with a "SELECT ... WHERE ..."-like statement doesn't
seem to offer much benefit. So I hope it is possible.
I could figure out how to query an array of associative arrays in the
following example (not making much sense without additional associative
array content):
--- Example Query 1 -------------------------
y = [{"type": "a"}, {"type": "b"}, {"type": "a"}];
z = getProperty(y, "[SELECT * WHERE type='a']");
print "y: type=" + z.type + " size=" + z.size;
show z;
y: type=array size=2
z = [ { "type":"a" },{ "type":"a" } ]
---------------------------------------------
But I usually need direct access to any array element by a predictable
key. So I need a two-dimensional associative array like in the following
two examples. I tried the same syntax and another one inspired from the
"Array drilling" section in the documentation. But both didn't work:
--- Example Query 2 -------------------------
x = {"key_1": {"type": "a"}, "key_2": {"type": "b"}, "key_3": {"type":
"a"}};
z = getProperty(x, "[SELECT * WHERE type='a']");
print "x: type=" + z.type + " size=" + z.size;
show z;
x: type=string size=0
z = ""
--- Example Query 3 -------------------------
x = {"key_1": {"type": "a"}, "key_2": {"type": "b"}, "key_3": {"type":
"a"}};
z = getProperty(x, "[SELECT *][SELECT * WHERE key1='a']");
print "x: type=" + z.type + " size=" + z.size;
show z;
x: type=string size=0
z = ""
---------------------------------------------
Q: Is it possible to query a two-dimensional associative array on the
second level and if yes how is the syntax?
Regards,
Rolf
--
Rolf Huehne
Postdoc
Leibniz Institute for Age Research - Fritz Lipmann Institute (FLI)
Beutenbergstrasse 11
07745 Jena, Germany
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