Re: enums, using methods as initializers

Daniel Pitts <>
Wed, 21 Nov 2007 11:19:10 -0800
Mikhail Teterin wrote:

Stefan Ram wrote:

Mikhail Teterin <> writes:

What I'm looking for is a way to go through all fields and
extract them from the row in a loop.

{ final java.sql.ResultSetMetaData desc = resultSet.getMetaData();
  final int cols = desc.getColumnCount();
  for( int i = 1; i <= cols; ++i )
  ( desc.getColumnName( i )+ " " + resultSet.getString( i )); }

  I have not tested the above code, so it still might contain bugs.
  You also can get the type from the meta data. See

Thank you, that's pretty cool. But that goes through the columns of the
ResultSet. I'm trying to go through the fields of my own Class, however.

I know, I can store the data in my own HashTable, but I would rather access
the fields as and entry.meow instead of entry.getFoo() and



If you REALLY REALLY want to go through the fields of a class (Bad
Idea), you can use reflection.

Reflection is difficult to get right, so I suggest delegating that
responsibility to a library that is maintained by a large community.
Hibernate does exactly what you want. *Exactly* what you want. Let me
repeat. Hibernate does *exactly* what you're trying to do.

If you insist on going the route of DIY, read my warning about reflection:


If after reading that, you feel justified in using reflection, the sun
tutorial on reflection is a good starting place:

Just know that I've gone down the road you're trying to. It isn't a
pretty journey, and the destination isn't all that nice either.
Daniel Pitts' Tech Blog: <>

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