Re: mySQL
From: PerfectDayToChaseTornados (pdtct_at_emailaddress.invalid)
Date: 01/19/05
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Date: Wed, 19 Jan 2005 19:52:18 GMT
"Frances Del Rio" <fdr58@yahoo.com> wrote in message
news:357fatF4ii89tU1@individual.net...
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| PerfectDayToChaseTornados wrote:
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| > "Frances Del Rio" <fdr58@yahoo.com> wrote in message
| > news:352tn7F4hshg7U1@individual.net...
| > | klynn47@comcast.net wrote:
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| oh man.. is this an API??? what's ORM? I can't believe how complicated
| this db thing is turning out to be.. is this "hibernate" better than
| using jdbc? or is this a query language?
|
| thanks again.. Frances
Hi Frances,
An ORM is an Object Relational Mapping tool or framework. Basically it lets
you map Java objects to relational databases (& usually uses JDBC & sql
under the covers). Yes it has an API, it does all the stuff you would end up
doing manually & saves you from re-inventing the wheel. A good ORM tool will
also do it more efficiently than you could, unless you are a real DB expert.
The people that write these things are usually extremely clever people with
very in depth database knowledge, much more than us mere mortals :-)
In Hibernate, for example you can create a class & provide a simple XML file
to map this class to your database table(s)& columns (it can even create the
db tables for you from the xml & even the classes if you want it to - it is
very versatile). You then call a factory class to lookup or persist your
objects for you & you do not need to write any sql. It is a really good idea
to have a reasonable understanding of how databases work though when using
these tools. Hibernate is great & it is free & there is a really good forum
on the site, where people are very helpful. The authors of Hibernate have
also written an excellent book "Hibernate in Action" which can take you from
being a newbie, to being fairly skilled. It also teaches quite a lot about
databases & sql on the way. I wouldn't jump straight into using it, you'd be
better to learn some sql & database stuff first. But then try it out, you'd
be amazed how much easier, cleaner & more efficient it makes your code :-)
-- -P "Programs that are hard to read are hard to modify. Programs that have duplicated logic are hard to modify. Programs with complex conditional logic are hard to modify" ( Kent Beck)
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