[seek-dev] SQL db candidates for data query
peter.mccartney at asu.edu
Wed Jun 23 10:18:10 PDT 2004
This thread has listed a number of cool products that vary in features,
but its not clear to me that everyone's contributiion is motivated by
exactly the same intended use. I understood Jing's original queston to
be about a suitable tool for dynamically loading data that are normally
stored as ascii files into a relational database so that they may be
queryied. For that I think products like th hsqldb (or PointBase which
was a commercial java db shipped with forte for a while), are ideal
because they are exposed as jdbc connections and thus will work with any
code you've already written to work with existing sql data. Exist is an
xpath/xquery engin and berkelydb seems to be somewhat proprietary
(although I didn't really look at it). Thus with those tools, you don't
get the immediate benefit of yourexisting sql code.
We had been thinking we would do this in our project using mysql or
postgres, but both of those involve an installation and configuration
step inorder to make them accessible. A javabased db avoides that
neatly, albeit at the expense of performance.
Peter McCartney (peter.mccartney at asu.edu)
Center for Environmental-Studies
Arizona State University
> -----Original Message-----
> From: seek-dev-admin at ecoinformatics.org
> [mailto:seek-dev-admin at ecoinformatics.org] On Behalf Of
> Bertram Ludaescher
> Sent: Wednesday, June 23, 2004 1:41 AM
> To: Matt Jones
> Cc: Jing Tao; seek-dev at ecoinformatics.org
> Subject: Re: [seek-dev] SQL db candidates for data query
> Hi all:
> Sorry that I might have missed the beginning of this thread..
> There is also Sparrow DB ;-)
> We have done some experiments with storing a simple
> relational query engine close to the data. It's a 100KB
> runtime overhead and gives you relational and recursive
> queries, possibly in the future some XML querying
> capabilities as well. Right now, not much is available or
> checked in, but the local SMSers will provide more info once
> we're back in town and can actually work on this =B-)
> PS I don't want to get into a XML vs. relational debate right
> now. The
> short answer: there a good arguments for each of them..
> >>>>> "MJ" == Matt Jones <jones at nceas.ucsb.edu> writes:
> MJ> Hi Jing,
> MJ> Also, you might consider this Java version of Berkeley DB from
> MJ> Sleepycat.
> MJ> http://www.sleepycat.com/products/je.php?src=javaed
> MJ> I'm not sure about its features, particularly sql support, but it
> MJ> seems
> MJ> like a good potential system given the excellence of the
> MJ> berkeley db product.
> MJ> Matt
> MJ> Jing Tao wrote:
> >> Hi, Serguei:
> >> Actually the query is base on sql. Now we are thinking about the
> >> issue
> >> that user don't want a entire data object(i.e. data tables
> or text files)
> >> but part of this data object which match a sql query.
> >> One approach to achieve this purpose is to load text files into a
> >> relational db and it is easy to run a sql query against
> the db. We are
> >> think this approach can be done in both ecogrid server
> side and kepler
> >> client side.
> >> Of course, postsql, oracle and other one are good
> candidates as a sql
> >> engine. But they are too huge to redistribution with
> kepler. So we are looking for a light
> >> weight java relational db.
> >> Thanks.
> >> Jing
> >> On Thu, 17 Jun 2004, Serguei Krivov wrote:
> >>> Date: Thu, 17 Jun 2004 22:10:39 -0400
> >>> From: Serguei Krivov <Serguei.Krivov at uvm.edu>
> >>> To: 'Jing Tao' <tao at nceas.ucsb.edu>, seek-dev at ecoinformatics.org
> >>> Subject: RE: [seek-dev] SQL db candidates for data query
> >>> Hi All,
> >>> I did not attend the last meeting and I do not know much
> about the
> >>> requirements for ql. Yet , before opting for sql db it is good to
> >>> know if sql support (not XQuery and friends) is really the main
> >>> requirement. In fact, should we abandon the world of well
> >>> established sql rdbms (e.g postgresql, oracle) and switch to new
> >>> java databases, then we shall have a wide vistas of options that
> >>> include native xml databases and a lot of other things.
> >>> has installed one here at
> >>> http://ecoinformatics.uvm.edu:8080/exist/index.xml
> >>> There are a lot of others as well, see:
> >>> In fact I wonder if there is a DB specifically designed
> for DL( or
> >>> may be we can write one ;-) ) But surely, if the target query
> >>> language is not sql, then why do not to consider non sql
> dbs? Ciao,
> >>> serguei
> >>> -----Original Message-----
> >>> From: seek-dev-admin at ecoinformatics.org
> >>> [mailto:seek-dev-admin at ecoinformatics.org] On Behalf Of Jing Tao
> >>> Sent: Wednesday, June 16, 2004 6:46 PM
> >>> To: seek-dev at ecoinformatics.org
> >>> Subject: [seek-dev] SQL db candidates for data query
> >>> Hi, everyone:
> >>> I am eveluating the sql db candidates for data query. It
> turns out
> >>> that
> >>> the following ones are pretty good: hsqldb and Mckoi.
> >>> Here is the features both of them share:
> >>> 1)Open source
> >>> 2)Write in pure java and everything is in jar files.
> >>> 3)Have server/client and stand-alone mode.
> >>> 4)Have JDBC implementation.
> >>> 5)Support Linux, Windows.
> >>> Moreover, hsqldb has a good feature that support CSV (Comma
> >>> Separated
> >>> Value) or other delimited text file as the source of
> their data. So user
> >>> don't need use sql command to insert data into db and
> only tell the
> >>> text
> >>> file location and the sperator. It even can ommit the first line
> >>> when it
> >>> is a column name. It pretty matches eml semantic.
> >>> Except pipe(|), comma(,) and period(.), HSQLDB also recognises the
> >>> following special indicators for separators:
> >>> \semi - semicolon
> >>> \quote - quote
> >>> \space - space character
> >>> \apos - apostrophe
> >>> \n - newline - Used as an end anchor (like $ in regular
> >>> \r - carriage return
> >>> \t - tab
> >>> \\ - backslash
> >>> \u#### - a Unicode character specified in hexadecimal
> >>> This feature is every good for us to load data into db.
> So I prefer
> >>> to
> >>> use hsqldb.
> >>> Any comments, suggestions are apprecaited.
> >>> Jing
> MJ> --
> MJ> Matt Jones
> jones at nceas.ucsb.edu
> MJ> http://www.nceas.ucsb.edu/ Fax: 425-920-2439 Ph:
> MJ> National Center for Ecological Analysis and Synthesis (NCEAS)
> MJ> University of California Santa Barbara
> MJ> Interested in ecological informatics?
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