Re: Object Mapping into sql dbms?
>There are a large number of commercial products available to map java >objects into relatonal databases (I use one called VBSF for some >commercial products). > >But are there any Open Source tools to do this? I am interested in >contributing to such a project as I need it for several open source >projects I have planned. > I know one that is in development for postgresql. Look at http://www.retep.org.uk/postgres/ (map Java objects onto postgresql objects).
Re: Object Mapping into sql dbms?
On Fri, 18 Sep 1998, David Warnock wrote: > There are a large number of commercial products available to map java > objects into relatonal databases (I use one called VBSF for some > commercial products). > > But are there any Open Source tools to do this? I am interested in > contributing to such a project as I need it for several open source > projects I have planned. I added this functionality into the PostgreSQL JDBC driver recently for the next release (6.4 due out Oct 1st, currently in beta). It works if a java object is Serializable, and it's full class name matches the name of a table. ie: mypackage.myclass would map to the table mypackage_myclass. Then when the ResultSet.getObject() or PreparedStatement.setObject() methods are called, the driver uses the Reflection API to do the transfer. It works quite well. The only limitations are that the class/table names are limited to 31 characters, and the 8k tuple limit (although this should be extensible in 6.4 at database creation time). I've just got to find the time between now and the end of the month to finish off the example code and the documentation :-( I wrote this extension because I kept seeing questions on how to perform queries on large objects within the database. I hope that helps. Peter PostgreSQL: http://www.postgresql.org JDBC FAQ: http://www.retep.org.uk/postgres/ -- Peter T Mount [EMAIL PROTECTED] Main Homepage: http://www.retep.org.uk PostgreSQL JDBC Faq: http://www.retep.org.uk/postgres Java PDF Generator: http://www.retep.org.uk/pdf
Re: libmath problem with jdk116v4
Oliver Koell wrote: > Hi, > > i´m using the JDK1.1.6v4 on a SuSE 5.3 distribution. To get it working, > i had to > remove libc.so.5 and libdl.so.1 from the jdk´s lib directory. > > Now i´ve got the following problem: > > > /usr/lib/java/bin/../bin/i686/green_threads/java: can't resolve symbol > '__eprintf' > /usr/lib/java/bin/../bin/i686/green_threads/java: can't resolve symbol > '__eprintf' > /usr/lib/java/bin/../bin/i686/green_threads/java: can't resolve symbol > '__eprintf' > Unable to resolve symbol (libmath.so) > java.lang.UnsatisfiedLinkError: no math in shared library path > at java.lang.Runtime.loadLibrary(Runtime.java) > at java.lang.System.loadLibrary(System.java) > at > > This only happens, when i use a java SSL library - i never encountered > this problem > with other code. > > I´m pretty sure, that libmath.so is in my library search path. Any > ideas, where > ´__eprintf´ is suppose to be found? > > Regards, > > Oliver Has anyone found a solution to or even an idea of what is causing this problem? We are having a similar problem on Slackware 3.4 with one of our programs and have had to revert back to JDK1.1.6v2 libc5. Thanks, K.R. -- K.R. Foley Alwan, Inc. [EMAIL PROTECTED]
java-linux mirror on SunSITE/Denmark
Hi Our mirror of the Java-Linux project has been broken for quite a while here at SunSITE/Denmark. It broke at that time with all the change back and forth to ftp.java-linux.org We would like to be able to offer a mirror of all your good stuff again, but where is the main ftp site ? or where would you prefer us to mirror from ? -- /Esben ([EMAIL PROTECTED]) Just don't create a file called -rf. :-) -- Larry Wall in <[EMAIL PROTECTED]>
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Re: Object Mapping into sql dbms?
Peter T Mount wrote: > > But are there any Open Source tools to do this? I am interested in > > contributing to such a project as I need it for several open source > > projects I have planned. > > I added this functionality into the PostgreSQL JDBC driver recently for > the next release (6.4 due out Oct 1st, currently in beta). > > It works if a java object is Serializable, and it's full class name > matches the name of a table. > > ie: mypackage.myclass would map to the table mypackage_myclass. > > Then when the ResultSet.getObject() or PreparedStatement.setObject() > methods are called, the driver uses the Reflection API to do the transfer. > > It works quite well. The only limitations are that the class/table names > are limited to 31 characters, and the 8k tuple limit (although this should > be extensible in 6.4 at database creation time). Peter, This is very interesting however, it is not really what I am looking for. Postgresql is one the of the dbms we are using via the JDBC driver - and mnay thanks for that. However, I am looking for something a lot more powerful at modelling business objects and mapping them onto tables. The mappings are not simple one object - one table and they also need to support validation, business rules etc. I may decide to buld something and make it available - it would then be able to make use of JINI and JavaSpaces and thus allow distributed business objects. Thanks for your answer and for the work on Postgresql. While I have youn attention can I ask some quick questions about Postgresql. 1. Is there any work being done by anyone on a windows port (for my customers - I am moving to pure linux client and server)? 2. Will 6.4 support Unicode fully when using JDBC? 3. What options and possibilities are there for simple triggers (eg to stop parents being deleted when there are children, keep an invoice total up-to-date etc)? Mnay thanks Dave
jdk in linux
hi I just downloaded the jdk1.1.6 and installed in my linux system. when I try to run "javac" command, it gives me the following error message: /usr/local/jdk1.1.6/bin/../bin/i586/green_threads/javac: /usr/local/jdk1.1.6/bin /../bin/i586/green_threads/java: No such file or directory I think it is related to the .java_wrapper in the bin directory.. could you tell me how to fix this? thanks == --Patrick :-) _ DO YOU YAHOO!? Get your free @yahoo.com address at http://mail.yahoo.com
Re: jdk in linux
> P Q writes: > hi I just downloaded the jdk1.1.6 and installed in my linux system. > when I try to run "javac" command, it gives me the following error > message: /usr/local/jdk1.1.6/bin/../bin/i586/green_threads/javac: > /usr/local/jdk1.1.6/bin /../bin/i586/green_threads/java: No such > file or directory > I think it is related to the .java_wrapper in the bin directory.. Sounds more like a libc5/glibc issue. If you have /lib/libc-2.0.7.so you'll need the glibc version of the JDK, if you *only* have /lib/libc.so.5 you'll need the libc5 version. Jürgen -- Juergen Kreileder, Universitaet Dortmund, Lehrstuhl Informatik V Baroper Strasse 301, D-44221 Dortmund, Germany Phone: ++49 231/755-5806, Fax: ++49 231/755-5802
Re: jdk in linux
> Michael Emmel writes:
> Juergen Kreileder wrote:
>> > P Q writes:
>>
>> > hi I just downloaded the jdk1.1.6 and installed in my linux
>> system.
>>
>> > when I try to run "javac" command, it gives me the following
>> error > message:
>> /usr/local/jdk1.1.6/bin/../bin/i586/green_threads/javac: >
>> /usr/local/jdk1.1.6/bin /../bin/i586/green_threads/java: No such >
>> file or directory
>>
>> > I think it is related to the .java_wrapper in the bin directory..
>>
>> Sounds more like a libc5/glibc issue.
>>
>> If you have /lib/libc-2.0.7.so you'll need the glibc version of the
>> JDK, if you *only* have /lib/libc.so.5 you'll need the libc5
>> version.
> Nope its ap path problem probably running symobilc links that dont
[...]
I don't think so, I've seen many bug reports like this one.
/usr/local/jdk1.1.6/bin/../bin/i586/green_threads/javac:
/usr/local/jdk1.1.6/bin /../bin/i586/green_threads/java: No such file or directory
Note the colon after java ('...threads/java:'). That means that
java (the real binary, not the .java_wrapper) indeed has been found.
The colon means that the error message on the right side of the
colon ('No such ...') is thrown by the application on the left
side of the colon (java).
The error message is incomplete, i.e. the error message doesn't mention
what file or directory has not been found. This only happens if the
missing file is libc.
Try the following command to see if you have the right jdk version:
$ LD_LIBRARY_PATH=/usr/local/jdk1.1.6/lib/i586/green_threads ldd
/usr/local/jdk1.1.6/bin/i586/green_threads/java
On my system it looks like this:
122> LD_LIBRARY_PATH=~/local/jdk-116v4b/lib/i686/green_threads ldd
~/local/jdk-116v4b/bin/i686/green_threads/java
libjava.so =>
/home/kreilede/local/jdk-116v4b/lib/i686/green_threads/libjava.so (0x4000c000)
libm.so.6 => /lib/libm.so.6 (0x40082000)
libdl.so.2 => /lib/libdl.so.2 (0x4009b000)
libawt.so => /home/kreilede/local/jdk-116v4b/lib/i686/green_threads/libawt.so
(0x400a)
libXpm.so.4 => /usr/X11R6/lib/libXpm.so.4 (0x400ea000)
libXt.so.6 => /usr/X11R6/lib/libXt.so.6 (0x400f8000)
libICE.so.6 => /usr/X11R6/lib/libICE.so.6 (0x4014)
libSM.so.6 => /usr/X11R6/lib/libSM.so.6 (0x40155000)
libXext.so.6 => /usr/X11R6/lib/libXext.so.6 (0x4015e000)
libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x4016a000)
libXp.so.6 => /usr/X11R6/lib/libXp.so.6 (0x4020e000)
libc.so.6 => /lib/libc.so.6 (0x40215000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x4000)
Jürgen
--
Juergen Kreileder, Universitaet Dortmund, Lehrstuhl Informatik V
Baroper Strasse 301, D-44221 Dortmund, Germany
Phone: ++49 231/755-5806, Fax: ++49 231/755-5802
