Обсуждение: jdbc large object support ??
I read on the jdbc driver web page that "Stream support for large objects is delayed until 7.1". But I also see an example called ImageViewer.java in the src distribution of postgres that uses large objects. So...... Can I use postgres large objects with the most recent jdbc driver? Anf if so, what is "Stream support" and do I really need it? Thanks, John -- ******************************** ** John Thorhauer ** jthorhauer@phoenixcolor.com ********************************
On Wed, 19 Jul 2000, John Thorhauer wrote: > > I read on the jdbc driver web page that "Stream support for large > objects is delayed until 7.1". But I also see an example called > ImageViewer.java in the src distribution of postgres that uses large > objects. So...... Can I use postgres large objects with the most recent > jdbc driver? Anf if so, what is "Stream support" and do I really need > it? Take a look at the mailing list archive. This question was discussed in great detail during the last couple of days. You use setBytes() and getBytes() instead of streams, for details see the archive. Joachim
Joachim Achtzehnter wrote: > > Take a look at the mailing list archive. This question was discussed in > great detail during the last couple of days. You use setBytes() and > getBytes() instead of streams, for details see the archive. > OK. I looked at that and I saw someone mention something about using the text type to store data. What I am doing is trying to store xml files in postgres. So maybe a field of type "text" willl take care of my needs. What is the size limit on fields of type text? Thanks, John -- ******************************** ** John Thorhauer ** jthorhauer@phoenixcolor.com ********************************
On Wed, 19 Jul 2000, John Thorhauer wrote: > > Joachim Achtzehnter wrote: > > > > Take a look at the mailing list archive. This question was discussed in > > great detail during the last couple of days. You use setBytes() and > > getBytes() instead of streams, for details see the archive. > > > > OK. I looked at that and I saw someone mention something about using > the text type to store data. What I am doing is trying to store xml > files in postgres. Was not referring to the use of the text type, but rather to the lengthy discussion about how one can use Postgresql large objects via JDBC. Just read all of yesterday's messages with "setBytes" or "Blob" in the subject line. This was all about large object (BLOB) support. Joachim
--- Joachim Achtzehnter <joachim@kraut.bc.ca> wrote: > ..... This was all about large object (BLOB) > support. Is the Postgresql large object (BLOB) support including "video file" also ( MPEG, ram etc ) ??? - Pamungkas- __________________________________________________ Do You Yahoo!? Get Yahoo! Mail � Free email you can access from anywhere! http://mail.yahoo.com/
Today, in a message to pgsql-interfaces, S.A.Pamungkas wrote: > > Is the Postgresql large object (BLOB) support > including "video file" also ( MPEG, ram etc ) ??? A BLOB (Binary Large OBject) is a sequence of bytes. Postgresql does not know or care what these bytes mean. Sure, you can store MPEG files if you like. Joachim -- work: joachima@realtimeint.com (http://www.realtimeint.com) private: joachim@kraut.bc.ca (http://www.kraut.bc.ca)
Large Objects have been supported for years - just not via streams. Stream support is simply passing an InputStream (say from a file) directly to a large object in the database. The ImageViewer example shows the other two ways, using setBytes() and using our own extensions. Peter -- Peter Mount Enterprise Support Mushroom Maidstone Borough Council Any views stated are my own, and not those of Maidstone Borough Council -----Original Message----- From: John Thorhauer [mailto:jthorhauer@phoenixcolor.com] Sent: Wednesday, July 19, 2000 9:07 PM To: postgres-inter Subject: [INTERFACES] jdbc large object support ?? I read on the jdbc driver web page that "Stream support for large objects is delayed until 7.1". But I also see an example called ImageViewer.java in the src distribution of postgres that uses large objects. So...... Can I use postgres large objects with the most recent jdbc driver? Anf if so, what is "Stream support" and do I really need it? Thanks, John -- ******************************** ** John Thorhauer ** jthorhauer@phoenixcolor.com ********************************
Peter Mount wrote: > > Large Objects have been supported for years - just not via streams. > > Stream support is simply passing an InputStream (say from a file) directly > to a large object in the database. The ImageViewer example shows the other > two ways, using setBytes() and using our own extensions. I tried the setBytes method and it worked great! Thanks for the help. However, I have another question. If I understand correctly I can use the setBytes() method or the getLargeObjectAPI() method. Is one preferred over the other? Does either have any distinct problems that I should be aware of? I know these are real general questions but I am trying to make sure that I start off going in the right direction with this stuff ;-) Thanks again, John -- ******************************** ** John Thorhauer ** jthorhauer@phoenixcolor.com ********************************
The LargeObject & LargeObjectManager classes implement the actual interface to the large objects. setBytes() actually uses those classes, so in theory using the LargeObject classes would be the better. However, setBytes() is part of the standard JDBC api. Personally I prefer the extension classes, as you gain random access to the BLOB. Peter -- Peter Mount Enterprise Support Mushroom Maidstone Borough Council Any views stated are my own, and not those of Maidstone Borough Council -----Original Message----- From: John Thorhauer [mailto:jthorhauer@phoenixcolor.com] Sent: Thursday, July 20, 2000 12:08 PM To: postgres-inter Subject: Re: [INTERFACES] jdbc large object support ?? Peter Mount wrote: > > Large Objects have been supported for years - just not via streams. > > Stream support is simply passing an InputStream (say from a file) directly > to a large object in the database. The ImageViewer example shows the other > two ways, using setBytes() and using our own extensions. I tried the setBytes method and it worked great! Thanks for the help. However, I have another question. If I understand correctly I can use the setBytes() method or the getLargeObjectAPI() method. Is one preferred over the other? Does either have any distinct problems that I should be aware of? I know these are real general questions but I am trying to make sure that I start off going in the right direction with this stuff ;-) Thanks again, John -- ******************************** ** John Thorhauer ** jthorhauer@phoenixcolor.com ********************************