Обсуждение: SQL solution for my JDBC timezone issue
Anyone have a suggestion for setting the timezone back to the Postgres db default on a connection. JDBC now sets the timezone to be the client which is my web server and ignores the default timezone that I have set in the DB. There are large parts of my code that I have never worried about timezones because the DB would handle it. Before I head down that path, I thought I would check and see if there was an easier way for me to put it back into the database.
My latest issue is I create a date object and set it to 3am PST, If I save it into a timestamp with timezone the db saves it at 3am PST when I pull it out. If I save it to timestamp without timezone, I get 6am now where as before I would get 3am.
Any suggestions would be appreciated
George Woodring
iGLASS Networks
www.iglass.net
www.iglass.net
Well you could always just put it back to whatever you want when you open the connection ie "set timezone ...."
On 23 February 2015 at 08:40, George Woodring <george.woodring@iglass.net> wrote:
Anyone have a suggestion for setting the timezone back to the Postgres db default on a connection. JDBC now sets the timezone to be the client which is my web server and ignores the default timezone that I have set in the DB. There are large parts of my code that I have never worried about timezones because the DB would handle it. Before I head down that path, I thought I would check and see if there was an easier way for me to put it back into the database.My latest issue is I create a date object and set it to 3am PST, If I save it into a timestamp with timezone the db saves it at 3am PST when I pull it out. If I save it to timestamp without timezone, I get 6am now where as before I would get 3am.Any suggestions would be appreciatedGeorge WoodringiGLASS Networks
www.iglass.net
Yes, that is where we think we are heading, the issue is that the code does not know what it needs to be set back to. We have 90 databases with 5 different time zones. I was just hoping for a more elegant solution than writing a lookup table that says if you are connecting to db x then set to timezone y.
George Woodring
iGLASS Networks
www.iglass.net
www.iglass.net
On Mon, Feb 23, 2015 at 9:16 AM, Dave Cramer <pg@fastcrypt.com> wrote:
Well you could always just put it back to whatever you want when you open the connection ie "set timezone ...."On 23 February 2015 at 08:40, George Woodring <george.woodring@iglass.net> wrote:Anyone have a suggestion for setting the timezone back to the Postgres db default on a connection. JDBC now sets the timezone to be the client which is my web server and ignores the default timezone that I have set in the DB. There are large parts of my code that I have never worried about timezones because the DB would handle it. Before I head down that path, I thought I would check and see if there was an easier way for me to put it back into the database.My latest issue is I create a date object and set it to 3am PST, If I save it into a timestamp with timezone the db saves it at 3am PST when I pull it out. If I save it to timestamp without timezone, I get 6am now where as before I would get 3am.Any suggestions would be appreciatedGeorge WoodringiGLASS Networks
www.iglass.net
Timestamps have always been a bit of a pain since JDBC does not support both with and without timezones. It really only supports timestamps with timezone.
We have made decisions in the driver which are not optimal for everyone. The reason it does this is for binary transfers of data. We need to control which timezone both the server and the client are operating in.
I'm open to suggestions ?
On 23 February 2015 at 10:42, George Woodring <george.woodring@iglass.net> wrote:
Yes, that is where we think we are heading, the issue is that the code does not know what it needs to be set back to. We have 90 databases with 5 different time zones. I was just hoping for a more elegant solution than writing a lookup table that says if you are connecting to db x then set to timezone y.George WoodringiGLASS Networks
www.iglass.netOn Mon, Feb 23, 2015 at 9:16 AM, Dave Cramer <pg@fastcrypt.com> wrote:Well you could always just put it back to whatever you want when you open the connection ie "set timezone ...."On 23 February 2015 at 08:40, George Woodring <george.woodring@iglass.net> wrote:Anyone have a suggestion for setting the timezone back to the Postgres db default on a connection. JDBC now sets the timezone to be the client which is my web server and ignores the default timezone that I have set in the DB. There are large parts of my code that I have never worried about timezones because the DB would handle it. Before I head down that path, I thought I would check and see if there was an easier way for me to put it back into the database.My latest issue is I create a date object and set it to 3am PST, If I save it into a timestamp with timezone the db saves it at 3am PST when I pull it out. If I save it to timestamp without timezone, I get 6am now where as before I would get 3am.Any suggestions would be appreciatedGeorge WoodringiGLASS Networks
www.iglass.net
George Woodring <george.woodring@iglass.net> writes:
> Yes, that is where we think we are heading, the issue is that the code does
> not know what it needs to be set back to. We have 90 databases with 5
> different time zones. I was just hoping for a more elegant solution than
> writing a lookup table that says if you are connecting to db x then set to
> timezone y.
"RESET timezone" ?
regards, tom lane
For posterity please be aware this will very likely break any timestamps transfer using JDBC and binary transfer.
This is not recommended for general consumption
On 23 February 2015 at 10:49, Tom Lane <tgl@sss.pgh.pa.us> wrote:
George Woodring <george.woodring@iglass.net> writes:
> Yes, that is where we think we are heading, the issue is that the code does
> not know what it needs to be set back to. We have 90 databases with 5
> different time zones. I was just hoping for a more elegant solution than
> writing a lookup table that says if you are connecting to db x then set to
> timezone y.
"RESET timezone" ?
regards, tom lane
This is what I was looking for, however the JDBC does something to make its timezone the default.
My cluster is set to GMT, I have a DB that is set to US/Pacific, when I get the connection from JDBC it is US/Eastern. The reset command does not affect it. I can set timezone in the code to 'US/Pacific" and I see it change, when I do another RESET timezone it goes back to US/Eastern.
Thanks,
George Woodring
iGLASS Networks
www.iglass.net
www.iglass.net
On Mon, Feb 23, 2015 at 10:49 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
George Woodring <george.woodring@iglass.net> writes:
> Yes, that is where we think we are heading, the issue is that the code does
> not know what it needs to be set back to. We have 90 databases with 5
> different time zones. I was just hoping for a more elegant solution than
> writing a lookup table that says if you are connecting to db x then set to
> timezone y.
"RESET timezone" ?
regards, tom lane
On 02/23/2015 12:15 PM, George Woodring wrote: > This is what I was looking for, however the JDBC does something to make > its timezone the default. > > My cluster is set to GMT, I have a DB that is set to US/Pacific, when I > get the connection from JDBC it is US/Eastern. The reset command does > not affect it. I can set timezone in the code to 'US/Pacific" and I see > it change, when I do another RESET timezone it goes back to US/Eastern. In your original post you mentioned that access to the databases is through a Web server. Is there just one Web server with one time zone? > > Thanks, > George Woodring > > iGLASS Networks > www.iglass.net <http://www.iglass.net> > > On Mon, Feb 23, 2015 at 10:49 AM, Tom Lane <tgl@sss.pgh.pa.us > <mailto:tgl@sss.pgh.pa.us>> wrote: > > George Woodring <george.woodring@iglass.net > <mailto:george.woodring@iglass.net>> writes: > > Yes, that is where we think we are heading, the issue is that the code does > > not know what it needs to be set back to. We have 90 databases with 5 > > different time zones. I was just hoping for a more elegant solution than > > writing a lookup table that says if you are connecting to db x then set to > > timezone y. > > "RESET timezone" ? > > regards, tom lane > > -- Adrian Klaver adrian.klaver@aklaver.com
George,
Everytime you get a connection the driver will issue set timezone ...
It does not change the default time zone for the server (AFAICS)
On 23 February 2015 at 15:29, Adrian Klaver <adrian.klaver@aklaver.com> wrote:
On 02/23/2015 12:15 PM, George Woodring wrote:This is what I was looking for, however the JDBC does something to make
its timezone the default.
My cluster is set to GMT, I have a DB that is set to US/Pacific, when I
get the connection from JDBC it is US/Eastern. The reset command does
not affect it. I can set timezone in the code to 'US/Pacific" and I see
it change, when I do another RESET timezone it goes back to US/Eastern.
In your original post you mentioned that access to the databases is through a Web server.
Is there just one Web server with one time zone?
Thanks,
George Woodring
iGLASS Networks
www.iglass.net <http://www.iglass.net>
On Mon, Feb 23, 2015 at 10:49 AM, Tom Lane <tgl@sss.pgh.pa.us
<mailto:tgl@sss.pgh.pa.us>> wrote:
George Woodring <george.woodring@iglass.net
<mailto:george.woodring@iglass.net>> writes:
> Yes, that is where we think we are heading, the issue is that the code does
> not know what it needs to be set back to. We have 90 databases with 5
> different time zones. I was just hoping for a more elegant solution than
> writing a lookup table that says if you are connecting to db x then set to
> timezone y.
"RESET timezone" ?
regards, tom lane
--
Adrian Klaver
adrian.klaver@aklaver.com
Dave Cramer <pg@fastcrypt.com> writes:
> Everytime you get a connection the driver will issue set timezone ...
> It does not change the default time zone for the server (AFAICS)
Hmm ... depending on exactly how you issue it, it might become the default
for the session, I think. I seem to recall that parameter settings
included in the startup packet become session-lifespan defaults. If you
issued the SET as a separate command then a RESET ought to undo it.
regards, tom lane
On 23 February 2015 at 16:31, Tom Lane <tgl@sss.pgh.pa.us> wrote:
Dave Cramer <pg@fastcrypt.com> writes:
> Everytime you get a connection the driver will issue set timezone ...
> It does not change the default time zone for the server (AFAICS)
Hmm ... depending on exactly how you issue it, it might become the default
for the session, I think. I seem to recall that parameter settings
included in the startup packet become session-lifespan defaults. If you
issued the SET as a separate command then a RESET ought to undo it.
That would explain it then as they are issued in the startup command
-- In your original post you mentioned that access to the databases is through a Web server.
-- Is there just one Web server with one time zone?
-- Is there just one Web server with one time zone?
We have 2 web servers that are clustered together. They are both set to Eastern since that is the timezone they are located in.
George,
One solution for you might be to write a C function which gets the OS timezone and then you can execute set timezone=server_timezone();
On 24 February 2015 at 09:25, George Woodring <george.woodring@iglass.net> wrote:
-- In your original post you mentioned that access to the databases is through a Web server.
-- Is there just one Web server with one time zone?We have 2 web servers that are clustered together. They are both set to Eastern since that is the timezone they are located in.
On 02/24/2015 06:25 AM, George Woodring wrote:
> -- In your original post you mentioned that access to the databases is
> through a Web server.
>
> -- Is there just one Web server with one time zone?
>
> We have 2 web servers that are clustered together. They are both set to
> Eastern since that is the timezone they are located in.
>
So:
JDBC Web servers(US/East) <---> 90 database (5 different timezones)
Therefore everything to the end user is passed through the Web servers?
Is there a reason why the databases have different timezones?
Seems to me less complicated to have all the databases share the UTC
timezone. Then you only have one offset, US/East <--> UTC.
> iGLASS Networks
> www.iglass.net <http://www.iglass.net>
>
>
--
Adrian Klaver
adrian.klaver@aklaver.com
So:
JDBC Web servers(US/East) <---> 90 database (5 different timezones)
Therefore everything to the end user is passed through the Web servers?
Is there a reason why the databases have different timezones?
Seems to me less complicated to have all the databases share the UTC timezone. Then you only have one offset, US/East <--> UTC.
On 25/02/15 04:29, Adrian Klaver wrote: > On 02/24/2015 06:25 AM, George Woodring wrote: >> -- In your original post you mentioned that access to the databases is >> through a Web server. >> >> -- Is there just one Web server with one time zone? >> >> We have 2 web servers that are clustered together. They are both set to >> Eastern since that is the timezone they are located in. >> > > > So: > > JDBC Web servers(US/East) <---> 90 database (5 different timezones) > > Therefore everything to the end user is passed through the Web servers? > > Is there a reason why the databases have different timezones? > > Seems to me less complicated to have all the databases share the UTC > timezone. Then you only have one offset, US/East <--> UTC. > >> iGLASS Networks >> www.iglass.net <http://www.iglass.net> >> >> > > Yes I think it sanest to have servers use GMT*, as then it is simple enough to convert results to whatever local time zone the client is in. I live in New Zealand, and we are offset from GMT about 12 hours (depend on seasonal adjustments). Have no problem getting query results using my local time zone automatically. - regardless of whether I query from the database box or another, using psql! Cheers, Gavin *UTC or whatever it is currently fashionable to call it! :-)
On 02/24/2015 11:36 AM, Gavin Flower wrote: > On 25/02/15 04:29, Adrian Klaver wrote: >> On 02/24/2015 06:25 AM, George Woodring wrote: >>> -- In your original post you mentioned that access to the databases is >>> through a Web server. >>> >>> -- Is there just one Web server with one time zone? >>> >>> We have 2 web servers that are clustered together. They are both set to >>> Eastern since that is the timezone they are located in. >>> >> >> >> So: >> >> JDBC Web servers(US/East) <---> 90 database (5 different timezones) >> >> Therefore everything to the end user is passed through the Web servers? >> >> Is there a reason why the databases have different timezones? >> >> Seems to me less complicated to have all the databases share the UTC >> timezone. Then you only have one offset, US/East <--> UTC. >> >>> iGLASS Networks >>> www.iglass.net <http://www.iglass.net> >>> >>> >> >> > Yes I think it sanest to have servers use GMT*, as then it is simple > enough to convert results to whatever local time zone the client is in. > > I live in New Zealand, and we are offset from GMT about 12 hours (depend > on seasonal adjustments). Have no problem getting query results using > my local time zone automatically. - regardless of whether I query from > the database box or another, using psql! > > > Cheers, > Gavin > > > *UTC or whatever it is currently fashionable to call it! :-) Depends on which side of the Channel you want to make happy:) -- Adrian Klaver adrian.klaver@aklaver.com