Обсуждение: Timestamp precision
We were having difficulty comparing timestamps in postgreSQL, using the jdbc3 driver. However, after reviewing the jdbc driver code, I found that the precision problem I encountered is deliberately coded into the driver. Why is it that the jdbc driver truncates the fractional part of the seconds to 3 decimal places? Thanks for any direction you might be able to offer in this respect.
Greetings.
I need to be able to call the DROP DATABASE database command via JDBC.
Unfortunately I need to kill off any active connections to the specified database before the DROP DATABASE command will work.
Is there anyway from within a JDBC connection to say the template1 database as the superuser on a POSTGRESQL server to:
1. Determine what connections are open and active to a specified database
2. Kill ALL these sessions.
Thank you in advance,
Carl Olivier
Carl, This is not possible through the jdbc interface. Dave On Thu, 2003-03-06 at 04:25, Carl Olivier wrote: > Greetings. > > I need to be able to call the DROP DATABASE database command via JDBC. > > Unfortunately I need to kill off any active connections to the > specified database before the DROP DATABASE command will work. > > Is there anyway from within a JDBC connection to say the template1 > database as the superuser on a POSTGRESQL server to: > > 1. Determine what connections are open and active to a specified > database > 2. Kill ALL these sessions. > > Thank you in advance, > > Carl Olivier -- Dave Cramer <Dave@micro-automation.net>
Hey. Thanks for the reply, although not what I wanted to hear ;) damn! so you mean that I cannot do this except on the actual machine or via a shell script with sufficient permissions?!?! Carl -----Original Message----- From: Dave Cramer [mailto:Dave@micro-automation.net] Sent: 06 March 2003 03:34 PM To: carl@zero-one.co.za Cc: pgsql-jdbc@postgresql.org Subject: Re: [JDBC] SQL Sessions and the DROP DATABASE command Carl, This is not possible through the jdbc interface. Dave On Thu, 2003-03-06 at 04:25, Carl Olivier wrote: > Greetings. > > I need to be able to call the DROP DATABASE database command via JDBC. > > Unfortunately I need to kill off any active connections to the > specified database before the DROP DATABASE command will work. > > Is there anyway from within a JDBC connection to say the template1 > database as the superuser on a POSTGRESQL server to: > > 1. Determine what connections are open and active to a specified > database > 2. Kill ALL these sessions. > > Thank you in advance, > > Carl Olivier -- Dave Cramer <Dave@micro-automation.net>
Well, you could do it within java, but not through the jdbc interface. ie execute a c/shell/whatever program which does it. Dave On Thu, 2003-03-06 at 08:39, Carl Olivier wrote: > Hey. > > Thanks for the reply, although not what I wanted to hear ;) > > damn! > > so you mean that I cannot do this except on the actual machine or via a > shell script with sufficient permissions?!?! > > Carl > > -----Original Message----- > From: Dave Cramer [mailto:Dave@micro-automation.net] > Sent: 06 March 2003 03:34 PM > To: carl@zero-one.co.za > Cc: pgsql-jdbc@postgresql.org > Subject: Re: [JDBC] SQL Sessions and the DROP DATABASE command > > > Carl, > > This is not possible through the jdbc interface. > > Dave > On Thu, 2003-03-06 at 04:25, Carl Olivier wrote: > > Greetings. > > > > I need to be able to call the DROP DATABASE database command via JDBC. > > > > Unfortunately I need to kill off any active connections to the > > specified database before the DROP DATABASE command will work. > > > > Is there anyway from within a JDBC connection to say the template1 > > database as the superuser on a POSTGRESQL server to: > > > > 1. Determine what connections are open and active to a specified > > database > > 2. Kill ALL these sessions. > > > > Thank you in advance, > > > > Carl Olivier > -- > Dave Cramer <Dave@micro-automation.net> -- Dave Cramer <Dave@micro-automation.net>
Daniel, What code are you refering to exactly? I don't see this, and there is a test in the jdbc test suite that tests time out to 6 decimal places. thanks, --Barry Daniel Bruce Lynes wrote: > We were having difficulty comparing timestamps in postgreSQL, using the jdbc3 > driver. However, after reviewing the jdbc driver code, I found that the > precision problem I encountered is deliberately coded into the driver. > > Why is it that the jdbc driver truncates the fractional part of the seconds to > 3 decimal places? > > Thanks for any direction you might be able to offer in this respect. > > ---------------------------(end of broadcast)--------------------------- > TIP 3: if posting/reading through Usenet, please send an appropriate > subscribe-nomail command to majordomo@postgresql.org so that your > message can get through to the mailing list cleanly >
On Thursday 06 March 2003 09:23, Barry Lind wrote: > What code are you refering to exactly? I don't see this, and there is a > test in the jdbc test suite that tests time out to 6 decimal places. Hrm. I downloaded the 7.3.2 code, and the problem doesn't exist in that code. I'll have to take a look at the code I've got at the office. I think it was 7.2.3(?). I downloaded it around December I think. I'll check the version number tomorrow.
On Thursday 06 March 2003 19:22, Daniel Bruce Lynes wrote: > On Thursday 06 March 2003 09:23, Barry Lind wrote: > > What code are you refering to exactly? I don't see this, and there is a > > test in the jdbc test suite that tests time out to 6 decimal places. > > Hrm. I downloaded the 7.3.2 code, and the problem doesn't exist in that > code. I'll have to take a look at the code I've got at the office. I think > it was 7.2.3(?). > > I downloaded it around December I think. I'll check the version number > tomorrow. It was 7.3, and the code was in AbstractJdbc1ResultSet.java.