Обсуждение: JBuilder4 ...
I have a problem when I use JDBC Explorer. In some cases it don't return
the errors.
par example:
select * frum table
^^^^^^
It is a bug or a feature ?
Quoting Catalin CIOCOIU <catalin.ciocoiu@inpg.fr>: > I have a problem when I use JDBC Explorer. In some cases it don't > return > the errors. > par example: > select * frum table > ^^^^^^ > > It is a bug or a feature ? I'll try it from here in a moment, but I'd say it's a JBuilder bug. The backend should throw a wobbly when it parses the query, and JDBC should then throw SQLException. Unless JBuilder is expecting too much from JDBC or they've caught the exception and ditching it.... Peter -- Peter Mount peter@retep.org.uk PostgreSQL JDBC Driver: http://www.retep.org.uk/postgres/ RetepPDF PDF library for Java: http://www.retep.org.uk/pdf/
On Tue, 6 Mar 2001, Peter T Mount wrote: > Quoting Catalin CIOCOIU <catalin.ciocoiu@inpg.fr>: > > > I have a problem when I use JDBC Explorer. In some cases it don't > > return > > the errors. > > par example: > > select * frum table > > ^^^^^^ > > > > It is a bug or a feature ? > > I'll try it from here in a moment, but I'd say it's a JBuilder bug. The backend > should throw a wobbly when it parses the query, and JDBC should then throw > SQLException. Unless JBuilder is expecting too much from JDBC or they've caught > the exception and ditching it.... 'a wobbly'? JBDC technical term here? :)
Quoting The Hermit Hacker <scrappy@hub.org>: > On Tue, 6 Mar 2001, Peter T Mount wrote: > > > Quoting Catalin CIOCOIU <catalin.ciocoiu@inpg.fr>: > > > > > I have a problem when I use JDBC Explorer. In some cases it don't > > > return > > > the errors. > > > par example: > > > select * frum table > > > ^^^^^^ > > > > > > It is a bug or a feature ? > > > > I'll try it from here in a moment, but I'd say it's a JBuilder bug. > The backend > > should throw a wobbly when it parses the query, and JDBC should then > throw > > SQLException. Unless JBuilder is expecting too much from JDBC or > they've caught > > the exception and ditching it.... > > 'a wobbly'? JBDC technical term here? :) hehe, no probably an English term meaning "to complain, loose it's temper/patience" etc ;-) Anyhow, I've just tried it with my JBuilder install (latest CVS of JDBC but a beta3 backend) and it complains nicely. I'm not sure why Catalin isn't seeing the exceptions... Peter -- Peter Mount peter@retep.org.uk PostgreSQL JDBC Driver: http://www.retep.org.uk/postgres/ RetepPDF PDF library for Java: http://www.retep.org.uk/pdf/
On Tue, 6 Mar 2001, Peter T Mount wrote: > Quoting The Hermit Hacker <scrappy@hub.org>: > > > On Tue, 6 Mar 2001, Peter T Mount wrote: > > > > > Quoting Catalin CIOCOIU <catalin.ciocoiu@inpg.fr>: > > > > > > > I have a problem when I use JDBC Explorer. In some cases it don't > > > > return > > > > the errors. > > > > par example: > > > > select * frum table > > > > ^^^^^^ > > > > > > > > It is a bug or a feature ? > > > > > > I'll try it from here in a moment, but I'd say it's a JBuilder bug. > > The backend > > > should throw a wobbly when it parses the query, and JDBC should then > > throw > > > SQLException. Unless JBuilder is expecting too much from JDBC or > > they've caught > > > the exception and ditching it.... > > > > 'a wobbly'? JBDC technical term here? :) > > hehe, no probably an English term meaning "to complain, loose it's > temper/patience" etc ;-) Should get this as part of one of the exceptions? :) "I Wobbled, please fix me"? :)
I have JBuilder4 French version. I see some errors. Par example if mistake the table name, I got an exception. It is very strange ! Peter T Mount wrote: > > Quoting The Hermit Hacker <scrappy@hub.org>: > > > On Tue, 6 Mar 2001, Peter T Mount wrote: > > > > > Quoting Catalin CIOCOIU <catalin.ciocoiu@inpg.fr>: > > > > > > > I have a problem when I use JDBC Explorer. In some cases it don't > > > > return > > > > the errors. > > > > par example: > > > > select * frum table > > > > ^^^^^^ > > > > > > > > It is a bug or a feature ? > > > > > > I'll try it from here in a moment, but I'd say it's a JBuilder bug. > > The backend > > > should throw a wobbly when it parses the query, and JDBC should then > > throw > > > SQLException. Unless JBuilder is expecting too much from JDBC or > > they've caught > > > the exception and ditching it.... > > > > 'a wobbly'? JBDC technical term here? :) > > hehe, no probably an English term meaning "to complain, loose it's > temper/patience" etc ;-) > > Anyhow, I've just tried it with my JBuilder install (latest CVS of JDBC but a > beta3 backend) and it complains nicely. I'm not sure why Catalin isn't seeing > the exceptions... > > Peter > > -- > Peter Mount peter@retep.org.uk > PostgreSQL JDBC Driver: http://www.retep.org.uk/postgres/ > RetepPDF PDF library for Java: http://www.retep.org.uk/pdf/
Does anyone know that if the pgsql-jdbc driver has connection pooling built in, or I must write one for myself?
Qiqi Dong wrote: > > Does anyone know that if the pgsql-jdbc driver has connection pooling built > in, or I must write one for myself? > Just write one yourself. Use a Stack(). Or you could use protomater: http://protomatter.sourceforge.net/ -- Joseph Shraibman jks@selectacast.net Increase signal to noise ratio. http://www.targabot.com
On Wed, 7 Mar 2001, Joseph Shraibman wrote: > Qiqi Dong wrote: > > > > Does anyone know that if the pgsql-jdbc driver has connection pooling built > > in, or I must write one for myself? > > > Just write one yourself. Use a Stack(). > > Or you could use protomater: http://protomatter.sourceforge.net/ Or Poolman: http://poolman.sourceforge.net/ -- Richard Bullington-McGuire <rbulling@microstate.com> Chief Technology Officer, The Microstate Corporation Phone: 703-796-6446 URL: http://www.microstate.com/ PGP key IDs: RSA: 0x93862305 DH/DSS: 0xDAC3028E
Richard Bullington-McGuire <rbulling@microstate.com> writes: > > > > Or you could use protomater: http://protomatter.sourceforge.net/ > > Or Poolman: http://poolman.sourceforge.net/ > Just to be lame; there is a gazillion different free implementations out there, for a good one try the one you find as part of the appserver at locomotive.org, for painfull one try the one in Turbine from the Java apache project. Of course your milage may vary, but this is not really a pgsql related question... ;-D Unless of course we are talking about implementing pooling for the DataSource class, but that is somewhat unrelated as well... Hugs and kisses, Gunnar
On 9 Mar 2001, Gunnar R|nning wrote:
> [snip] Of course your milage may vary, but this is not really a pgsql
> related question... ;-D Unless of course we are talking about implementing
> pooling for the DataSource class, but that is somewhat unrelated as well...
That's something that I'm a bit confused about -- there is very little
documentation on the DataSource class in the sources. One comment in
particular confuses me:
/**
* This is a pool of free underlying JDBC connections. If two
* XA connections are used in the same transaction, the second
* one will make its underlying JDBC connection available to
* the pool. This is not a real connection pool, only a marginal
* efficiency solution for dealing with shared transactions.
*/
This is not a real connection pool?
It seems to me that the JavaDoc for this class should be expanded to
explain more just what kind of pool it provides.
--
Richard Bullington-McGuire <rbulling@microstate.com>
Chief Technology Officer, The Microstate Corporation
Phone: 703-796-6446 URL: http://www.microstate.com/
PGP key IDs: RSA: 0x93862305 DH/DSS: 0xDAC3028E
Richard Bullington-McGuire wrote: > > On 9 Mar 2001, Gunnar R|nning wrote: > > > [snip] Of course your milage may vary, but this is not really a pgsql > > related question... ;-D Unless of course we are talking about implementing > > pooling for the DataSource class, but that is somewhat unrelated as well... > > That's something that I'm a bit confused about -- there is very little > documentation on the DataSource class in the sources. One comment in > particular confuses me: > > /** > * This is a pool of free underlying JDBC connections. If two > * XA connections are used in the same transaction, the second > * one will make its underlying JDBC connection available to > * the pool. This is not a real connection pool, only a marginal > * efficiency solution for dealing with shared transactions. > */ > > This is not a real connection pool? > > It seems to me that the JavaDoc for this class should be expanded to > explain more just what kind of pool it provides. It's a connection sharing pool. If two JDBC Connection objects are used in the same transaction, they will need to use the same underlying connection, since there's not support for the XA API. When performing asynchronous commit, the connection will be put aside until it commits, and the JDBC Connection object might need to use a different underlying connection. Because of all this connection switching logic, I've implemented a very simple connection pool that is just used to recycle the underlying JDBC connection across many client-side JDBC connections. It's not a full connection pool. If you are looking for a fully featured connection pool, see http://tyrex.exolab.org. arkin > > -- > Richard Bullington-McGuire <rbulling@microstate.com> > Chief Technology Officer, The Microstate Corporation > Phone: 703-796-6446 URL: http://www.microstate.com/ > PGP key IDs: RSA: 0x93862305 DH/DSS: 0xDAC3028E -- ---------------------------------------------------------------------- Assaf Arkin arkin@intalio.com CTO, Intalio Inc. www.intalio.com The Business Process Management Company (650) 345 2777