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Thread: RE: JDBC Problem

RE: JDBC Problem

From
Peter Mount
Date:
What version of the driver are you using?

Versions 6.5.x and earlier used postgresql.Driver but 7.0 onwards uses
org.postgresql.Driver

Peter

-- 
Peter Mount
Enterprise Support Officer, Maidstone Borough Council
Email: petermount@maidstone.gov.uk
WWW: http://www.maidstone.gov.uk
All views expressed within this email are not the views of Maidstone Borough
Council


-----Original Message-----
From: tony [mailto:tony@uickarate.com]
Sent: Thursday, November 16, 2000 2:55 PM
To: pgsql-interfaces
Subject: [INTERFACES] JDBC Problem


I have a problem with loading the JDBC Driver.
So far, my java code does nothing but to load the driver, and
it gives SQLException with message "No suitable driver".
I made the postgresql.jar with 
>make jdbc2
(because I am using jdk1.3)

and I used 
>jar tf postgresql.jar
to make sure that the driver was included.
(postgresql/Driver.class)

My CLASSPATH is following:
:/usr/local/lib/postgresql.jar:/usr/local/jdk1.3/bin/:/home/tony/classes/

I am trying to load the driver by doing
>Class.forName("postgresql.Driver");

This is under linux platform.  Please let me know what could be
wrong if you see anything wrong.


Thanks!

JDBC prob. Continued

From
"tony"
Date:
I'm using 7.0.
Greg told me that SQLException is thrown by
getConnection();
so I've changed by getConnection to
DriverManager.getConnection("jdbc:postgresql:database_name", "postgres",
"password");
and the error changed to something like this:
SQLException: Connection refused.  Check that th ehostname and port is
correct, and
tha thte postmaster is runing with the -i flag, which enables TCP/IP
networking.


Any ideas??

Thanks,

Tony

----- Original Message -----
From: "Peter Mount" <petermount@maidstone.gov.uk>
To: "'tony'" <tony@uickarate.com>; "pgsql-interfaces"
<pgsql-interfaces@postgresql.org>
Sent: Thursday, November 16, 2000 11:14 AM
Subject: RE: [INTERFACES] JDBC Problem


> What version of the driver are you using?
>
> Versions 6.5.x and earlier used postgresql.Driver but 7.0 onwards uses
> org.postgresql.Driver
>
> Peter
>
> --
> Peter Mount
> Enterprise Support Officer, Maidstone Borough Council
> Email: petermount@maidstone.gov.uk
> WWW: http://www.maidstone.gov.uk
> All views expressed within this email are not the views of Maidstone
Borough
> Council
>
>
> -----Original Message-----
> From: tony [mailto:tony@uickarate.com]
> Sent: Thursday, November 16, 2000 2:55 PM
> To: pgsql-interfaces
> Subject: [INTERFACES] JDBC Problem
>
>
> I have a problem with loading the JDBC Driver.
> So far, my java code does nothing but to load the driver, and
> it gives SQLException with message "No suitable driver".
> I made the postgresql.jar with
> >make jdbc2
> (because I am using jdk1.3)
>
> and I used
> >jar tf postgresql.jar
> to make sure that the driver was included.
> (postgresql/Driver.class)
>
> My CLASSPATH is following:
> :/usr/local/lib/postgresql.jar:/usr/local/jdk1.3/bin/:/home/tony/classes/
>
> I am trying to load the driver by doing
> >Class.forName("postgresql.Driver");
>
> This is under linux platform.  Please let me know what could be
> wrong if you see anything wrong.
>
>
> Thanks!
>

Re: JDBC prob. Continued

From
"tony"
Date:
BTW, I have PGOPT="i"
for postgresql.init already.


Tony

----- Original Message -----
From: "tony" <tony@uickarate.com>
To: "pgsql-interfaces" <pgsql-interfaces@postgresql.org>
Sent: Thursday, November 16, 2000 11:23 AM
Subject: [INTERFACES] JDBC prob. Continued


> I'm using 7.0.
> Greg told me that SQLException is thrown by
> getConnection();
> so I've changed by getConnection to
> DriverManager.getConnection("jdbc:postgresql:database_name", "postgres",
> "password");
> and the error changed to something like this:
> SQLException: Connection refused.  Check that th ehostname and port is
> correct, and
> tha thte postmaster is runing with the -i flag, which enables TCP/IP
> networking.
>
>
> Any ideas??
>
> Thanks,
>
> Tony
>
> ----- Original Message -----
> From: "Peter Mount" <petermount@maidstone.gov.uk>
> To: "'tony'" <tony@uickarate.com>; "pgsql-interfaces"
> <pgsql-interfaces@postgresql.org>
> Sent: Thursday, November 16, 2000 11:14 AM
> Subject: RE: [INTERFACES] JDBC Problem
>
>
> > What version of the driver are you using?
> >
> > Versions 6.5.x and earlier used postgresql.Driver but 7.0 onwards uses
> > org.postgresql.Driver
> >
> > Peter
> >
> > --
> > Peter Mount
> > Enterprise Support Officer, Maidstone Borough Council
> > Email: petermount@maidstone.gov.uk
> > WWW: http://www.maidstone.gov.uk
> > All views expressed within this email are not the views of Maidstone
> Borough
> > Council
> >
> >
> > -----Original Message-----
> > From: tony [mailto:tony@uickarate.com]
> > Sent: Thursday, November 16, 2000 2:55 PM
> > To: pgsql-interfaces
> > Subject: [INTERFACES] JDBC Problem
> >
> >
> > I have a problem with loading the JDBC Driver.
> > So far, my java code does nothing but to load the driver, and
> > it gives SQLException with message "No suitable driver".
> > I made the postgresql.jar with
> > >make jdbc2
> > (because I am using jdk1.3)
> >
> > and I used
> > >jar tf postgresql.jar
> > to make sure that the driver was included.
> > (postgresql/Driver.class)
> >
> > My CLASSPATH is following:
> >
:/usr/local/lib/postgresql.jar:/usr/local/jdk1.3/bin/:/home/tony/classes/
> >
> > I am trying to load the driver by doing
> > >Class.forName("postgresql.Driver");
> >
> > This is under linux platform.  Please let me know what could be
> > wrong if you see anything wrong.
> >
> >
> > Thanks!
> >
>
>

Re: JDBC prob. Continued

From
Michael Stephenson
Date:
On Thu, 16 Nov 2000, tony wrote:

> I'm using 7.0.
> Greg told me that SQLException is thrown by
> getConnection();
> so I've changed by getConnection to
> DriverManager.getConnection("jdbc:postgresql:database_name", "postgres",
> "password");
> and the error changed to something like this:
> SQLException: Connection refused.  Check that th ehostname and port is
> correct, and
> tha thte postmaster is runing with the -i flag, which enables TCP/IP
> networking.
> 
> Any ideas??

From reading the error message I'd suggest, either you have the hostname
and port incorrect, correct use is:

DriverManager.getConnection("jdbc:postgresql://[host]:[port]/[db_name]","[username]", "[password]");

Or you're not running postmaster with the -i flag, I use:

postmaster -i -p [port] -D [data directory]

If it's neither of those, then I'm sorry for being patronising.

Hope this helps,

Michael Stephenson

Re: JDBC prob. Continued

From
"tony"
Date:
The host could be just localhost
if this is running only on localhost, right?
Or do I have to specify an IP?

Thanks,


Tony


----- Original Message -----
From: "Michael Stephenson" <mstephenson@tirin.openworld.co.uk>
To: "tony" <tony@uickarate.com>
Cc: "pgsql-interfaces" <pgsql-interfaces@postgresql.org>
Sent: Thursday, November 16, 2000 12:37 PM
Subject: Re: [INTERFACES] JDBC prob. Continued


> On Thu, 16 Nov 2000, tony wrote:
>
> > I'm using 7.0.
> > Greg told me that SQLException is thrown by
> > getConnection();
> > so I've changed by getConnection to
> > DriverManager.getConnection("jdbc:postgresql:database_name", "postgres",
> > "password");
> > and the error changed to something like this:
> > SQLException: Connection refused.  Check that th ehostname and port is
> > correct, and
> > tha thte postmaster is runing with the -i flag, which enables TCP/IP
> > networking.
> >
> > Any ideas??
>
> >From reading the error message I'd suggest, either you have the hostname
> and port incorrect, correct use is:
>
> DriverManager.getConnection(
> "jdbc:postgresql://[host]:[port]/[db_name]",
> "[username]", "[password]");
>
> Or you're not running postmaster with the -i flag, I use:
>
> postmaster -i -p [port] -D [data directory]
>
> If it's neither of those, then I'm sorry for being patronising.
>
> Hope this helps,
>
> Michael Stephenson
>
>

Re: JDBC prob. Continued

From
Christopher Farley
Date:
> so I've changed by getConnection to
> DriverManager.getConnection("jdbc:postgresql:database_name", "postgres",
> "password");

The above URL is not correct, it should be
jdbc:postgresql://localhost:5432/database_name

Note the two slashes after jdbc:postgresql:

I am not sure if localhost:5432 is required, but it won't hurt.

----
Christopher Farley
Northern Brewer / 1150 Grand Avenue / St. Paul, MN 55105
www.northernbrewer.com

RE: JDBC Problem

From
Peter Mount
Date:
What have you got your classpath set to?

-- 
Peter Mount
Enterprise Support Officer, Maidstone Borough Council
Email: petermount@maidstone.gov.uk
WWW: http://www.maidstone.gov.uk
All views expressed within this email are not the views of Maidstone Borough
Council


-----Original Message-----
From: tony [mailto:tony@uickarate.com]
Sent: Thursday, November 16, 2000 3:24 PM
To: pgsql-interfaces
Subject: Re: [INTERFACES] JDBC Problem


Michael,  Peter, Chris,

Thanks for the advice.  I forgot to mention that
I tried org.postgresql.Driver and it didn't work...



Tony

----- Original Message ----- 
From: "Michael Stephenson" <mstephenson@tirin.openworld.co.uk>
To: "tony" <tony@uickarate.com>
Cc: "pgsql-interfaces" <pgsql-interfaces@postgresql.org>
Sent: Thursday, November 16, 2000 11:12 AM
Subject: Re: [INTERFACES] JDBC Problem


> > I am trying to load the driver by doing
> > >Class.forName("postgresql.Driver");
> 
> Try:
> 
> Class.forName("org.postgresql.Driver");
> 
> Hope this helps
> 
> Michael Stephenson
> 
>

Tomcat & JDBC

From
Tony Nakamura
Date:
Thanks everyone for the help on JDBC.  I finally got JDBC to work.
....of course, I am facing an another one.  So please help me if you could.
Thanks in advance.

My DB connection works perfectly when I am writing an application, but
it gives the ClassNotFoundException error when I write a servlet.  I am
pretty
sure it's the setting for tomcat that  I am using.  I have set following in
the tomcat.properties
file:

wrapper.bin.parameters=-Djdbc.drivers=org.postgresql.Driver
wrapper.classpath=/usr/local/lib/postgresql.jar

I am also setting the CLASSPATH environmental variable, so
I've tried wrapper.bin.parameter=NONE and didn't work.


Tony

Re: Tomcat & JDBC

From
Greg Speegle
Date:
I was able to get tomcat to work with postgres by putting the jar file
in /usr/local/tomcat/lib, which is the default place for tomcat to look
for libraries in my installation.

Also, are you using the right jar file? I know you can name it whatever
you want, but the download name I have is jdbc7_0-1_2.jar, while the
old jar file was called postgresql.jar.

Good luck,
Greg Speegle

Tony Nakamura wrote:

> Thanks everyone for the help on JDBC.  I finally got JDBC to work.
> ....of course, I am facing an another one.  So please help me if you could.
> Thanks in advance.
>
> My DB connection works perfectly when I am writing an application, but
> it gives the ClassNotFoundException error when I write a servlet.  I am
> pretty
> sure it's the setting for tomcat that  I am using.  I have set following in
> the tomcat.properties
> file:
>
> wrapper.bin.parameters=-Djdbc.drivers=org.postgresql.Driver
> wrapper.classpath=/usr/local/lib/postgresql.jar
>
> I am also setting the CLASSPATH environmental variable, so
> I've tried wrapper.bin.parameter=NONE and didn't work.
>
> Tony

Re: Tomcat & JDBC

From
Tony Nakamura
Date:
Wow!!  You must be able to see my computer...
It was exactly what's needed.  I guess it was the
typical newbie question??

In anycase, thanks a lot, Greg!!


Tony


Greg Speegle wrote:

> I was able to get tomcat to work with postgres by putting the jar file
> in /usr/local/tomcat/lib, which is the default place for tomcat to look
> for libraries in my installation.
>
> Also, are you using the right jar file? I know you can name it whatever
> you want, but the download name I have is jdbc7_0-1_2.jar, while the
> old jar file was called postgresql.jar.
>
> Good luck,
> Greg Speegle
>
> Tony Nakamura wrote:
>
> > Thanks everyone for the help on JDBC.  I finally got JDBC to work.
> > ....of course, I am facing an another one.  So please help me if you could.
> > Thanks in advance.
> >
> > My DB connection works perfectly when I am writing an application, but
> > it gives the ClassNotFoundException error when I write a servlet.  I am
> > pretty
> > sure it's the setting for tomcat that  I am using.  I have set following in
> > the tomcat.properties
> > file:
> >
> > wrapper.bin.parameters=-Djdbc.drivers=org.postgresql.Driver
> > wrapper.classpath=/usr/local/lib/postgresql.jar
> >
> > I am also setting the CLASSPATH environmental variable, so
> > I've tried wrapper.bin.parameter=NONE and didn't work.
> >
> > Tony

currval() problem

From
"tony"
Date:
Hello

I have a problem with currval() through JDBC.  
My nextval() updates the counter of sequences, but
currval() returns no value even after I call nextval().
Both work fine when I try them through psql.  
Have you encountered this problem before??


Tony

Re: currval() problem

From
Marko Kreen
Date:
On Tue, Nov 28, 2000 at 08:16:08PM -0500, tony wrote:
> Hello
> 
> I have a problem with currval() through JDBC.  
> My nextval() updates the counter of sequences, but
> currval() returns no value even after I call nextval().
> Both work fine when I try them through psql.  
> Have you encountered this problem before??

does this help?
con.setAutoCommit(false);

-- 
marko