Re: Still baffled by a CONNECTion problem - Mailing list pgsql-jdbc
From | Dave Cramer |
---|---|
Subject | Re: Still baffled by a CONNECTion problem |
Date | |
Msg-id | 7802F6D7-4F91-4327-988B-1006EEEADC34@fastcrypt.com Whole thread Raw |
In response to | Still baffled by a CONNECTion problem ("Peter Cook" <ttpcook@hotmail.com>) |
List | pgsql-jdbc |
Peter, 1) You need to specify the jar in the classpath, not just the directory. ie CLASSPATH=...;C:\Program Files\PostgreSQL\8.0\jdbc \postgresql-8.0-311.jdbc3.jar 2) locate the postgresql.conf file and edit this to enable a connection to be made, I believe you need to change listen_address to '*' Dave On 8-Oct-05, at 3:34 AM, Peter Cook wrote: > It appears my first appeal for help wasn’t clear enough. > > I want to connect my Java Application running on Windows 2000 to my > postgresql database. > > From what I understand and have read there are AT LEAST 2 things I > need to do. > > (1) Have the application load the relevant JDBC driver and > > (2) Make a connection. > > With respect to (1), despite numerous attempts I have been unable > to resolve the ClassNotFound exception. > > I have set the CLASSPATH environment variable as follows: > %SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C: > \PROGRA~1\ULTRAE~1;C:\Program Files\Java\jdk1.5.0_04\bin;C:\Program > Files\PostgreSQL\8.0\jdbc > > I have written some test code in Java to load the Driver, as follows: > public void displayClasspath() > { > String driverPath = "C:\\Program Files\\PostgreSQL\\8.0\ > \jdbc"; > String classpath = System.getProperty("java.class.path"); > _displayTextArea.append("Classpath = " + classpath + "\n"); > > classpath = classpath + ";" + driverPath + "\ > \postgresql-8.0-311.jdbc3.jar"; > System.setProperty("java.class.path", classpath); > _displayTextArea.append("Classpath = " + classpath + "\n"); > > System.setProperty("jdbc.drivers", driverPath); > String drivers = System.getProperty("jdbc.drivers"); > _displayTextArea.append("Drivers = " + drivers + "\n"); > > // 1. Load the jdbc.odbc database driver class > try > { > File driverDir = new File(driverPath); > if ( driverDir.isDirectory() ) > _displayTextArea.append("DriverDir is a directory \n"); > else > _displayTextArea.append("DriverDir is NOT a > directory \n"); > > File dFile = new File(driverPath + "\\org\\postgresql\ > \Driver.class"); > if ( dFile.isFile() ) > _displayTextArea.append("Driver is a file \n"); > else > _displayTextArea.append("Driver is NOT a file \n"); > > String driver = "org.postgresql.Driver"; > driverPath = driverPath + "\\" + driver; > > Class.forName(driver); > } > catch (ClassNotFoundException cnfe) > { > System.out.println("ClassNotFoundException."); > } > } > > The output from this code is as follows: > Classpath = C:\Eclipse\Workspace\Test > Classpath = C:\Eclipse\Workspace\Test;C:\Program Files\PostgreSQL > \8.0\jdbc\postgresql-8.0-311.jdbc3.jar > Drivers = C:\Program Files\PostgreSQL\8.0\jdbc > DriverDir is a directory > Driver is a file > > So: > - for some unknown reason my Eclipse editor has reset my CLASSPATH > - but despite this I am able to programmatically adjust the > CLASSPATH property to suit > - Java recognized the directory where I have installed the JAR file > as a valid directory and is able to locate the relevant driver file > > WHY WON’T IT LOAD the DRIVER????? > > > With respect to (2) creating a connection. > From what I have read I need to set the PostMaster to run with a “- > I” flag to enable TCP/IP communication. > However the Postmaster is started somewhere in the boot sequence, > and I don’t know how to adjust it’s startup. > > HOW DO I DO THIS? > > > IS THERE SOMETHING ELSE I NEED TO DO??? > > I think I can work out the connection parameters and make the > connection IF I CAN RESOLVE THESE QUESTIONS. > > Yours Sincerely > > Peter Cook > > _________________________________________________________________ > REALESTATE: biggest buy/rent/share listings http:// > ninemsn.realestate.com.au > > > ---------------------------(end of > broadcast)--------------------------- > TIP 6: explain analyze is your friend > >
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