1. Upon logging to *SQL shell* the following is being displayed:
*Server [localhost]:*
*Database [postgres]:*
*Port [5432]:*
*Username [postgres]:*
*psql (9.0.4)*
*WARNING: Console code page (437) differs from Windows code page (1252)*
* 8-bit characters might not work correctly. See psql reference*
* page "Notes for Windows users" for details.*
*Type "help" for help.*
*
*
Where do I find the mentioned article?
*
*
2. When running a test program, sourced from Core Java Volume 2 (7th
Edition), the following error is being displayed:
*java.sql.SQLException: No suitable driver found for
jdbc:postgresql:COREJAVA;cre*
*ate=true*
* at java.sql.DriverManager.getConnection(DriverManager.java:602)*
* at java.sql.DriverManager.getConnection(DriverManager.java:185)*
* at TestDB.getConnection(TestDB.java:82)*
* at TestDB.runTest(TestDB.java:43)*
* at TestDB.main(TestDB.java:20)*
*
*
In order to enable JDK to connect to the library files, I copied over *
postgresql-8.4-702.jdbc3.jar*, and,
*postgresql-8.4-702.jdbc4.jar* to *C:\Program Files\Java\jre6\lib\ext*.
It was assumed that the file naming indicates type 3 and type 4
respectively, and, I was intending to use type 4, since it is more efficient
to use a library that translates Java to the database language for Postgre:
*postgresql-8.4-702.jdbc3.jar*
A type 3 driver is a pure Java client library that uses a
database-independent protocol to communicate database requests to a server
component, which then translates the requests into a database-specific
protocol. This can simplify deployment since the database-dependent code is
located only on the server.
*postgresql-8.4-702.jdbc4.jar*
A type 4 driver is a pure Java library that translates JDBC requests
directly to a database-specific protocol.
*TestDB.java*
/**
@version 1.01 2004-09-24
@author Cay Horstmann (all rights reserved)
*/
import java.sql.*;
import java.io.*;
import java.util.*;
/**
This program tests that the database and the JDBC
driver are correctly configured.
*/
class TestDB
{
public static void main (String args[])
{
try
{
runTest();
}
catch (SQLException ex)
{
while (ex != null)
{
ex.printStackTrace();
ex = ex.getNextException();
}
}
catch (IOException ex)
{
ex.printStackTrace();
}
}
/**
Runs a test by creating a table, adding a value, showing the table
contents, and
removing the table.
*/
public static void runTest()
throws SQLException, IOException
{
Connection conn = getConnection();
try
{
Statement stat = conn.createStatement();
stat.execute("CREATE TABLE Greetings (Message CHAR(20))");
stat.execute("INSERT INTO Greetings VALUES ('Hello, World!')");
ResultSet result = stat.executeQuery("SELECT * FROM Greetings");
result.next();
System.out.println(result.getString(1));
stat.execute("DROP TABLE Greetings");
}
finally
{
conn.close();
}
}
/**
Gets a connection from the properties specified
in the file database.properties
@return the database connection
*/
public static Connection getConnection()
throws SQLException, IOException
{
Properties props = new Properties();
FileInputStream in = new FileInputStream("database.properties");
props.load(in);
in.close();
String drivers = props.getProperty("jdbc.drivers");
if (drivers != null)
System.setProperty("jdbc.drivers", drivers);
String url = props.getProperty("jdbc.url");
String username = props.getProperty("jdbc.username");
String password = props.getProperty("jdbc.password");
return DriverManager.getConnection(url, username, password);
}
}
*database.properties*
dbc.drivers=org.postgresql.Driver
jdbc.url=jdbc:postgresql:COREJAVA;create=true
jdbc.username=postgre
jdbc.password=
*command line*
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\Jon>echo %CLASSPATH%
.;.;C:\PROGRA~1\JMF21~1.1E\lib\sound.jar;C:\PROGRA~1\JMF21~1.1E\lib\jmf.jar;C:\P
ROGRA~1\JMF21~1.1E\lib;C:\Program
Files\Java\external_jars\junit4.9b2\junit4.9b2
\junit-4.9b2.jar;*C:\Program Files\PostgreSQL\pgJDBC;*
C:\Documents and Settings\Jon>cd c:\Program Files\PostgreSQL\pgJDBC
C:\Program Files\PostgreSQL\pgJDBC>dir
Volume in drive C has no label.
Volume Serial Number is D80F-8634
Directory of C:\Program Files\PostgreSQL\pgJDBC
09/07/2011 15:42 <DIR> .
09/07/2011 15:42 <DIR> ..
03/04/2011 23:22 502,118 postgresql-8.4-702.jdbc3.jar
03/04/2011 23:22 539,510 *postgresql-8.4-702.jdbc4.jar*
09/07/2011 15:42 <DIR> scripts
09/07/2011 15:42 5,759,102 uninstall-pgjdbc.exe
3 File(s) 6,800,730 bytes
3 Dir(s) 37,139,398,656 bytes free
C:\Program Files\PostgreSQL\pgJDBC>
How can I get the program running?
--
Jonathan Camilleri
Mobile (MT): 00356 7982 7113
E-mail: camilleri....@gmail.com
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