Re: Hello World

Andreas wrote:
> Hi,
>
> first of all I'll have to confess I don't know next to nothing at all
> about JAVA, yet.
> On the other hand I'm not exactly new to programming nor PostgreSQL either.
>
> Is there a "Hello World" level sample for jdbc with PG?

I'd suggest to read the Java Tutorial by Sun:

http://java.sun.com/docs/books/tutorial/

and after you got the basics, move on to the JDBC trail of the tutorial:

http://java.sun.com/docs/books/tutorial/jdbc/index.html

> Lets suppose I allready have a running PG with a db db_test that has a
> few tables among which there is tbl_test in schema s.
> The db-server might be 192.168.0.100.
> User could be "user1" with password "pw1".
>
> What would be minimally needed to connect to db_test and read the
> content of tbl_test to the console and logg off from PG.
>
> I'd prefer a complete sample code that could be dumped through javac.

A sample attached. Save it to a file called JdbcTest.java, modify the
server address, database name, table name etc. to suite your needs, and
compile with "javac JdbcTest.java". To run, add postgresql.jar to your
classpath. For example:

java -cp path/to/postgresql.jar JdbcTest

--
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com
import java.sql.*;

public class JdbcTest {
    public static void main(String[] args) throws Exception
    {
        Class.forName("org.postgresql.Driver");
        Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost/testdb", "username", "pw");

        ResultSet rs = conn.prepareStatement("SELECT * FROM test").executeQuery();
        while(rs.next())
            System.out.println(rs.getString(1));
    }
}