Do i need a web server for using JDBC?

Question

I read every article about jdbc but i cannot get it working. It looks like everything is good with the program. So the problem is in required components.
Do i need a web server to get it woking? Or it is enough to have Eclipse, jdbc driver in classpath?
Tell me about how that url is working.
For example i have url with localhost. Who is handling that adress? Database? Can you explain what component answers for access to my database through this url parameter. THnx in advance)

Answer 1

I am using PostgreSQL
import java.sql.*;
public class JDBCTest {
      * @param args
     public static void main(String[] args) {
          // TODO Auto-generated method stub
           String url = "jdbc:posgresql://localhost:5432/postgres";
               Connection con;
               Statement stmt;
               try {
                    Class.forName("org.postgresql.Driver");
               } catch(java.lang.ClassNotFoundException e) {
                    System.err.print("ClassNotFoundException: ");
                    System.err.println(e.getMessage());
               try {
                    con = DriverManager.getConnection(url,
                                                  "postgres", "1111");
                    stmt = con.createStatement();
                    con.setAutoCommit(false);
                    /*String insertStore1 = "INSERT INTO test1 VALUES (" +
                      "newval,1);";
                    stmt.addBatch(insertStore1)
                    int [] updateCounts = stmt.executeBatch(); */
                 ResultSet rs = stmt.executeQuery("SELECT * FROM test1");
                    System.out.println("Table test1:");
                    while (rs.next()) {
                         int storeNo = rs.getInt("second_column");
                         String first_column = rs.getString("first_column");          
                         System.out.println(storeNo);
                         System.out.println(first_column);
                    rs.close();
                    stmt.close();
                    con.close();
               } catch(BatchUpdateException b) {
                    System.err.println("-----BatchUpdateException-----");
                    System.err.println("SQLState:  " + b.getSQLState());
                    System.err.println("Message:  " + b.getMessage());
                    System.err.println("Vendor:  " + b.getErrorCode());
                    System.err.print("Update counts:  ");
                    int [] updateCounts = b.getUpdateCounts();
                    for (int i = 0; i < updateCounts.length; i++) {
                         System.err.print(updateCounts[i] + "   ");
                    System.err.println("");
               } catch(SQLException ex) {
                    System.err.println("SQLException: " + ex.getMessage());
                    System.err.println("SQLState:  " + ex.getSQLState());
                    System.err.println("Message:  " + ex.getMessage());
                    System.err.println("Vendor:  " + ex.getErrorCode());
}1 ) Also i have installed PostgreSQL 8.2 , and its running in my services as "PostgreSQL Database Server (postmaster)"
2) I included postgresql-8.2-505.jdbc3.jar into classpasth from eclipse (added it as external library)
3) I have added tcpip_socket = 1 to postgresql.conf
4) I have
# IPv4 local connections:
host all all 127.0.0.1/32 trust
host all all localhost/32 trust
# IPv6 local connections:
#host all all ::1/128 md5
in my pg_hba.conf
==========================
Finally
And i get error: no suitable sql driver
but i don't get System.err.print("ClassNotFoundException: "); as you can see in my code means my classpath is correct...