Newbie help on JDBC, please

Question

Hi,
I am new to Java Programming,and JDBC. I have installed jdbc driver for Postgresql, and is working fine. I have the following code (which I can compile, but when I run I gets many lines of error messages):
import java.io.*;
import java.sql.*;
import java.util.*;
public class ContactInput {
public static void main(String args[]) {
     int serial = 2;
     String name ="Patty Thapa";
     String email ="[email protected]";
     String homepage ="www.damars.net/~pat";
     String tel = "2334 2747";
     String add = "Hong kong";
     String url = "jdbc:postgresql:contacts";
     Connection con;
     PreparedStatement pprStmt;
     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,"damar", "");
          pprStmt=con.prepareStatement("INSERT INTO address(serial, name, email, homepage, telephone, postaladdress)"
          + "values(?,?,?,?,?,?)");
          pprStmt.clearParameters();
          pprStmt.setInt(1,serial);
          pprStmt.setString(2,name);
          pprStmt.setString(3,email);
          pprStmt.setString(4,homepage);
          pprStmt.setString(5,tel);
          pprStmt.setString(6,add);
          pprStmt.executeUpdate();
          pprStmt.close();
          con.close();
          } catch(SQLException ex) {
               System.err.println("SQLException: " + ex.getMessage());
Can any one please points me what I have done wrong here?
Thanks
Damar

Answer 1

Hi,
Further to my previous problem of PreparedStatement, I have the following code:
import java.sql.*;
import java.util.*;
public class AddressDisp{
public static void main(String[] args){
     try{
     Class.forName("org.postgresql.Driver");
     catch (ClassNotFoundException e){
     System.out.println("Unable to load Driver Class");
     return;
     try{
     Connection con = DriverManager.getConnection("jdbc:postgresql:contacts","damar","");
     Statement stmt=con.createStatement();
     ResultSet rs = stmt.executeQuery("Select name from address");
     while(rs.next()){
          System.out.print(rs.getString("name"));
          System.out.print(rs.getInt("ser"));
          System.out.print(", " +rs.getString("email"));
          System.out.print(", " + rs.getString("telephone"));
          System.out.println(", " + rs.getString("postaladdress"));
     rs.close();
     stmt.close();
     con.close();
     catch(SQLException se){
     System.out.println("SQL Exception : " + se.getMessage());
     se.printStackTrace(System.out);
In address table, there is 6 fields namely, ser (int), name (char(20)), email (varchar(24)), homepage (varchar(25)), telephone (char(15)), postaladdress (varchar(30)). The above code works properly only with "System.out.print(rs.getString("name"))" ie I can get all names, but all other fields end up with following message:
SQL Exception : The column name ser not found.
The column name ser not found.
at 0x4017224b: java.lang.Throwable.Throwable(java.lang.String) (/usr/lib/libgcj.so.2)
at 0x4016885b: java.lang.Exception.Exception(java.lang.String) (/usr/lib/libgcj.so.2)
at 0x401e0a40: java.sql.SQLException.SQLException(java.lang.String, java.lang.String, int) (/usr/lib/libgcj.so.2)
at 0x401e09cb: java.sql.SQLException.SQLException() (/usr/lib/libgcj.so.2)
at 0x4023925f: ffi_call_SYSV (/usr/lib/libgcj.so.2)
at 0x40239227: ffi_raw_call (/usr/lib/libgcj.so.2)
at 0x4014c8db: JvInterpMethod.continue1(_Jv_InterpMethodInvocation) (/usr/lib/libgcj.so.2)
at 0x40150703: JvInterpMethod.run(ffi_cif, void, ffi_raw, JvInterpMethodInvocation) (/usr/lib/libgcj.so.2)
at 0x4014c671: JvInterpMethod.run_normal(ffi_cif, void, ffi_raw, void) (/usr/lib/libgcj.so.2)
at 0x40239114: ?? (??:0)
at 0x4023925f: ffi_call_SYSV (/usr/lib/libgcj.so.2)
at 0x40239227: ffi_raw_call (/usr/lib/libgcj.so.2)
at 0x4014c8db: JvInterpMethod.continue1(_Jv_InterpMethodInvocation) (/usr/lib/libgcj.so.2)
at 0x40150703: JvInterpMethod.run(ffi_cif, void, ffi_raw, JvInterpMethodInvocation) (/usr/lib/libgcj.so.2)
at 0x4014c671: JvInterpMethod.run_normal(ffi_cif, void, ffi_raw, void) (/usr/lib/libgcj.so.2)
at 0x40239114: ?? (??:0)
at 0x4023925f: ffi_call_SYSV (/usr/lib/libgcj.so.2)
at 0x40239227: ffi_raw_call (/usr/lib/libgcj.so.2)
at 0x4014c8db: JvInterpMethod.continue1(_Jv_InterpMethodInvocation) (/usr/lib/libgcj.so.2)
at 0x40150703: JvInterpMethod.run(ffi_cif, void, ffi_raw, JvInterpMethodInvocation) (/usr/lib/libgcj.so.2)
at 0x4014c671: JvInterpMethod.run_normal(ffi_cif, void, ffi_raw, void) (/usr/lib/libgcj.so.2)
at 0x40239114: ?? (??:0)
at 0x4023925f: ffi_call_SYSV (/usr/lib/libgcj.so.2)
at 0x40239227: ffi_raw_call (/usr/lib/libgcj.so.2)
at 0x4014c8db: JvInterpMethod.continue1(_Jv_InterpMethodInvocation) (/usr/lib/libgcj.so.2)
at 0x40150703: JvInterpMethod.run(ffi_cif, void, ffi_raw, JvInterpMethodInvocation) (/usr/lib/libgcj.so.2)
at 0x4014c671: JvInterpMethod.run_normal(ffi_cif, void, ffi_raw, void) (/usr/lib/libgcj.so.2)
at 0x40239114: ?? (??:0)
at 0x4015365f: gnu.gcj.runtime.FirstThread.run() (/usr/lib/libgcj.so.2)
at 0x4015db63: java.lang.Thread.run_(java.lang.Object) (/usr/lib/libgcj.so.2)
at 0x402386a4: ?? (??:0)
at 0x403def76: GC_start_routine (/usr/lib/libgcjgc.so.1)
at 0x403f70ba: ?? (??:0)
at 0x4050bd4a: __clone (/lib/libc.so.6)
In "System.out.print(rs.getString("name"))", why only name field works, but others end up with column name not found error message? Is not name, or other fields are, the field/s in the database table? Is my system working?
Any pointers would be highly appreciated.
Damar