From: | "Hugo Pablo Leyva" <hpl(at)colima(dot)com> |
---|---|
To: | pgsql-ayuda(at)tlali(dot)iztacala(dot)unam(dot)mx |
Subject: | [Pgsql-ayuda] JDBC si jalar |
Date: | 2003-05-22 02:26:51 |
Message-ID: | 20030522022652.24671.qmail@mexico.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-es-ayuda |
¡ Hola lista !
Estoy probando postgresql con diferentes
API's.
Las de C, C++ me funcionan bien pero tengo
problemas con JDBC
Pruebo con el siguiente programa:
import java.io.*;
import java.sql.*;
public class myappjdbc
{
Connection conn;
Statement stmt;
String state_code;
public myappjdbc() throws
ClassNotFoundException,
FileNotFoundException, IOException,
SQLException
{
Class.forName("org.postgresql.Driver");
conn =
DriverManager.getConnection("jdbc:postgresql:stores7","hpl","");
System.out.println("DEMO JDBC
");
System.out.print("Enter a
state code: ");
System.out.flush();
BufferedReader r = new
BufferedReader(new
InputStreamReader(System.in));
state_code=r.readLine();
ResultSet res =
stmt.executeQuery("SELECT sname FROM state
WHERE code = '" + state_code + "'");
if(res!=null)
while(res.next())
{
String
state_name = res.getString(1);
System.out.println(state_code + "=" +
state_name);
}
res.close();
stmt.close();
conn.close();
}
public static void main(String args[])
{
try
{
myappjdbc test = new
myappjdbc();
}
catch (Exception exc)
{
System.err.println("Exception caught.\n"+exc);
exc.printStackTrace();
}
}
}
Al correr me marca:
$ java myappjdbc
DEMO JDBC
Enter a state code: CA
Exception caught.
java.lang.NullPointerException
java.lang.NullPointerException
at myappjdbc.<init>(myappjdbc.java:20)
at myappjdbc.main(myappjdbc.java:37)
La variable CLASSPATH es
CLASSPATH=/usr/share/pgsql/jdbc7.0-1.1.jar:/usr/share/pgsql/jdbc7.1-1.2.jar:.
USO RH 7.2 y postgresql 7.1.3-2
¿ Donde puede estar el error ?
¡ Grapcias !
--
Powered by Outblaze
From | Date | Subject | |
---|---|---|---|
Next Message | Alvaro Herrera | 2003-05-22 02:55:52 | Re: [Pgsql-ayuda] Configurar postgres antes de compilarlo??? |
Previous Message | Leonardo Boet Sánchez | 2003-05-21 23:28:50 | [Pgsql-ayuda] Configurar postgres antes de compilarlo??? |