Problem in jdbc connect thru oracle

Question

hi all
i hv installed oracle 8i on win2k
i wanna connect thru jdbc
but i am getting error below
i donno whr i got struck?
plz help me
thnx in advance
bye
////////// details ///////////////////////
import java.sql.*;
///win2000,oracle 8i
/// try to fix whr i hv done mistake
import java.io.*;
class JDBC1
public static void main(String[] args)
try
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver ");
//// i tried all below connections
Connection cn=DriverManager.getConnection("jdbc:odbc:santhu:PLSExtProc","scott","tiger"); /// oracle_sid=santhu hv given
//Connection cn= DriverManager.getConnection("jdbc:odbc:PLSExtProc","scott","tiger"); /// PLSExtProc it is given in tnsnames.ora file
//Connection cn=DriverManager.getConnection("jdbc:odbc:oracle:PLSExtProc","scott","tiger"); /// driver name i hv given as oracle and one more as santhu--both for oracle driver
Statement st=cn.createStatement();
ResultSet rs=st.executeQuery("select * from dept");
int dno;
String dname;
while(rs.next())
dno=rs.getInt("deptno");
dname=rs.getString("dname");
System.out.println(dno+dname);
catch(Exception e)
System.out.println(e);
/// compiled successfully
/// but runtime error::SQLException---data source name not found no default driver specified
//// saying tns-12538 error
/// tnsping-----error is coming.........
/// lsnrctl start --------is not working
//// lsnrctl status ------is also not working
/// in services i hv set oraclelistener to auotmatic start
/// in net8 configuration assistent everything is ok
/// try to do it today...ok na
// i put classpath to home dir of oracle
///////////listener.ora file //////////////////////////////
# LISTENER.ORA Network Configuration File: D:\Oracle\Ora81\NETWORK\ADMIN\listener.ora
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = Vaman)(PORT = 1521))
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = vaman)(PORT = 2481))
(PROTOCOL_STACK =
(PRESENTATION = GIOP)
(SESSION = RAW)
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = D:\Oracle\Ora81)
(PROGRAM = extproc)
(SID_DESC =
(GLOBAL_DBNAME = santhu)
(ORACLE_HOME = D:\Oracle\Ora81)
(SID_NAME = santhu)
/////////////////tnsnames.ora file///////////////////
# LISTENER.ORA Network Configuration File: D:\Oracle\Ora81\NETWORK\ADMIN\listener.ora
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = Vaman)(PORT = 1521))
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = vaman)(PORT = 2481))
(PROTOCOL_STACK =
(PRESENTATION = GIOP)
(SESSION = RAW)
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = D:\Oracle\Ora81)
(PROGRAM = extproc)
(SID_DESC =
(GLOBAL_DBNAME = santhu)
(ORACLE_HOME = D:\Oracle\Ora81)
(SID_NAME = santhu)
////////////////////////////////////////////////

Answer 1

Class.forName("oracle.jdbc.OracleDriver");
Connection con = DriverManager.getConnection("jdbc:oracle:thin:@<hostname>:1521:<database name>", "scott", "tiger");
You can find OracleDriver in classes12.jar (<ORA_HOME>/jdbc).
Check your tnsnames.ora file for <hostname> and <database name>. For example, if you had a following entry in tnsnames.ora file:
XE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = SOMEHOST)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XE)
you would write:
Connection con = DriverManager.getConnection("jdbc:oracle:thin:@SOMEHOST:1521:XE", "scott", "tiger");