Re: Connecting to external database using ABAP

i Actually copied program code from the link you sent. but it still not working. Is there any other way we can test if the database connection is working with the parameters provided in DBCO? I am in the same network as of the oracle database so i do not think its the firewall problem.
I get sy-subrc = 4 after line "CONNECT TO :dbs" below

Here is the code ... PARAMETERS dbs TYPE dbcon-con_name.
DATA carrid_wa TYPE scarr-carrid.
DATA dbtype TYPE dbcon_dbms.
SELECT SINGLE dbms
   FROM dbcon
   INTO dbtype
   WHERE con_name = dbs.

IF dbtype = 'ORA'.
  TRY.
   EXECSQL.
  CONNECT TO :dbs
   ENDEXEC.
   IF sy-subrc <> 0.
   RAISE EXCEPTION TYPE cx_sy_native_sql_error.
   ENDIF.
   EXECSQL.
   OPEN dbcur FOR
   SELECT carrid
   FROM scarr
   ENDEXEC.   DO.
   EXECSQL.
   FETCHNEXT dbcur INTO :carrid_wa
   ENDEXEC.
   IF sy-subrc <> 0.
   EXIT.
   ELSE.
   WRITE / carrid_wa.
   ENDIF.
   ENDDO.
   EXECSQL.
   CLOSE dbcur
   ENDEXEC.
   EXECSQL.
  DISCONNECT :dbs
   ENDEXEC.
   CATCH cx_sy_native_sql_error.
   MESSAGE`Error in Native SQL.`TYPE'I'.
  ENDTRY.
ENDIF.