To use EXEC SQL directives you need to use the PRO*C precompiler before the C compiler. See http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14407/toc.htm Pro*C/C++ Programmer's Guide 10g Release 2 (10.2) Reads the introduction first! If you don't want to use the pre-compiler, you can't use PRO*C directives and embedded SQL - you can use OCI, the Oracle Call Interface, instead - see http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14250/toc.htm. Certainly, PRO*C is easier to get started with (in my opinion). Hope that helps Regards Nigel ----- Original Message ---- From: Shwe Yee Than <shweyeesyt@xxxxxxxxx> To: Prasad <p4cldba@xxxxxxxxx> Cc: oracle-l@xxxxxxxxxxxxx Sent: Friday, January 18, 2008 7:36:58 AM Subject: Re: connect oracle 10g DB from C language As you suggested, I used the following code in my program:EXEC SQL WHENEVER SQLERROR GOTO error_in_SQL; /* ... */error_in_SQL: /* do error handling */ I got this error: alpha1.c:12672: error: `EXEC' undeclared (first use in this function) I also declare the header file: #include <sqlca.h>. what should i do?? any sugession?? Prasad <p4cldba@xxxxxxxxx> wrote: http://infolab.stanford.edu/~ullman/fcdb/oracle/or-proc.html#preprocessor%20directives On Jan 17, 2008 8:55 PM, Shwe Yee Than <shweyeesyt@xxxxxxxxx> wrote: Hi, How can I connect to the oracle 10g database from C program code? I want to use EXEC SQL command in the C program. Can anyone help me? Thanks in advance. Regards, Shwe Looking for last minute shopping deals? Find them fast with Yahoo! Search. Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now.