Re: [INTERFACES] ecpg - `exec sql delete' failing

At 0:46 +0300 on 4/4/98, Tom Good wrote:

> Hi. Can't fathom why this code precompiles, compiles, links and
> seems to execute - but won't delete records.
> As always - any assistance greatly appreciated!
> Tom
> --- pgc code follows ---
>
> #include <stdio.h>
>
> EXEC SQL BEGIN DECLARE SECTION;
> int ClientID; /* client_id */
> char FirstName[16]; /* client_fname */
> char LastName[16]; /* client_lname */
> char NameTag[16]; /* usr buffer */
> char reply; /* usr buffer */
> int delete_num; /* usr buffer */
> EXEC SQL END DECLARE SECTION;

[snip]

> printf("\t\tRemove this record (y/n): ");
> scanf("%s", &reply);
> if(reply == 'y') {
> printf("\t\tEnter Client ID Number: ");
> scanf("%d", &delete_num);
> EXEC SQL DELETE FROM central WHERE client_id = delete_num;
> }
> else printf("Exiting...record not removed.\n");
> exit(0);
> }

Reminds me of a mistake a friend of mine did in one of his university
exercises. The variable reply is declared as char, but you're scanning to
it as string, so there is a "\0" which enters somewhere (perhaps the
alignment bytes of delete_num, who knows), and causes a garble. Why don't
you try to scan it using "%c", not "%s"?

Herouth

--
Herouth Maoz, B.Sc. Work: herouth(at)oumail(dot)openu(dot)ac(dot)il
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