Dear All, Current version of Postgres driver for apr_dbd returns ExecStatusType values from query-like functions. This behaviour leads to two unconvenient consequences: - error codes are Postgres-specific - there are no possibility to distinguish between real unrecoverable error (like connection abort) and data error (like constraint violation).
Second item seems more serious to me. Of course, we can get error string, but it is localisation-dependent, and it is not convenient to analyse human-readable text instead of erro code from fixed set. Unfortunately, request results are unaccessible after return from query functions if there were errors. So, it is impossible to obtain SQLSTATE error code in current implementation. My suggestion is to use SQLSTATE codes as return values. There are two difficulties: (i) SQLSATE code is 5-char line, but return type is 4-bytes integer, and (ii) query functions from Postgres client library do not return result object in some situations, and no SQLSTATE code available in this case. The method to overcome the size difficulty can be found in standard Postgres server utilities. Include file <server/utils/elog.h> contains MAKE_SQLSTATE macro which convert 5-bytes code to 4-bytes integer value. Second difficulty shall be solved by convention: some existing code should be used in this situation. For instance, 'connection error' can be used. I've implemented and tested this scheme using version of apr_dbd_pgsql.c from httpd-2.2.2. But current CVS version contains a lot of changes, and I did not use it. Nevertheless, this error reporting scheme seems to me much more convenient than current one. And new Oracle driver may also use it. -- Evgeny Shirykalov <[EMAIL PROTECTED]> --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: [EMAIL PROTECTED] " from the digest: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
