Queue problem: upgrade with DP_APPEND or get with DB_CONSUME

Hello

I coded just a few small C programs that use queues of Berkeley DB. Well, it works, but only if I do not use DB_APPEND, or DB_CONSUME. If I use these 2 keywords (flags), I get an error "Invalid Argument".

Why?

I noticed that when I go to the queue with a cursor, records are not deleted.
How to "consume" records, aka deleting records after reading?

Thank you

The DB_APPEND and DB_CONSUME operations return the record number in the key of the DBT. For this reason, the DBT key must be configured to have a return value.

When you use the indicator DB_THREAD with Berkeley DB, you are required to define an indicator of memory management in the DBT so that Berkeley DB knows whether to allocate memory or copy the key into a buffer managed by the application. Please see this page for more information:

http://www.Oracle.com/technology/documentation/Berkeley-DB/DB/api_c/dbt_class.html

In summary, if you don't care the registration number, set the key like this:

Memset (& key, 0, sizeof (key));
Key.Flags = DB_DBT_USERMEM | DB_DBT_PARTIAL;

In this way, Berkeley DB will not attempt to return the record number in the key of the DBT.

The same question applies to the DBT data, but then, you probably care about data, so you must set DB_DBT_MALLOC to have Berkeley DB to allocate memory (which should release the application), or DB_DBT_USERMEM if you have a preallouee buffer.

Kind regards
Michael Cahill, Oracle Berkeley DB.

Tags: Database

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