Writing Information to a Database

As well as finding records from a database, you can also add new records to a database, and change or delete existing ones.

• The functions rec_post(), rec_post_with_flags() or dp4_rec_post() are used to insert or update records.
• The function rec_kill() or dp4_rec_kill() is used to delete records.
• The function db_update() or dp4_db_update() is used to commit pending updates. db_commit() and db_checkpoint() are a short-hand form of the most common calls to db_update()
• The function db_decommit() is used to throw away (rollback) pending updates.

This topic is divided into the following sub-topics:

• Creating Transactions

• Posting and Updating Records

• Reading Updates

• Committing, Flushing and Checkpointing