Berkeley DB Reference Guide: Access Methods
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Berkeley DB Reference Guide: Access Methods

Storing records

The DB->put function is the standard function for storing records into the database. In general, the put function takes a key and stores the associated data into the database.

There are a few flags that you can set to customize storage:

Simply append the data to the end of the database, treating the database much like a simple log. This flag is only valid for the Recno access method.

Only store the data item if the key does not already appear in the database.

If the database has been configured to support duplicate records, the DB->put function will add the new data value at the end of the duplicate set. If the database supports sorted duplicates, the new data value is inserted at the correct sorted location.