June 2001
Intermediate to advanced
688 pages
19h 18m
English
Content preview from Berkeley DB
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Retrieving Records
The DB→get function is the standard interface for retrieving records from the database. In general, DB→get takes a key and returns the associated data from the database.
There are a few flags that you can set to customize retrieval:
DB_GET_BOTH Search for a matching key and data item; that is, only return success if both the key and the data items match those stored in the database.
DB_RMW Read-modify-write: Acquire write locks instead of read locks during retrieval. This can enhance performance in threaded applications by reducing the chance of deadlock.
DB_SET_RECNO If the underlying database is a Btree and was configured so it is possible to search it by logical record number, retrieve a specific record.
If the database ...