The DB->get() method retrieves 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 that it
is possible to search it by logical record number, retrieve a specific
record.
 
      If the database has been configured to support duplicate records,
DB->get() will always return the first data item in the duplicate
set.