The types are:[$X =] tie %hash, "DB_File", $filename [, $flags, $mode, $DB_HASH]; [$X =] tie %hash, "DB_File", $filename, $flags, $mode, $DB_BTREE; [$X =] tie @array, "DB_File", $filename, $flags, $mode, $DB_RECNO;
Stores key/data pairs in data files; equivalent to other hashing packages like DBM, NDBM, ODBM, GDBM, and SDBM.
Stores key/data pairs in a binary tree.
Uses a record (line) number to access
fixed-length and variable-length flat text files through
the same key/value-pair interface as in
tied a hash to a database:
you can access the Berkeley DB API functions:$db = tie %hash, "DB_File", "filename";
All the functions defined in the dbopen(3) manpage are available except$db->put($key, $value, R_NOOVERWRITE); # invoke the DB "put" function
dbopenitself. The constants defined in the dbopen manpage are also available.
Here are the functions available (the comments note only the differences from the equivalent C function):