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