filehashDB1-class: Filehash DB1 Class

Description

An implementation of filehash databases using a single large file

Usage

# S4 method for filehashDB1,character
dbInsert(db, key, value, ...)
# S4 method for filehashDB1,character
dbFetch(db, key, ...)
# S4 method for filehashDB1,character
dbMultiFetch(db, key, ...)
# S4 method for filehashDB1,character
dbExists(db, key, ...)
# S4 method for filehashDB1
dbList(db, ...)
# S4 method for filehashDB1,character
dbDelete(db, key, ...)
# S4 method for filehashDB1
dbUnlink(db, ...)
# S4 method for filehashDB1
dbReorganize(db, ...)

Arguments

db: a filehashDB1 object
key: character, the name of an R object in the database
value: an R object
...: arguments passed to other methods

Methods (by generic)

dbInsert(db = filehashDB1, key = character): Insert an R object into a filehashDB1 database
dbFetch(db = filehashDB1, key = character): Retrieve an object from a filehash DB1 database
dbMultiFetch(db = filehashDB1, key = character): Retrieve multiple objects from a filehash DB1 database
dbExists(db = filehashDB1, key = character): Determine if a key exists in a filehash DB1 database
dbList(filehashDB1): Return a character vector containing all keys in a database
dbDelete(db = filehashDB1, key = character): Delete a key and it's corresponding object from a filehashDB1 database
dbUnlink(filehashDB1): Delete an entire filehashDB1 database
dbReorganize(filehashDB1): Reorganize and compactify a filehahsDB1 database

Slots

datafile: full path to the database file (filehashDB1 only)

meta

list containing an environment for database metadata (filehashDB1 only)

Details

For dbMultiFetch, key is a character vector of keys.