filehashRDS-class {filehash} | R Documentation |
Filehash RDS Class
Description
An implementation of filehash databases using diretories and separate files
Usage
## S4 method for signature 'filehashRDS,character'
dbInsert(db, key, value, safe = TRUE, ...)
## S4 method for signature 'filehashRDS,character'
dbFetch(db, key, ...)
## S4 method for signature 'filehashRDS,character'
dbMultiFetch(db, key, ...)
## S4 method for signature 'filehashRDS,character'
dbExists(db, key, ...)
## S4 method for signature 'filehashRDS'
dbList(db, ...)
## S4 method for signature 'filehashRDS,character'
dbDelete(db, key, ...)
## S4 method for signature 'filehashRDS'
dbUnlink(db, ...)
Arguments
db |
a filehashRDS object |
key |
character, the name of an R object |
value |
an R object |
safe |
Should the operation be done safely? |
... |
arguments passed to other methods |
Details
When safe = TRUE
in dbInsert
, objects are written to a temp file before replacing any existing objects. This way, if the operation is interrupted, the original data are not corrupted.
For dbMultiFetch
, key
is a character vector of keys.
Methods (by generic)
-
dbInsert(db = filehashRDS, key = character)
: Insert an R object into a filehashRDS database -
dbFetch(db = filehashRDS, key = character)
: Retrieve a value from a filehashRDS database -
dbMultiFetch(db = filehashRDS, key = character)
: Retrieve multiple objects from a filehashRDS database -
dbExists(db = filehashRDS, key = character)
: Determine if a key exists in a filehashRDS database -
dbList(filehashRDS)
: Return a character vector of all key stored in a database -
dbDelete(db = filehashRDS, key = character)
: Delete a key and its corresponding object from a filehashRDS database -
dbUnlink(filehashRDS)
: Delete an entire filehashRDS database
Slots
dir
Directory where files are stored (filehashRDS only)