charFileHash: Character File Hash Function

Description Usage Arguments Details Author(s) See Also Examples

Description

Function to be used to specify the file where key-value pairs get stored for local disk connections, useful when keys are scalar strings. Should be passed as the argument fileHashFn to localDiskConn.

Usage

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charFileHash(keys, conn)

Arguments

keys

keys to be hashed

conn

a "localDiskConn" object

Details

You shouldn't need to call this directly other than to experiment with what the output looks like or to get ideas on how to write your own custom hash.

Author(s)

Ryan Hafen

See Also

localDiskConn, digestFileHash

Examples

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# connect to empty localDisk directory
path <- file.path(tempdir(), "irisSplit")
unlink(path, recursive = TRUE)
conn <- localDiskConn(path, autoYes = TRUE, fileHashFn = charFileHash)
# add some data
addData(conn, list(list("key1", iris[1:10,])))
addData(conn, list(list("key2", iris[11:110,])))
addData(conn, list(list("key3", iris[111:150,])))
# see that files were stored by their key
list.files(path)

datadr documentation built on May 1, 2019, 8:06 p.m.