Description Usage Arguments Details See Also Examples
Write raw data to a buffered GridFS file. The data is buffered and sent to the server in 256k chunks as it accumulates.
1 |
gfw |
A (mongo.gridfile.writer) object. |
raw |
(raw) The data to write to the GridFS file. |
This function only handles the RAW type. Use writeBin()
as necessary
to pack your data appropriately for storage. See the examples and R's
documentation on writeBin()
.
Use mongo.gridfs.store()
when you only need to write one data
packet as a complete GridFS file.
mongo.gridfs,
mongo.gridfile.writer.create
,
mongo.gridfile.writer,
mongo.gridfile.writer.finish
.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | mongo <- mongo.create()
if (mongo.is.connected(mongo)) {
gridfs <- mongo.gridfs.create(mongo, "grid")
gfw <- mongo.gridfile.writer.create(gridfs, "test.dat")
# store 4 bytes
mongo.gridfile.writer.write(gfw, charToRaw("test"))
# store string & LF plus 0-byte terminator
buf <- writeBin("Test\n", as.raw(1))
mongo.gridfile.writer.write(gfw, buf)
# store PI as a float
buf <- writeBin(3.1415926, as.raw(1), size=4, endian="little")
mongo.gridfile.writer.write(gfw, buf)
mongo.gridfile.writer.finish(gfw)
mongo.gridfs.destroy(gridfs)
}
|
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