Description Usage Arguments Value See Also Examples
Get a chunk of a mongo.gridfile.
1 | mongo.gridfile.get.chunk(gridfile, i)
|
gridfile |
A (mongo.gridfile) object. |
i |
(integer) The index of the chunk to fetch. This should be in the
range 0 to |
(mongo.bson) the i
th chunk of gridfile
if
successful; otherwise, NULL.
The value returned is the i
th document in the 'chunks' collection of
the GridFS. The 'data' field of this document contains the actual data
belonging to the chunk.
See
http://www.mongodb.org/display/DOCS/GridFS+Specification.
mongo.gridfs
,
mongo.gridfs.find
,
mongo.gridfile,
mongo.gridfile.get.descriptor
,
mongo.gridfile.get.filename
,
mongo.gridfile.get.length
,
mongo.gridfile.get.chunk.size
,
mongo.gridfile.get.chunk.count
,
mongo.gridfile.get.content.type
,
mongo.gridfile.get.upload.date
,
mongo.gridfile.get.md5
,
mongo.gridfile.get.metadata
,
mongo.gridfile.get.chunks
,
mongo.gridfile.read
,
mongo.gridfile.seek
,
mongo.gridfile.pipe
.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | mongo <- mongo.create()
if (mongo.is.connected(mongo)) {
gridfs <- mongo.gridfs.create(mongo, "grid")
mongo.gridfs.store.file(gridfs, "tests/test.R", "test.R")
gf <- mongo.gridfs.find(gridfs, "test.R")
if( !is.null(gf)){
chunk <- mongo.gridfile.get.chunk(gf, 0)
iter <- mongo.bson.find(chunk, "data")
f <- file("testChunk0.R", "wb")
# write the binary (raw) data to a file
writeBin(mongo.bson.iterator.value(iter), f)
close(f)
mongo.gridfile.destroy(gf)
}
mongo.gridfs.destroy(gridfs)
}
|
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