A preliminary study on MongoDB Gridfs

Simple Introduction using Gridfs:

List files:

[Email protected] ~]# mongofiles list
Connected to:127.0.0.1

No files exist at this time.

Upload file:

[Email protected] ~]# Mongofiles put install.log-d Libraray
Connected to:127.0.0.1
Added file: {_id:objectid (' 5616b8c4f1403ca60b0999d0 '), FileName: "Install.log", chunksize:261120, Uploaddate:new Date (1444329668441), MD5: "c7d8a01a077940859e773b7770d2e07e", length:9458}
done!

List the uploaded files again:

[Email protected] ~]# mongofiles list-d Libraray
Connected to:127.0.0.1
Install.log 9458

To view data in MongoDB:

[Email protected] ~]# MONGO Libraray
MongoDB Shell version:2.6.11
Connecting To:libraray
> Db.fs.files.find ()
{"_id": ObjectId ("5616b8c4f1403ca60b0999d0"), "filename": "Install.log", "chunkSize": 261120, "uploaddate": Isodate (" 2015-10-08t18:41:08.441z ")," MD5 ":" c7d8a01a077940859e773b7770d2e07e "," Length ": 9458}
>
Specify ID:

> Db.fs.files.find ({"_id": ObjectId ("5616b8c4f1403ca60b0999d0")})
{"_id": ObjectId ("5616b8c4f1403ca60b0999d0"), "filename": "Install.log", "chunkSize": 261120, "uploaddate": Isodate (" 2015-10-08t18:41:08.441z ")," MD5 ":" c7d8a01a077940859e773b7770d2e07e "," Length ": 9458}

> db.fs.chunks.find ({},{"data": 0})
{"_id": ObjectId ("5616b8c4d2b40c73cbf811c8"), "files_id": ObjectId ("5616b8c4f1403ca60b0999d0"), "n": 0}

Search for files:

[email protected] ~]# cat Testfile
Hello ABC

[Email protected] ~]# Mongofiles put testfile-d Libraray
Connected to:127.0.0.1
Added file: {_id:objectid (' 5616bd093be512c2e45d0351 '), FileName: "Testfile", chunksize:261120, Uploaddate:new Date (14 44330761770), MD5: "563427968920fcf5177c6753bd6cbae3", length:10}
done!

[Email protected] ~]# Mongofiles search test-d Libraray
Connected to:127.0.0.1
Testfile 10

(seemingly unable to search the file content!!!) ）

To delete a file:

[Email protected] ~]# mongofiles Delete testfile-d Libraray
Connected to:127.0.0.1
done!
[Email protected] ~]# Mongofiles search test-d Libraray
Connected to:127.0.0.1

Get file:

[[email protected] ~]# ls
Anaconda-ks.cfg Install.log install.log.syslog Modb testfile
[Email protected] ~]# RM-RF Install.log
[[email protected] ~]# mongofiles get install.log-d Libraray
Connected to:127.0.0.1
Done Write To:install.log
[[email protected] ~]# ls
Anaconda-ks.cfg Install.log install.log.syslog Modb testfile

Test upload Large files:

[Email protected] ~]# du-h 2290944.zip
3.2G 2290944.zip

[Email protected] ~]# Mongofiles put 2290944.zip-d Libraray
Connected to:127.0.0.1
Added file: {_id:objectid (' 5616c158bfb7f87bb8e48d44 '), FileName: "2290944.zip", chunksize:261120, Uploaddate:new Date (1444331976703), MD5: "6FC45DD991D89DB358194EBA0B565F30", length:3372909855}
done!

> Db.fs.chunks.find ({"files_id": ObjectId ("5616c158bfb7f87bb8e48d44")},{"data": 0}). sort ({n:-1}). Limit (1)
{"_id": ObjectId ("5616c1a2d2b40c73cbf84467"), "files_id": ObjectId ("5616c158bfb7f87bb8e48d44"), "n": 12917}

There are a total of 12,918 chunk (the first chunk is 0), the 12918x261120 size is: 3373148160 can save this file, in other machines to retrieve it back to success.

This article is from the "Technical Blog" blog, please be sure to keep this source http://raytech.blog.51cto.com/7602157/1701254

A preliminary study on MongoDB Gridfs