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Dokumen ini menggunakan Manual laman web PHP Cina Lepaskan
(PECL mongo >=0.9.0)
MongoGridFS::storeFile — Stores a file in the database
$filename
[, array $metadata
= array()
[, array $options
= array()
]] )
filename
Name of the file or a readable stream to store.
metadata
Other metadata fields to include in the file document.
Note:
These fields may also overwrite those that would be created automatically by the driver, as described in the MongoDB core documentation for the » files collection. Some practical use cases for this behavior would be to specify a custom chunkSize or _id for the file.
options
An array of options for the insert operations executed against the chunks and files collections. See MongoCollection::insert() for documentation on these these options.
Returns the _id of the saved file document. This will be a generated MongoId unless an _id was explicitly specified in the extra
parameter.
Throws MongoGridFSException if there is an error
reading filename
or inserting into the
chunks or files collections.
Example #1 MongoGridFS::storeFile() with additional metadata
<?php
$m = new MongoClient ();
$gridfs = $m -> selectDB ( 'test' )-> getGridFS ();
$id = $gridfs -> storeFile ( 'example.txt' , array( 'contentType' => 'plain/text' ));
$gridfsFile = $gridfs -> get ( $id );
var_dump ( $gridfsFile -> file );
?>
以上例程的输出类似于:
array(7) { ["_id"]=> object(MongoId)#6 (0) { } ["contentType"]=> string(10) "plain/text" ["filename"]=> string(11) "example.txt" ["uploadDate"]=> object(MongoDate)#7 (0) { } ["length"]=> int(26) ["chunkSize"]=> int(262144) ["md5"]=> string(32) "c3fcd3d76192e4007dfb496cca67e13b" }
[#1] mike at eastghost dot com [2012-02-16 13:50:27]
Pass
$options['safe'] = true;
to make Mongo slow down and do inserts sequentially instead of in parallel.
Use case:
I had 274 PDF documents stored on ext3 disk (avg. size was 5MB, none over 20MB)
A PHP loop loaded each PDF, then did a $GridFS->storeFile( $data, $meta );
This caused server to spike from load average of 0.2 to over 20.0
Apparently what was happening is the loop slammed Mongo (then memory, disk) with 274 convert/stores to do all at once.
Adding
$GridFS->storeFile( $data, $meta, array( 'safe' => true ) );
made the loop slow down and wait for each insert to finish and be confirmed before going on to next PDF.
Moral: Safe option can be used to maintain sanity and is not always just for data validity.