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<div class="section" id="storing-files-with-mongogridfs">
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<h1>Storing Files with MongoGridFS<a class="headerlink" href="#storing-files-with-mongogridfs" title="Permalink to this headline">¶</a></h1>
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<p>The PHP Mongo extension provides a nice and convenient way to store
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files in chunks of data with the
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<a class="reference external" href="http://us.php.net/manual/en/class.mongogridfs.php">MongoGridFS</a>.</p>
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<p>It uses two database collections, one to store the metadata for the
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file, and another to store the contents of the file. The contents
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are stored in chunks to avoid going over the maximum allowed size
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of a MongoDB document.</p>
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<p>You can easily setup a Document that is stored using the
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MongoGridFS:</p>
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<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
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<span class="k">namespace</span> <span class="nx">Documents</span><span class="p">;</span>
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<span class="sd">/** @Document */</span>
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<span class="k">class</span> <span class="nc">Image</span>
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<span class="p">{</span>
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<span class="sd">/** @Id */</span>
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<span class="k">private</span> <span class="nv">$id</span><span class="p">;</span>
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<span class="sd">/** @Field */</span>
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<span class="k">private</span> <span class="nv">$name</span><span class="p">;</span>
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<span class="sd">/** @File */</span>
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<span class="k">private</span> <span class="nv">$file</span><span class="p">;</span>
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<span class="sd">/** @Field */</span>
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<span class="k">private</span> <span class="nv">$uploadDate</span><span class="p">;</span>
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<span class="sd">/** @Field */</span>
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<span class="k">private</span> <span class="nv">$length</span><span class="p">;</span>
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<span class="sd">/** @Field */</span>
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<span class="k">private</span> <span class="nv">$chunkSize</span><span class="p">;</span>
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<span class="sd">/** @Field */</span>
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<span class="k">private</span> <span class="nv">$md5</span><span class="p">;</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">getId</span><span class="p">()</span>
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<span class="p">{</span>
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<span class="k">return</span> <span class="nv">$this</span><span class="o">-></span><span class="na">id</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">setName</span><span class="p">(</span><span class="nv">$name</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="nv">$this</span><span class="o">-></span><span class="na">name</span> <span class="o">=</span> <span class="nv">$name</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">getName</span><span class="p">()</span>
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<span class="p">{</span>
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<span class="k">return</span> <span class="nv">$this</span><span class="o">-></span><span class="na">name</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">getFile</span><span class="p">()</span>
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<span class="p">{</span>
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<span class="k">return</span> <span class="nv">$this</span><span class="o">-></span><span class="na">file</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">setFile</span><span class="p">(</span><span class="nv">$file</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="nv">$this</span><span class="o">-></span><span class="na">file</span> <span class="o">=</span> <span class="nv">$file</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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<p>Notice how we annotated the $file property with @File. This is what
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tells the Document that it is to be stored using the MongoGridFS
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and the MongoGridFSFile instance is placed in the $file property
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for you to access the actual file itself.</p>
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<p>The $uploadDate, $chunkSize and $md5 properties are automatically filled in
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for each file stored in GridFS (whether you like that or not).
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Feel free to create getters in your document to actually make use of them,
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but keep in mind that their values will be initially unset for new objects
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until the next time the document is hydrated (fetched from the database).</p>
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<p>First you need to create a new Image:</p>
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<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
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<span class="nv">$image</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Image</span><span class="p">();</span>
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<span class="nv">$image</span><span class="o">-></span><span class="na">setName</span><span class="p">(</span><span class="s1">'Test image'</span><span class="p">);</span>
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<span class="nv">$image</span><span class="o">-></span><span class="na">setFile</span><span class="p">(</span><span class="s1">'/path/to/image.png'</span><span class="p">);</span>
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<span class="nv">$dm</span><span class="o">-></span><span class="na">persist</span><span class="p">(</span><span class="nv">$image</span><span class="p">);</span>
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<span class="nv">$dm</span><span class="o">-></span><span class="na">flush</span><span class="p">();</span>
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</pre></div>
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</div>
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<p>Now you can later query for the Image and render it:</p>
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<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
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<span class="nv">$image</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">createQueryBuilder</span><span class="p">(</span><span class="s1">'Documents\Image'</span><span class="p">)</span>
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<span class="o">-></span><span class="na">field</span><span class="p">(</span><span class="s1">'name'</span><span class="p">)</span><span class="o">-></span><span class="na">equals</span><span class="p">(</span><span class="s1">'Test image'</span><span class="p">)</span>
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<span class="o">-></span><span class="na">getQuery</span><span class="p">()</span>
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<span class="o">-></span><span class="na">getSingleResult</span><span class="p">();</span>
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<span class="nb">header</span><span class="p">(</span><span class="s1">'Content-type: image/png;'</span><span class="p">);</span>
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<span class="k">echo</span> <span class="nv">$image</span><span class="o">-></span><span class="na">getFile</span><span class="p">()</span><span class="o">-></span><span class="na">getBytes</span><span class="p">();</span>
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</pre></div>
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</div>
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<p>You can of course make references to this Image document from
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another document. Imagine you had a Profile document and you wanted
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every Profile to have a profile image:</p>
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<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
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<span class="k">namespace</span> <span class="nx">Documents</span><span class="p">;</span>
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<span class="sd">/** @Document */</span>
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<span class="k">class</span> <span class="nc">Profile</span>
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<span class="p">{</span>
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<span class="sd">/** @Id */</span>
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<span class="k">private</span> <span class="nv">$id</span><span class="p">;</span>
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<span class="sd">/** @Field */</span>
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<span class="k">private</span> <span class="nv">$name</span><span class="p">;</span>
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<span class="sd">/** @ReferenceOne(targetDocument="Documents\Image") */</span>
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<span class="k">private</span> <span class="nv">$image</span><span class="p">;</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">getId</span><span class="p">()</span>
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<span class="p">{</span>
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<span class="k">return</span> <span class="nv">$this</span><span class="o">-></span><span class="na">id</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">getName</span><span class="p">()</span>
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<span class="p">{</span>
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<span class="k">return</span> <span class="nv">$this</span><span class="o">-></span><span class="na">name</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">setName</span><span class="p">(</span><span class="nv">$name</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="nv">$this</span><span class="o">-></span><span class="na">name</span> <span class="o">=</span> <span class="nv">$name</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">getImage</span><span class="p">()</span>
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<span class="p">{</span>
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<span class="k">return</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">setImage</span><span class="p">(</span><span class="nx">Image</span> <span class="nv">$image</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="nv">$this</span><span class="o">-></span><span class="na">image</span> <span class="o">=</span> <span class="nv">$image</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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<p>Now you can create a new Profile and give it an Image:</p>
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<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
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<span class="nv">$image</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Image</span><span class="p">();</span>
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<span class="nv">$image</span><span class="o">-></span><span class="na">setName</span><span class="p">(</span><span class="s1">'Test image'</span><span class="p">);</span>
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<span class="nv">$image</span><span class="o">-></span><span class="na">setFile</span><span class="p">(</span><span class="s1">'/path/to/image.png'</span><span class="p">);</span>
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<span class="nv">$profile</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Profile</span><span class="p">();</span>
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<span class="nv">$profile</span><span class="o">-></span><span class="na">setName</span><span class="p">(</span><span class="s1">'Jonathan H. Wage'</span><span class="p">);</span>
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<span class="nv">$profile</span><span class="o">-></span><span class="na">setImage</span><span class="p">(</span><span class="nv">$image</span><span class="p">);</span>
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<span class="nv">$dm</span><span class="o">-></span><span class="na">persist</span><span class="p">(</span><span class="nv">$profile</span><span class="p">);</span>
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<span class="nv">$dm</span><span class="o">-></span><span class="na">flush</span><span class="p">();</span>
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</pre></div>
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</div>
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<p>If you want to query for the Profile and load the Image reference
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in a query you can use:</p>
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<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
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<span class="nv">$profile</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">createQueryBuilder</span><span class="p">(</span><span class="s1">'Profile'</span><span class="p">)</span>
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<span class="o">-></span><span class="na">field</span><span class="p">(</span><span class="s1">'name'</span><span class="p">)</span><span class="o">-></span><span class="na">equals</span><span class="p">(</span><span class="s1">'Jonathan H. Wage'</span><span class="p">)</span>
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<span class="o">-></span><span class="na">getQuery</span><span class="p">()</span>
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<span class="o">-></span><span class="na">getSingleResult</span><span class="p">();</span>
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<span class="nv">$image</span> <span class="o">=</span> <span class="nv">$profile</span><span class="o">-></span><span class="na">getImage</span><span class="p">();</span>
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<span class="nb">header</span><span class="p">(</span><span class="s1">'Content-type: image/png;'</span><span class="p">);</span>
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<span class="k">echo</span> <span class="nv">$image</span><span class="o">-></span><span class="na">getFile</span><span class="p">()</span><span class="o">-></span><span class="na">getBytes</span><span class="p">();</span>
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