Spring Data MongoDB - Spring Web Services - Parent - SpringSource

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please define productname in your docbook file!Here is an example that uses the CollectionCallback to return information about an indexboolean hasIndex = template.execute("geolocation", new CollectionCallbackBoolean>() {public Boolean doInCollection(Venue.class, DBCollection collection) throwsMongoException, DataAccessException {List indexes = collection.getIndexInfo();for (DBObject dbo : indexes) {if ("location_2d".equals(dbo.get("name"))) {return true;}}return false;}});5.16 GridFS supportMongoDB supports storing binary files inside it's filesystem GridFS. Spring Data MongoDB providesa GridFsOperations interface as well as the according implementation GridFsTemplate toeasily interact with the filesystem. You can setup a GridFsTemplate instance by handing it aMongoDbFactory as well as a MongoConverter:class GridFsConfiguration extends AbstractMongoConfiguration {// … further configuration omitted}@Beanpublic GridFsTemplate gridFsTemplate() {return new GridFsTemplate(mongoDbFactory(), mappingMongoConverter());}Example 5.27 JavaConfig setup for a GridFsTemplateAn according XML configuration looks like this:Example 5.28 XML configuration for a GridFsTemplateYou can no get the template injected and perform storing and retrieving operations to it.1.4.0.BUILD-SNAPSHOTSpring Data MongoDB -Reference Documentation 67
please define productname in your docbook file!class GridFsClient {@AutowiredGridFsOperations operations;@Testpublic void storeFileToGridFs {FileMetadata metadata = new FileMetadata();// populate metadataResource file = … // lookup File or Resource}}operations.store(file.getInputStream(), "filename.txt", metadata);Example 5.29 Using GridFsTemplate to store filesThe store(…) operations take an InputStream, a filename and optionally metadata informationabout the file to store. The metadata can be an arbitrary object which will be marshalled by theMongoConverter configured with the GridFsTemplate. Alternatively you can also provide aDBObject as well.Reading files from the filesystem can either be achieved through the find(…) or getResources(…)methods. Let's have a look at the find(…) methods first. You can either find a single file matching aQuery or multiple ones. To easily define file queries we provide the GridFsCriteria helper class.It provides static factory methods to encapsulate default metadata fields (e.g. whereFilename(),whereContentType()) or the custom one through whereMetaData().class GridFsClient {@AutowiredGridFsOperations operations;}@Testpublic void findFilesInGridFs {List result = operations.find(query(whereFilename().is("filename.txt")))}Example 5.30 Using GridFsTemplate to query for filesNoteCurrently MongoDB does not support defining sort criterias when retrieving files from GridFS.Thus any sort criterias defined on the Query instance handed into the find(…) method will bedisregarded.The other option to read files from the GridFs is using the methods introduced by theResourcePatternResolver interface. They allow handing an Ant path into the method ar thusretrieve files matching the given pattern.1.4.0.BUILD-SNAPSHOTSpring Data MongoDB -Reference Documentation 68
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