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# This project is primarily a set of example Java programs # that demonstrate working with MongoDB's GridFS & the metadata field # sample images are from: http://www.mongodb.org/downloads # Compile the sample programs javac GridFsRead.java -classpath .:./mongo-java-driver-2.10.1.jar javac GridFsStore.java -classpath .:./mongo-java-driver-2.10.1.jar javac GridFsStoreChunk.java -classpath .:./mongo-java-driver-2.10.1.jar # make sure mongod is running # Insert the images into GridFS java -classpath .:./mongo-java-driver-2.10.1.jar GridFsStore PoweredMongoDBbeige50.png beige java -classpath .:./mongo-java-driver-2.10.1.jar GridFsStore PoweredMongoDBblue50.png blue java -classpath .:./mongo-java-driver-2.10.1.jar GridFsStore PoweredMongoDBbrown50.png brown java -classpath .:./mongo-java-driver-2.10.1.jar GridFsStore PoweredMongoDBgreen50.png green java -classpath .:./mongo-java-driver-2.10.1.jar GridFsStoreChunk PoweredMongoDBbeige50.png chunkbeige java -classpath .:./mongo-java-driver-2.10.1.jar GridFsStoreChunk PoweredMongoDBblue50.png chunkblue java -classpath .:./mongo-java-driver-2.10.1.jar GridFsStoreChunk PoweredMongoDBbrown50.png chunkbrown java -classpath .:./mongo-java-driver-2.10.1.jar GridFsStoreChunk PoweredMongoDBgreen50.png chunkgreen # set an index on the metadata # open a mongo shell, then: use imagedb db.images.files.find().count() // should be 8 db.images.chunks.find().count() // should be 12 db.images.files.findOne() // notice the meta db.images.files.ensureIndex({"metadata.color":1}) db.images.files.getIndexes() // you should see the new index # query with explain on index db.images.files.find({"metadata.color":"blue"}).explain() # the output should include this line: "cursor" : "BtreeCursor metadata.color_1", # read file out, save as color.png java -classpath .:./mongo-java-driver-2.10.1.jar GridFsRead green # you should now have a green.png in the current directory
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