71 lines
2.0 KiB
Ruby
71 lines
2.0 KiB
Ruby
$:.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
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require 'mongo'
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require 'pp'
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include Mongo
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host = ENV['MONGO_RUBY_DRIVER_HOST'] || 'localhost'
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port = ENV['MONGO_RUBY_DRIVER_PORT'] || Connection::DEFAULT_PORT
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puts "Connecting to #{host}:#{port}"
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db = Connection.new(host, port).db('ruby-mongo-examples')
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coll = db.collection('test')
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# Remove all records, if any
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coll.remove
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# Insert three records
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coll.insert('a' => 1)
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coll.insert('a' => 2)
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coll.insert('b' => 3)
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# Count.
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puts "There are #{coll.count()} records."
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# Find all records. find() returns a Cursor.
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cursor = coll.find()
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# Print them. Note that all records have an _id automatically added by the
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# database. See pk.rb for an example of how to use a primary key factory to
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# generate your own values for _id.
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cursor.each { |row| pp row }
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# Cursor has a to_a method that slurps all records into memory.
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rows = coll.find().to_a
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rows.each { |row| pp row }
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# See Collection#find. From now on in this file, we won't be printing the
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# records we find.
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coll.find('a' => 1)
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# Find records sort by 'a', skip 1, limit 2 records.
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# Sort can be single name, array, or hash.
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coll.find({}, {:skip => 1, :limit => 2, :sort => 'a'})
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# Find all records with 'a' > 1. There is also $lt, $gte, and $lte.
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coll.find({'a' => {'$gt' => 1}})
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coll.find({'a' => {'$gt' => 1, '$lte' => 3}})
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# Find all records with 'a' in a set of values.
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coll.find('a' => {'$in' => [1,2]})
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# Find by regexp
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coll.find('a' => /[1|2]/)
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# Print query explanation
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pp coll.find('a' => /[1|2]/).explain()
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# Use a hint with a query. Need an index. Hints can be stored with the
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# collection, in which case they will be used with all queries, or they can be
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# specified per query, in which case that hint overrides the hint associated
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# with the collection if any.
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coll.create_index('a')
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coll.hint = 'a'
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# You will see a different explanation now that the hint is in place
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pp coll.find('a' => /[1|2]/).explain()
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# Override hint for single query
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coll.find({'a' => 1}, :hint => 'b')
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