Class: ActiveRecord::ConnectionAdapters::CassandraAdapter

Inherits:
AbstractAdapter
  • Object
show all
Defined in:
lib/active_record/connection_adapters/cassandra_adapter.rb

Instance Method Summary collapse

Constructor Details

#initialize(client, logger, config) ⇒ CassandraAdapter

Returns a new instance of CassandraAdapter.



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# File 'lib/active_record/connection_adapters/cassandra_adapter.rb', line 28

def initialize(client, logger, config)
  super(client, logger)
  @config = config
end

Instance Method Details

#add_limit_offset!(sql, options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/cassandra_adapter.rb', line 172

def add_limit_offset!(sql, options)
  if (limit = options[:limit])
    if limit.kind_of?(Numeric)
      sql << " LIMIT #{limit.to_i}"
    else
      sql << " LIMIT #{quote(limit)}"
    end
  end

  if (offset = options[:offset])
    if offset.kind_of?(Numeric)
      sql << " OFFSET #{offset.to_i}"
    else
      sql << " OFFSET #{quote(offset)}"
    end
  end
end

#delete_sql(sql, name = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/cassandra_adapter.rb', line 136

def delete_sql(sql, name = nil)
  log(sql, name)

  parsed_sql = ActiveCassandra::SQLParser.new(sql).parse
  cf = parsed_sql[:table].to_sym
  cond = parsed_sql[:condition]

  n = 0

  if is_id?(cond)
    [cond].flatten.each do |key|
      @connection.remove(cf, key)
      n += 1
    end
  else
    rows = @connection.get_range(cf).select {|i| i.columns.length > 0 }

    unless cond.empty?
      rows = rows.map {|i| key_slice_to_hash(i) }
      rows = filter(cond).call(rows)

      rows.each do |row|
        @connection.remove(cf, row['id'])
        n += 1
      end
    else
      rows.each do |key_slice|
        @connection.remove(cf, key_slice.key)
        n += 1
      end
    end
  end

  return n
end

#insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/cassandra_adapter.rb', line 75

def insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
  log(sql, name)

  parsed_sql = ActiveCassandra::SQLParser.new(sql).parse
  table = parsed_sql[:table]
  cf = table.to_sym
  column_list = parsed_sql[:column_list]
  value_list = parsed_sql[:value_list]

  class_name = ActiveRecord::Base.class_name(table)
  rowid = Module.const_get(class_name).__identify.to_s

  nvs = {}
  column_list.zip(value_list).each {|n, v| nvs[n] = v.to_s }

  @connection.insert(cf, rowid, nvs)

  return rowid
end

#select(sql, name = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/cassandra_adapter.rb', line 37

def select(sql, name = nil)
  log(sql, name)

  parsed_sql = ActiveCassandra::SQLParser.new(sql).parse

  cf = parsed_sql[:table].to_sym
  cond = parsed_sql[:condition]
  count = parsed_sql[:count]
  # not implemented:
  # distinct = parsed_sql[:distinct]
  sqlopts, casopts = rowopts(parsed_sql)

  if count and cond.empty? and sqlopts.empty?
    [{count => @connection.count_range(cf, casopts)}]
  elsif is_id?(cond)
    ks = [cond].flatten
    @connection.multi_get(cf, ks, casopts).values
  else
    rows = @connection.get_range(cf, casopts).select {|i| i.columns.length > 0 }.map do |key_slice|
      key_slice_to_hash(key_slice)
    end

    unless cond.empty?
      rows = filter(cond).call(rows)
    end

    if (offset = sqlopts[:offset])
      rows = rows.slice(offset..-1)
    end

    if (limit = sqlopts[:limit])
      rows = rows.slice(0, limit)
    end

    count ? [{count => rows.length}] : rows
  end
end

#supports_count_distinct? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/cassandra_adapter.rb', line 33

def supports_count_distinct?
  false
end

#update_sql(sql, name = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/cassandra_adapter.rb', line 95

def update_sql(sql, name = nil)
  log(sql, name)
  parsed_sql = ActiveCassandra::SQLParser.new(sql).parse
  cf = parsed_sql[:table].to_sym
  cond = parsed_sql[:condition]

  nvs = {}
  parsed_sql[:set_clause_list].each do |n, v|
    n = n.split('.').last
    nvs[n] = v.to_s
  end

  n = 0

  if is_id?(cond)
    ks = [cond].flatten
    rs = @connection.multi_get(cf, ks)

    ks.each do |key|
      row = rs[key]
      @connection.insert(cf, key, row.merge(nvs))
      n += 1
    end
  else
    rows = @connection.get_range(cf).select {|i| i.columns.length > 0 }.map do |key_slice|
      key_slice_to_hash(key_slice)
    end

    unless cond.empty?
      rows = filter(cond).call(rows)
    end

    rows.each do |row|
      @connection.insert(cf, row['id'], row.merge(nvs))
      n += 1
    end
  end

  return n
end