Class: CassandraObject::Schema

Inherits:
Object
  • Object
show all
Defined in:
lib/cassandra_object/schema.rb

Constant Summary collapse

DEFAULT_CREATE_KEYSPACE = 
{
  'strategy_class' => 'SimpleStrategy',
  'strategy_options' => 'replication_factor:1'
}

Class Method Summary collapse

Class Method Details

.add_index(column_family, column, index_name = nil) ⇒ Object 



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# File 'lib/cassandra_object/schema.rb', line 54

def add_index(column_family, column, index_name = nil)
  stmt = "CREATE INDEX #{index_name.nil? ? '' : index_name} ON #{column_family} (#{column})"
  keyspace_execute stmt
end

.alter_column_family(column_family, instruction, options = {}) ⇒ Object 



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# File 'lib/cassandra_object/schema.rb', line 41

def alter_column_family(column_family, instruction, options = {})
  stmt = "ALTER TABLE #{column_family} #{instruction}"
  keyspace_execute adapter.statement_with_options(stmt, options)
end

.create_column_family(column_family, options = {}) ⇒ Object 



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# File 'lib/cassandra_object/schema.rb', line 33

def create_column_family(column_family, options = {})
  create_table column_family, options
end

.create_keyspace(keyspace, options = nil) ⇒ Object 



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# File 'lib/cassandra_object/schema.rb', line 12

def create_keyspace(keyspace, options = nil)
  stmt = "CREATE KEYSPACE #{keyspace} WITH REPLICATION = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };"

  options ||= {} #DEFAULT_CREATE_KEYSPACE

  system_execute stmt #adapter.statement_with_options(stmt, options)
end

.create_table(table_name, options = {}) ⇒ Object 



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# File 'lib/cassandra_object/schema.rb', line 37

def create_table(table_name, options = {})
  adapter.create_table table_name, options
end

.drop_column_family(column_family) ⇒ Object 



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# File 'lib/cassandra_object/schema.rb', line 46

def drop_column_family(column_family)
  drop_table column_family
end

.drop_index(index_name) ⇒ Object

If the index was not given a name during creation, the index name is <columnfamily_name>_<column_name>_idx.



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# File 'lib/cassandra_object/schema.rb', line 60

def drop_index(index_name)
  keyspace_execute "DROP INDEX #{index_name}"
end

.drop_keyspace(keyspace, confirm = false) ⇒ Object 



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# File 'lib/cassandra_object/schema.rb', line 20

def drop_keyspace(keyspace, confirm = false)
  if adapter.cassandra_version < 3
    count = (system_execute "SELECT count(*) FROM schema_columnfamilies where keyspace_name = '#{keyspace}' ALLOW FILTERING;").rows.first['count']
  else
    count = (system_schema_execute "SELECT count(*) FROM tables where keyspace_name = '#{keyspace}';").rows.first['count']
  end
  if confirm || count == 0
    system_execute "DROP KEYSPACE #{keyspace}"
  else
    raise "Cannot drop keyspace #{keyspace}. You must delete all tables before"
  end
end

.drop_table(table_name, confirm = false) ⇒ Object 



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# File 'lib/cassandra_object/schema.rb', line 50

def drop_table(table_name, confirm = false)
  adapter.drop_table table_name, confirm
end