# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 8
def initialize(conn)
  @connection = conn

  @columns      = {}
  @columns_hash = {}
  @primary_keys = {}
  @tables       = {}
  prepare_default_proc
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 30
def add(table_name)
  if table_exists?(table_name)
    @primary_keys[table_name]
    @columns[table_name]
    @columns_hash[table_name]
  end
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 54
def clear!
  @columns.clear
  @columns_hash.clear
  @primary_keys.clear
  @tables.clear
  @version = nil
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 69
def clear_table_cache!(table_name)
  @columns.delete table_name
  @columns_hash.delete table_name
  @primary_keys.delete table_name
  @tables.delete table_name
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 43
def columns(table)
  @columns[table]
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 49
def columns_hash(table)
  @columns_hash[table]
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 76
def marshal_dump
  # if we get current version during initialization, it happens stack over flow.
  @version = ActiveRecord::Migrator.current_version
  [@version] + [@columns, @columns_hash, @primary_keys, @tables].map { |val|
    Hash[val]
  }
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 84
def marshal_load(array)
  @version, @columns, @columns_hash, @primary_keys, @tables = array
  prepare_default_proc
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 18
def primary_keys(table_name)
  @primary_keys[table_name]
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 62
def size
  [@columns, @columns_hash, @primary_keys, @tables].map { |x|
    x.size
  }.inject :+
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 23
def table_exists?(name)
  return @tables[name] if @tables.key? name

  @tables[name] = connection.table_exists?(name)
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 38
def tables(name)
  @tables[name]
end