Class ActiveRecord::ConnectionAdapters::SchemaCache < Object

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 7
def initialize(conn)
  @connection = conn
  @tables     = {}

  @columns = Hash.new do |h, table_name|
    h[table_name] = connection.columns(table_name, "#{table_name} Columns")
  end

  @columns_hash = Hash.new do |h, table_name|
    h[table_name] = Hash[columns[table_name].map { |col|
      [col.name, col]
    }]
  end

  @primary_keys = Hash.new do |h, table_name|
    h[table_name] = table_exists?(table_name) ? connection.primary_key(table_name) : nil
  end
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 53
def clear!
  @columns.clear
  @columns_hash.clear
  @primary_keys.clear
  @tables.clear
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 61
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 34
def columns(table = nil)
  if table
    @columns[table]
  else
    @columns
  end
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 44
def columns_hash(table = nil)
  if table
    @columns_hash[table]
  else
    @columns_hash
  end
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 27
def table_exists?(name)
  return @tables[name] if @tables.key? name

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