Active Record 连接适配器保存点

# File activerecord/lib/active_record/connection_adapters/abstract/savepoints.rb, line 11
def create_savepoint(name = current_savepoint_name)
  internal_execute("SAVEPOINT #{name}", "TRANSACTION")
end

# File activerecord/lib/active_record/connection_adapters/abstract/savepoints.rb, line 7
def current_savepoint_name
  current_transaction.savepoint_name
end

# File activerecord/lib/active_record/connection_adapters/abstract/savepoints.rb, line 15
def exec_rollback_to_savepoint(name = current_savepoint_name)
  internal_execute("ROLLBACK TO SAVEPOINT #{name}", "TRANSACTION")
end

# File activerecord/lib/active_record/connection_adapters/abstract/savepoints.rb, line 19
def release_savepoint(name = current_savepoint_name)
  internal_execute("RELEASE SAVEPOINT #{name}", "TRANSACTION")
end