def default data_hash, &block
    raise ArgumentError.new("Hash required") unless data_hash.kind_of? Hash

    obj = self.dup
    obj.instance_variable_set :@query_default, @query_default.merge(data_hash)
    ret obj, &block
  end
def default data_hash, &block
    raise ArgumentError.new("Hash required") unless data_hash.kind_of? Hash

    obj = self.dup
    obj.instance_variable_set :@query_default, @query_default.merge(data_hash)
    ret obj, &block
  end
Returns a new TableWrapper object with default values, which will be applied to
 the subsequent inserts and updates.
 @param [Hash] data_hash Default values
 @return [JDBCHelper::TableWrapper]
 @since 0.4.5