def fetch_size fsz, &block
    obj = self.dup
    obj.instance_variable_set :@fetch_size, fsz
    ret obj, &block
  end
def fetch_size fsz, &block
    obj = self.dup
    obj.instance_variable_set :@fetch_size, fsz
    ret obj, &block
  end
Returns a new TableWrapper object with the given fetch size.
 If a block is given, executes the select statement and yields each row to the block.
 @param [Fixnum] fsz Fetch size
 @return [JDBCHelper::TableWrapper]
 @since 0.7.7