Now that the hash is built for the current record, print out the selected fields.
既然已经为当前记录构建了散列，现在就可以打印选定的字段。
If you use the standard INTO clause, the row is filled in the order of the selected fields.
如果使用标准的into子句，那么按选择的字段的次序填充行。
But use these with caution, because users tend to leave pre-selected fields as they are.
但是使用这些时要格外小心，因为用户一般不会去改这些事先选定项。
The subroutine getSelectedFields below shows what these selected fields are for our example.
下面的子程序 getSelectedFields 将显示在我们的示例中这些选定字段是什么。
This structure needs to have fields that have data types compatible with the selected fields.
这个结构必须包含数据类型与选择的字段兼容的字段。
That will result in a valid SQL statement with either one or more fields in the selected fields list.
这将在选定字段列表中产生一个包含一个或多个字段的有效SQL语句 。
For example, a logger that reports all write accesses to selected fields would be a useful aspect to apply in many applications.
例如，报告对所选字段的所有写访问的记录器(logger)在许多应用程序中都会发挥作用。
For example, a logger that reports all write accesses to selected fields would be a useful aspect to apply in many applications.
例如，报告对所选字段的所有写访问的记录器(logger)在许多应用程序中都会发挥作用。
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