正则表达式用\ r \ n替换\ r后面没有后跟\ n的所有实例(Regex to replace all instances of \r not followed by \n with \r\n)

 我可以建议2种基本方法（还有其他选择）。 
 根据特定的设计和上下文需求来选择它们。 
 
 第一个 - 允许仅删除有效记录（推荐）。 
 此方法限制了允许的操作，仅允许有效操作。 
 例如，这可以通过从有效选项的只读列表中选择ID来完成。 一旦删除 - ID就会被删除，并且不再出现在GUI中。 
 
 第二个 - 允许所有内容，但在执行之前或之后检查，然后（在两种情况下），向用户显示适当的消息。 
 例如，这可以通过使用executeUpdate()来完成，该函数返回已更改的行数（在您的情况下删除），如果没有受影响，则返回0。 
 
 这两个选项都被广泛用于限制用户交互并提供基本指导。 
 但是，在CRUD应用程序中，您需要仔细考虑任一选项如何影响您的应用程序，以及这两种实现的结果。 

I can suggest 2 basic approaches (there are additional options ofcourse).
 Choosing between them is done per specific design and context needs.
 
The first - allow to delete only valid records (recommended).
 This approach limits the allowed operations and permits only valid operations.
 This can be done, for example, by selecting the IDs from a read-only list of valid options. Once deleted - the ID is simply removed and does not appear anymore in the GUI. 
 
The second - allow everything, but check either before execution or after the fact, and then (in both cases), display an appropriate message to the user.
 This can be done, for example, by using executeUpdate() which returns the number of rows which were changed (deleted in your case), or 0 if none were affected.
 
Both options are widely used to limit user interactions and provide basic guiding.
 In CRUD applications, however, you need to consider carefully how either option can affect your application, and what would be the results of either implementation.