使用多个前缀生成id [英] Generate id with multiple prefix
问题描述
我希望生成不同的id，因为我有一个具有不同城市名称和文本框的组合框。当我从组合框中选择一个城市时，根据它的城市名称，两个初始值将选择并创建一个id。
如果我将十个条目作为同一个城市，那么它将生成为DE01，DE02 ,. ... DE10。
如果我下次选择不同的城市，那么它将生成PU01，PU02，... PU08。
下次如果我想再次进入使用德里市然后它将从数据库中检查它有多少先前的条目然后它将生成DE11，DE12，... DE16。
下次选择旁遮普时它将生成PU09，PU10 ,. ..PU17。
我的尝试：
我只是需要这个解决方案ASAP
i want different id generate as i have a combo box having different cities name and a textbox. when i choose a city from combo box then according to it city name two initial values will pick and create a id.
if i do ten entries as same city then it will generate as DE01,DE02,....DE10.
AND IF next time i choose different city then it will generate PU01,PU02,...PU08.
next time if i want again do entry using delhi city then it will check from database that how many it has previous entries then it will generate DE11,DE12,...DE16.
Next time on choose punjab it will generate PU09,PU10,...PU17.
What I have tried:
I just needed this solution ASAP
推荐答案
我只是需要这个解决方案ASAP
I just needed this solution ASAP
我们不做你的作业：这是有原因的。它就是为了让你思考你被告知的事情，并试着理解它。它也在那里，以便您的导师可以识别您身体虚弱的区域，并将更多的注意力集中在补救措施上。
亲自尝试，你可能会发现它不是和你想的一样困难！
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We do not do your homework: it is set for a reason. It is there so that you think about what you have been told, and try to understand it. It is also there so that your tutor can identify areas where you are weak, and focus more attention on remedial action.
Try it yourself, you may find it is not as difficult as you think!
If you meet a specific problem, then please ask about that and we will do our best to help. But we aren't going to do it all for you!
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