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比如,在管理员菜单界面输入1,我需要生成SELECT * FROM commodity并且写入到command.txt文件中

是的

然后可以在代码中进一步加工这个字符串,比如改成SELECT good FROM commodity并将加工后的字符串传入小函数中,小函数需要能够解析传入的字符串并且实现相应功能?

我感觉这个操作似乎没什么必要?你需要的是尝试解析 SELECT * FROM commodity。 当然如果你认为解析SELECT good FROM commodity更好,那么也许你可以直接生成SELECT good FROM commodity写入command.txt。(不考虑格式问题)

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@Price1999a
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@huwenjing0819
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