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什么时候应该设置保留字段？ #537

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millionkn opened this issue Jul 29, 2017 · 2 comments
Open

什么时候应该设置保留字段？ #537

millionkn opened this issue Jul 29, 2017 · 2 comments

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@millionkn
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在看一些比较底层代码的时候，偶尔会看到有一些保留字段用作未来的拓展。那么什么时候应该设置保留字段呢？代码的设计者是由于有想法没有实现而设置保留字段呢还是拍拍脑袋根据感觉来设置呢？
@wayss000
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wayss000 commented Aug 1, 2017

搜了一个答案，不知道是不是你想要的：http://www.cnblogs.com/AloneZ/p/java1.html

@mzanthem
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设计业务系统的时候，数据库一般都会有1-5个reserve作为保留字段

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@wayss000 @mzanthem @millionkn