每当我设计数据库时,我总是想知道是否有一种最好的方法来命名数据库中的项目。我经常问自己以下问题:
表名应该是复数吗? 列名应该是单数吗? 我应该为表或列添加前缀吗? 我应该在命名项目时使用大小写吗?
是否有推荐的指导原则来命名数据库中的项?
每当我设计数据库时,我总是想知道是否有一种最好的方法来命名数据库中的项目。我经常问自己以下问题:
表名应该是复数吗? 列名应该是单数吗? 我应该为表或列添加前缀吗? 我应该在命名项目时使用大小写吗?
是否有推荐的指导原则来命名数据库中的项?
当前回答
这里有一个链接,提供了一些选择。我正在寻找一个简单的规范,我可以遵循,而不是依赖于一个部分定义的规范。
http://justinsomnia.org/writings/naming_conventions.html
其他回答
我总是听到这样的争论,即表格是否多元化完全是个人品味的问题,没有最佳实践。我不相信这是真的,尤其是作为一个程序员而不是DBA。据我所知,除了“这对我来说很有意义,因为它是对象的集合”之外,没有其他合理的理由将表名改为复数形式,而使用单数表名在代码中有合理的好处。例如:
It avoids bugs and mistakes caused by plural ambiguities. Programmers aren't exactly known for their spelling expertise, and pluralizing some words are confusing. For example, does the plural word end in 'es' or just 's'? Is it persons or people? When you work on a project with large teams, this can become an issue. For example, an instance where a team member uses the incorrect method to pluralize a table he creates. By the time I interact with this table, it is used all over in code I don't have access to or would take too long to fix. The result is I have to remember to spell the table wrong every time I use it. Something very similar to this happened to me. The easier you can make it for every member of the team to consistently and easily use the exact, correct table names without errors or having to look up table names all the time, the better. The singular version is much easier to handle in a team environment. If you use the singular version of a table name AND prefix the primary key with the table name, you now have the advantage of easily determining a table name from a primary key or vice versa via code alone. You can be given a variable with a table name in it, concatenate "Id" to the end, and you now have the primary key of the table via code, without having to do an additional query. Or you can cut off "Id" from the end of a primary key to determine a table name via code. If you use "id" without a table name for the primary key, then you cannot via code determine the table name from the primary key. In addition, most people who pluralize table names and prefix PK columns with the table name use the singular version of the table name in the PK (for example statuses and status_id), making it impossible to do this at all. If you make table names singular, you can have them match the class names they represent. Once again, this can simplify code and allow you to do really neat things, like instantiating a class by having nothing but the table name. It also just makes your code more consistent, which leads to... If you make the table name singular, it makes your naming scheme consistent, organized, and easy to maintain in every location. You know that in every instance in your code, whether it's in a column name, as a class name, or as the table name, it's the same exact name. This allows you to do global searches to see everywhere that data is used. When you pluralize a table name, there will be cases where you will use the singular version of that table name (the class it turns into, in the primary key). It just makes sense to not have some instances where your data is referred to as plural and some instances singular.
总而言之,如果你将表名改为复数,那么你就失去了让你的代码更聪明、更容易处理的所有优势。甚至在某些情况下,您必须使用查找表/数组来将表名转换为本可以避免的对象或本地代码名。虽然一开始可能感觉有点奇怪,但单数表名比复数表名具有显著优势,我相信这是最佳实践。
不。表应该以它所代表的实体命名。 Person,而不是persons是指记录所代表的人。 同样的事情。列FirstName真的不应该被称为FirstNames。这完全取决于你想用列表示什么。 不。 是的。为清晰起见。如果你需要像“FirstName”这样的列,大小写会让它更容易阅读。
好的。这是我的0.02美元
我认为这些问题的最佳答案将由您和您的团队给出。有一个命名约定比命名约定的具体方式重要得多。
因为这个问题没有正确答案,你应该花点时间(但不要太多)选择你自己的习惯——这是重要的部分——坚持它。
当然,寻求一些关于标准的信息是很好的,这就是你要问的,但不要因为你可能得到的不同答案的数量而焦虑或担心:选择一个对你来说更好的答案。
以防万一,以下是我的答案:
是的。表是一组记录,老师或演员,所以…复数。 是的。 我不用它们。 我经常使用的数据库——Firebird——所有内容都是大写的,所以没关系。不管怎样,当我在编程时,我以一种更容易阅读的方式写名字,比如releaseYear。
表名一定要保持单数,person而不是people 我也一样 不。我见过一些糟糕的前缀,以至于声明我们处理的是一个表(tbl_)或一个用户存储过程(usp_)。后面跟着数据库名…不要这样做! 是的。我倾向于PascalCase我所有的表名
这里有一个链接,提供了一些选择。我正在寻找一个简单的规范,我可以遵循,而不是依赖于一个部分定义的规范。
http://justinsomnia.org/writings/naming_conventions.html