Oracle 11g - 使用 RegEx 检查约束
我正在使用 Oracle 11g，并尝试创建一个表，定义对创建的约束.
I'm using Oracle 11g, and trying to create a table define constraints on the creation.
我试图添加检查约束来验证一些信息(如电子邮件地址、电话号码等...)
I was trying to add check constraint to validate some information (like e-mail address, phone number, etc...)
Oracle 11g 中是否有允许我执行此类操作的内容?
Is there something in Oracle 11g that would allow me to do something like this?
constraint CK_CONSTRAINT_NAME check (EMAIL like 'REGEX')
我想使用的正则表达式(从 regexLib 中抓取)是:
The regEx I wanted to use (grabbed from regexLib) is:
^[a-zA-Z][a-zA-Z0-9_.-]+@([a-zA-Z0-9-]{2,}.)+([a-zA-Z]{2,4}|[a-zA-Z]{2}.[a-zA-Z]{2})$
我认为 Oracle 11g(如果我错了请纠正我)不支持 RegEx 的这种格式...
I think Oracle 11g (correct me if I'm wrong) doesn't support this format for RegEx...
我见过使用 REGEX_LIKE 的方法，但它似乎只适用于 WHERE 子句.
I've seen methods using REGEX_LIKE, but it seems to only work in WHERE clauses.
我想将其保留为检查约束，而不是触发器或外部函数/脚本.
I'd like to keep it as a check constraint and not a trigger or an external function/script.
另外，我在这里读过其他主题，有人说 RegEx' 不是验证电子邮件地址格式和此类信息的好方法.评论中没有给出原因，如果有原因，我想知道为什么！
Also, I've read in other threads here, someone saying RegEx' are not a good way of verifying e-mail address format and such information. No reason was given in the comment, and I'd like to know why, if a reason there is!
推荐答案
检查约束遵循与 WHERE 子句的条件相同的语法规则:
A check constraint follows the same syntax rules as conditions for a WHERE clause:
alter table foo
add constraint check_email
check (REGEXP_LIKE(email,'your_regex_goes_here','I'));
手册中的更多详细信息:
More details in the manual:
- 对于 Oracle 11 - http://docs.oracle.com/cd/E11882_01/server.112/e41084/conditions007.htm#SQLRF52141
- 对于 Oracle 12 - https://docs.oracle.com/database/121/SQLRF/conditions007.htm#SQLRF52141
但是，您可以在检查约束中实际使用的内容有一些限制:
There are however some restrictions on what you can actually use in a check constraint:
- Oracle 11 - http://docs.oracle.com/cd/E11882_01/server.112/e41084/clauses002.htm#SQLRF52205
- Oracle 12 - https://docs.oracle.com/database/121/SQLRF/clauses002.htm#SQLRF52205
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