28

此查询创建一个 mysql 视图，该视图在一个表中捕获错误的电子邮件地址格式。因此，如果插入一行rtrrg.com作为电子邮件，它将被记录在视图中。我的问题是，如何使视图跟踪不止一张表。第二张桌子。

SQL

CREATE VIEW `invalid_emails` AS 
  select `table_with_email_column`.`email` AS `invalidemail` 
    from `table_with_email_column` 
   where ((locate(_latin1'', ltrim(rtrim(`table_with_email_column`.`email`))) <> 0) 
      or (left(ltrim(`table_with_email_column`.`email`), 1) = _latin1'@') 
      or (right(rtrim(`table_with_email_column`.`email`), 1) = _latin1'.') 
      or ((locate(_latin1'.', `table_with_email_column`.`email`,locate(_latin1'@', `table_with_email_column`.`email`)) -  locate(_latin1'@', `table_with_email_column`.`email`)) <= 1) 
      or ((length(ltrim(rtrim(`table_with_email_column`.`email`))) -  length(replace(ltrim(rtrim(`table_with_email_column`.`email`)), _latin1'@', _latin1''))) <> 1) 
      or (locate(_latin1'.', reverse(ltrim(rtrim(`table_with_email_column`.`email`)))) < 3) 
      or (locate(_latin1'.@', `table_with_email_column`.`email`) <> 0) 
      or (locate(_latin1'..', `table_with_email_column`.`email`) <> 0));
4

7 回答 7

84

您可以使用 pureSELECT来验证电子邮件地址：

SELECT * FROM `users` WHERE `email` NOT REGEXP '^[^@]+@[^@]+\.[^@]{2,}$';

现在对于跟踪多个表的问题，您可以使用逗号分隔的表名吗？

SELECT * FROM `users`, `customers`, `clients`
         WHERE `email` NOT REGEXP "^[a-zA-Z0-9][a-zA-Z0-9.!#$%&'*+-/=?^_`{|}~]*?[a-zA-Z0-9._-]?@[a-zA-Z0-9][a-zA-Z0-9._-]*?[a-zA-Z0-9]?\\.[a-zA-Z]{2,63}$";
于 2012-10-06T12:15:53.893 回答
14

对于正确的电子邮件验证，您可以使用此正则表达式，如下所示：

SELECT
    *
FROM
    `school`
WHERE
    `email` NOT REGEXP '^[a-zA-Z0-9][a-zA-Z0-9._-]*[a-zA-Z0-9._-]@[a-zA-Z0-9][a-zA-Z0-9._-]*[a-zA-Z0-9]\\.[a-zA-Z]{2,63}$';
于 2015-12-11T13:00:20.200 回答
5

简单SELECT的语句就足够了，例如：

 SELECT * FROM user WHERE email NOT 
 REGEXP '^[a-zA-Z0-9][+a-zA-Z0-9._-]*@[a-zA-Z0-9][a-zA-Z0-9._-]*[a-zA-Z0-9]*\\.[a-zA-Z]{2,4}$'

此查询处理带有+符号的 Gmail 地址和主机为单个字母的地址。

于 2018-07-18T13:20:02.873 回答
1

您可以在中使用 a UNION，VIEW但是您必须重复所有WHERE为您提供冗余代码的语句。因此，您将创建一个VIEW使您成为 a 的助手，UNION然后应用该WHERE子句。

演示在这里：SQL Fiddle 演示。

这将以某种方式适用于您的 SQL（未经测试）；

CREATE VIEW `invalid_emails_helper` AS
  select `table_with_email_column`.`email` AS `invalidemail` 
    from `table_with_email_column` 
union
  select `table_with_email_column`.`email` 
    from `second_table_with_email_column` 

CREATE VIEW `invalid_emails` AS 
  select `invalidemail` as `email`
    from `invalid_emails_helper` as `table_with_email_column` 
   where ((locate(_latin1'', ltrim(rtrim(`table_with_email_column`.`email`))) <> 0) 
      or (left(ltrim(`table_with_email_column`.`email`), 1) = _latin1'@') 
      or (right(rtrim(`table_with_email_column`.`email`), 1) = _latin1'.') 
      or ((locate(_latin1'.', `table_with_email_column`.`email`,locate(_latin1'@', `table_with_email_column`.`email`)) -  locate(_latin1'@', `table_with_email_column`.`email`)) <= 1) 
      or ((length(ltrim(rtrim(`table_with_email_column`.`email`))) -  length(replace(ltrim(rtrim(`table_with_email_column`.`email`)), _latin1'@', _latin1''))) <> 1) 
      or (locate(_latin1'.', reverse(ltrim(rtrim(`table_with_email_column`.`email`)))) < 3) 
      or (locate(_latin1'.@', `table_with_email_column`.`email`) <> 0) 
      or (locate(_latin1'..', `table_with_email_column`.`email`) <> 0));

regex是的，使用在互联网上随处可见的 as 来检查电子邮件地址的查询进一步简化了它。

于 2012-10-06T13:55:33.220 回答
0 
SELECT
    *
FROM
    users
WHERE
    email NOT REGEXP ‘ ^[ a - zA - Z0 - 9 ][ a - zA - Z0 - 9._ -]*[ a - zA - Z0 - 9 ]@[ a - zA - Z0 - 9 ][ a - zA - Z0 - 9._ -]*[ a - zA - Z0 - 9 ]\.[ a - zA - Z ]{ 2,
    63 } $’
于 2012-10-06T12:25:42.693 回答
0 
select EmailAddress from FindInvalidEmailAddressDemo
   -> where EmailAddress NOT LIKE '%_@_%._%';
于 2022-01-28T04:41:14.400 回答
0

使用 MySQL 9，您现在可以创建一个检查约束，该约束将验证存储在电子邮件地址列中的所有数据。这是一个ALTER TABLE声明：

ALTER TABLE `user` 
ADD CONSTRAINT `user.email_validation` 
    CHECK (`email` REGEXP "^[a-zA-Z0-9][a-zA-Z0-9.!#$%&'*+-/=?^_`{|}~]*?[a-zA-Z0-9._-]?@[a-zA-Z0-9][a-zA-Z0-9._-]*?[a-zA-Z0-9]?\\.[a-zA-Z]{2,63}$");
于 2022-02-02T06:48:15.167 回答