在 MySQL 中检查字符串是否包含数字?
mysqlmysqli database
要检查字符串是否包含数字，可以使用 regexp，即正则表达式。语法如下 −
SELECT *FROM yourTableName where yourColumnName REGEXP ‘[0-9]’;
为了理解上述语法，让我们创建一个表。创建表的查询如下 −
mysql> create table StringContainsNumber -> ( -> Id int not null auto_increment, -> Words text, -> primary key(Id) -> ); Query OK, 0 rows affected (0.53 sec)
使用 insert 命令在表中插入一些记录。 查询语句如下 −
mysql> insert into StringContainsNumber(Words) values('He12345llo');
Query OK, 1 row affected (0.19 sec)
mysql> insert into StringContainsNumber(Words) values('MySQL is not a programming
4language');
Query OK, 1 row affected (0.17 sec)
mysql> insert into StringContainsNumber(Words) values('Java is an object oriented');
Query OK, 1 row affected (0.18 sec)
mysql> insert into StringContainsNumber(Words) values('Java does not support 456 multiple
inheritance');
Query OK, 1 row affected (0.20 sec)
mysql> insert into StringContainsNumber(Words) values('MySQL is a RDBMS 456');
Query OK, 1 row affected (0.19 sec)
使用 select 语句显示表中的所有记录。查询如下 −
mysql> select *from StringContainsNumber;
以下是输出。
+----+------------------------------------------------+ | Id | Words | +----+------------------------------------------------+ | 1 | He12345llo | | 2 | MySQL is not a programming 4language | | 3 | Java is an object oriented | | 4 | Java does not support 456 multiple inheritance | | 5 | MySQL is a RDBMS 456 | +----+------------------------------------------------+ 5 rows in set (0.00 sec)
这是使用 REGEXP 查找包含数字的字符串的查询 −
mysql> select *from StringContainsNumber where Words regexp '[0-9]';
以下是输出 −
+----+------------------------------------------------+ | Id | Words | +----+------------------------------------------------+ | 1 | He12345llo | | 2 | MySQL is not a programming 4language | | 4 | Java does not support 456 multiple inheritance | | 5 | MySQL is a RDBMS 456 | +----+------------------------------------------------+ 4 rows in set (0.11 sec)
