Wildcards in MySQL like statements: percent, underscore, and escape

MySql Of like The wildcard in the statement ： Percent sign 、 Underline and escape

%： Represents any one or more characters . Matches characters of any type and length .
Sql Code
select * from user where username like ‘%huxiao’;

select * from user where username like ‘huxiao%’;

select * from user where username like ‘%huxiao%’;
in addition , If you need to find out u_name There is already “ 3、 ... and ” And then there is “ cat ” The record of , Please use and Conditions

SELECT * FROM ［user］ WHERE u_name LIKE ‘% 3、 ... and %’ AND u_name LIKE ‘% cat %’

If you use SELECT * FROM ［user］ WHERE u_name LIKE ‘% 3、 ... and % cat %’

Although we can find out “ Three legged cat ”, But you can't find the right ones “ Zhang maosan ”.

_： Represents any single character . Match a single arbitrary character , It is often used to limit the character length of an expression ：（ Can represent a Chinese character ）

Sql Code
select * from user where username like ‘_’;

select * from user where username like ‘huxia_’;

select * from user where username like ‘h_xiao’;

If I really want to check % perhaps _, What shall I do? ？ Use escape, After the escape character % or _ It's not a wildcard , Note that there is no escape character before % and _ It still works as a wildcard
Sql Code
select username from gg_user where username like ‘%xiao/_%’ escape ‘/’;

select username from gg_user where username like ‘%xiao/%%’ escape ‘/’;

Reproduced source ：http://www.cnblogs.com/wicub