PHP的MySQL搜索查询通配符问题

Question

If I search for LENA, I only want to get results where LENA is one word and not part of a word like Lenason or Anna-Lena or Malena

How do I write such a query, not

"select * from users where name like '%LENA%'"

What should it be instead?

Answer 1

Use this one:

select * from users where name like '% LENA %' OR name like 'LENA %' OR name like '% LENA' OR name like 'LENA'

Try it, it will work, and too simple with 2 spaces at start and end. Its long but fast query. You can also use Full Text Search, Concat, Regex ... but for me, I like simple, just add some space before %.

However, you can try shorter but slower query:

SELECT * FROM users  WHERE name REGEXP '(^|\s+)LENA($|\s+)' 

Answer 2

You could use REGEXP :

SELECT fields 
  FROM users
 WHERE name REGEXP '(^|\s+)LENA($|\s+)'

Answer 3

You might be better off looking into Full Text Search for this.

Otherwise I think you're stuck doing something like this

"select * from users WHERE CONCAT(' ',name, ' ') like '% LENA %'"

Which will be pretty inefficient as it requires a full table scan.