How to use an user variables in MySQL LIKE clause?

Question

I am trying to setup a few simple SQL scripts to help with some short term DB administration. As such, I\'m setting up variables to try to make it easier to reuse these scri

Answer 1

SET @email = 'test@test.com';

SELECT email from `user` WHERE email LIKE CONCAT('%', @email, '%');

Answer 2

BEGIN 
    SET @emailid = CONCAT('%', 'email@email.com' ,'%');
    SET @t1 =CONCAT('SELECT * FROM user WHERE email LIKE ''', @emailid, '''');
    PREPARE stmt3 FROM @t1;
    EXECUTE stmt3;
    DEALLOCATE PREPARE stmt3;
END

Answer 3

Using same syntax as oracle seems to work:

SELECT email from user WHERE email LIKE '%' || @email || '%';

Answer 4

I resolved using the CONCAT function before using LIKE statement:

SET @email = 'test@test.com';
set @email = CONCAT('%',@email,'%');
SELECT email from `user` WHERE email LIKE @email;

It works fine for me

Answer 5

You may have error

Error Code: 1267. Illegal mix of collations for operation 'like'    0.016 sec

In this case you need to specify the same collation as used for your table like that:

SET @email = 'test@test.com' COLLATE utf8_unicode_ci;

Answer 6

Works without concat():

LIKE '%{$var}%'

(Mysql version 5.+)