Hi,

I have a question related to sql injection when using a clause like 
this: "User.c.username.like('%' + userinput + '%')"

What restrictions do I have to put on the variable userinput? Of course, 
I will ensure that is no percent character ('%') in userinput. Is that 
enough (assuming that SQLAlchemy will do the rest by applying 
database-specific quoting rules) or do I need to filter more characters? 
Is this specific for database used?

Thank you very much
fs

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