Attention using MySQL and prepared statements.
Using a placeholder multiple times inside a statement doesn't work. PDO just translates the first occurance und leaves the second one as is.
select id,name from demo_de where name LIKE :name OR name=:name
You have to use
select id,name from demo_de where name LIKE :name OR name=:name2
and bind name two times. I don't know if other databases (for example Oracle or MSSQL) support multiple occurances. If that's the fact, then the PDO behaviour for MySQL should be changed.
