たとえば
%name = "name";
%word="It's ok";
SQL s="select * from Product where #{name} = #{word} ";
は
select * from Product where 'name' = 'It\'s ok';
と解釈される.
Symbol name = "name";
%word="It's ok";
SQL s="select * from Product where #{name} = #{word} ";
としなければならない.
エラーがふえてやる気をなくすかも?