Statement每次执行sql语句,数据库都要执行sql语句的编译. 最好用于仅执行一次查询并返回结果的情形，效率高于PreparedStatement.
Prepared statements offer better performance, as they are pre-compiled. Use when you plan to use the SQL statements many times.
Prepared statements are more secure because they use bind variables, which can prevent SQL injection attack.