关于数据库移植与PDO的关系有以下几个疑问：
1.网站架构为：Linux+Apache+MySQL+PHP，PHP程序代码关于数据库的操作是用PDO扩展的函数编写而非mysql或mysqli扩展，假如数据库换成oracle（或其他数据库），MySQL中的数据如何移植到oracle中？
2.MySQL与oracle（或其他数据库） 操作数据库的SQL语句是否一样？ 如果不一样，数据库更换时，PHP中关于数据库操作的代码是否需要更改？如果改的话是不是只修改SQL语句就可以？
3.个人理解PDO扩展与其他具体数据库的扩展最大特点就是操作数据库的函数相同，不用在单独去学习各个数据库的扩展函数库，还有就是安全性高点，不知道这样理解对不对？
小弟，是一新手，还请高手朋友给指点迷津！谢谢！
回复讨论(解决方案)
1.处理msyql 数据 语句 成为 oracle 标准的 语句。然后导入
2.具体看你的设计，如果你项目中对数据库的操作，是通过相同的数据库驱动完成的，那么只需要改数据库驱动。否则你懂的
3.pdo是一中操作数据库的方法，不是数据库函数的集合. PDO提供数据库链接，增删改查。最终的执行的都是sql语句.
最简单例子，sql中要用到当前时间、你可以在sql语句中写time_sitestamp() 函数，但是你发现pdo中有当前时间的函数吗
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