Aprial 9th Monday (四月　九日　月曜日)

概述  Today I created a abstract layer for accessing a database in PHP.  This class includes such operator  as "connect", "disconnect", "executeQuery", and so forth.  My purpose is to provide a uniform in

Today I created a abstract layer for accessing a database in PHP. This class includes such operator
as "connect","disconnect","executequery",and so forth. My purpose is to provIDe a uniform interface
of accessing database. So,I created two sub classes of that class. One is to access MysqL database.
Another is to access Postgresql database.

To seek a property sub classes I created a special class to adapt a sub class in according to a argument.That is a factory class,in acutal fact,it is a adaptation.

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