ORM （ object relation mapping ）
即將資料庫表映射成對像，實現通過實例化對像來訪問資料庫
本文主要介紹Propel - smart, easy object persistence
$> pear channel-discover pear.phpdb.org $> pear install phpdb/propel_generator $> pear install phpdb/propel_runtime
Adding Channel
D:\>pear channel-discover pear.phpdb.org Adding Channel "pear.phpdb.org" succeeded Discovery of channel "pear.phpdb.org" succeeded
propel_generator 安裝日誌
D:\php-5.1.4-Win32>pear install phpdb/propel_generator phpdb/propel_generator requires package "channel://pear.phing.info/phing" (versi on >= 2.2.0) downloading creole-1.1.0.tgz ... Starting to download creole-1.1.0.tgz (92,633 bytes) .....................done: 92,633 bytes install ok: channel://pear.phpdb.org/creole-1.1.0
propel_runtime 安裝日誌
D:\php-5.1.4-Win32>pear install phpdb/propel_runtime downloading propel_runtime-1.2.0.tgz ... Starting to download propel_runtime-1.2.0.tgz (45,959 bytes) .............done: 45,959 bytes install ok: channel://pear.phpdb.org/propel_runtime-1.2.0 D:\php-5.1.4-Win32>