January 2018
Intermediate to advanced
856 pages
17h 17m
Chinese
Content preview from Python 技術手冊 第三版
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Berkeley DB 介面
|
397
在 v2 中，這兩個範例應該匯入並使用模組
anydbm
而非套件
dbm
。
Berkeley DB 介面
v2 附有
bsddb
套件，它包裹了 Berkeley Database（也叫做 BSD DB）程式
庫，如果你的系統上有安裝那個程式庫而且你的 Python 安裝建置的時候有
設定支援它的話。然而，
bsddb
在 v2 中已被棄用，而在 v3 中則不存在，所
以我們無法推薦它。如果你確實需要對一個 BSD DB 封存檔（archive）的
介面，我們建議改用極佳的第三方套件 bsddb3（
https://pypi.python.org/pypi/
bsddb3
）。
Python Database API（DBAPI）2.0
如我們前面提過的，Python 標準程式庫並沒有內附 RDBMS 介面（除了涵
蓋於「SQLite」的
sqlite3
，它是功能豐富的實作，不只是一個介面）。有
許多第三方的模組都能讓你的 Python 存取特定的 DB。這種模組大多遵循
Python Database API 2.0 標準，也叫做 DBAPI，如 PEP 249（
https://www.
python.org/dev/peps/pep-0249/
）中所規範的。
匯入 DBAPI 相容的模組之後，以 DB 特定的參數呼叫該模組的
connect
函
式。
connect
回傳
x
，它是
Connection
的一個實體，代表對 DB 的一個連
線。
x
支援
commit
和
rollback
方法來處理交易 ...
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