Python与DB2 for Linux：连接与高级操作教程

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本资源是一份名为《Using Python to access DB2 for Linux》的教程，主要针对开源编程和高级数据库应用。作者Patrick O'Brien来自Studio B，发布日期为2002年12月17日。教程针对的是中级技能水平的学习者，特别关注如何使用Python与DB2 for Linux 8.1 Enterprise Edition数据库系统进行交互。 Python Database API是一个标准，它定义了Python与数据库管理系统（DBMS）之间接口的实现规范。在这个教程中，DB2模块被介绍为Python Database API的一个实现，使得Python程序员能够方便地从他们的Python程序中访问DB2数据库。这份文档旨在全面讲解Python与DB2的接口，并提供可以在Python交互模式下运行的示例代码。教程的第一部分是介绍，建议学习者分为两类人参加：一是希望在Python项目中利用DB2 V8.1数据库的Python开发者，二是对Python感兴趣并对它在DB2中的应用感兴趣的数据库开发者。Python作为一个强大的工具，结合了快速访问数据库的能力和执行复杂任务的通用性。通过本教程，读者将学到使用Python语言与DB2 V8.1进行有效互动的所有必要知识，包括但不限于数据访问、查询操作、以及如何执行更复杂的数据库操作。内容涵盖了Python API的各个方面，从基本的连接设置，到执行SQL查询、处理结果集、执行事务、以及如何处理数据库异常。此外，教程还会涉及使用预编译语句提高性能，以及如何使用Python的面向对象特性来设计更灵活的数据库操作逻辑。通过跟随教程，无论是经验丰富的Python开发者还是初次接触DB2的用户，都能深入了解如何利用Python与DB2 for Linux进行高效、稳健的数据库管理，从而提升项目的效率和可维护性。

under Linux or Ctrl-Z under Windows.

Displaying variable values

Python's interactive mode has a very handy feature that you will see used in several

of the examples. When you enter a line of code at the Python prompt that consists of

nothing more than the name of a variable, Python responds by displaying a

representation of that variable's value. Here are some examples that illustrate this

feature:

>>> a = 3

>>> b = 5

>>> c = a * b

>>> c

>>> d = c / 2.5

>>> d

6.0

>>> e = 'Hello'

>>> e

'Hello'

>>> f = e * a

>>> f

'HelloHelloHello'

>>>

Multi-line commands

Some Python code requires multiple lines, such as the block of code that gets

executed inside a for loop. In these cases, the Python shell displays a continuation

prompt (...) for each subsequent line. Notice also that a block of code is

determined by its level of indentation, rather than curly braces or BEGIN and END

keywords. In the following example, the lines of code that make up the for loop

block are all indented to the same level (typically four spaces). Pressing Enter

twice in a row tells Python that you're done entering code and are ready for it to be

executed:

>>> for n in range(4):

... print "The first value of n:", n

... print "Multiplied by itself:", n * n

... print "-----------------------"

...

The first value of n: 0

Multiplied by itself: 0

-----------------------

The first value of n: 1

Multiplied by itself: 1

-----------------------

The first value of n: 2

Multiplied by itself: 4

-----------------------

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