Snobol4 语言实战：实现数据转换与 ETL 框架实战
ETL（Extract, Transform, Load）是数据仓库领域中一个非常重要的概念，它指的是从数据源中提取（Extract）数据，转换（Transform）数据，然后将转换后的数据加载（Load）到目标系统中。Snobol4 是一种古老的编程语言，虽然它不是现代数据转换和 ETL 工作的主流工具，但我们可以通过学习 Snobol4 来了解编程语言在数据处理中的应用。
本文将围绕 Snobol4 语言，实现一个简单的数据转换与 ETL 框架，通过实际代码示例展示如何使用 Snobol4 进行数据提取、转换和加载。
Snobol4 简介
Snobol4 是一种高级编程语言，由David J. Farber和Ralph E. Griswold于1962年设计。它是一种字符串处理语言，特别适合于文本处理和模式匹配。Snobol4 的语法简洁，易于理解，但它的功能强大，可以处理复杂的字符串操作。
Snobol4 的主要特点包括：
- 强大的字符串处理能力
- 简洁的语法
- 支持模式匹配
- 内置的字符串操作函数
数据转换与 ETL 框架设计
1. 数据提取
数据提取是 ETL 过程的第一步，它涉及到从数据源中获取数据。在 Snobol4 中，我们可以使用文件操作函数来读取数据。
以下是一个简单的 Snobol4 程序，用于从文本文件中提取数据：
snobol
:INFILE
INFILE OPEN
INFILE READ
INFILE CLOSE
这段代码首先打开一个名为 `INFILE` 的文件，然后读取文件内容，最后关闭文件。
2. 数据转换
数据转换是 ETL 过程的核心，它涉及到将提取的数据按照一定的规则进行转换。在 Snobol4 中，我们可以使用内置的字符串操作函数和模式匹配来实现数据转换。
以下是一个 Snobol4 程序，用于将提取的数据中的日期格式从 `YYYY-MM-DD` 转换为 `DD/MM/YYYY`：
```snobol
:INFILE
:OUTFILE
INFILE OPEN
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
INFILE READ
Comments NOTHING