文本数据库GNU Recutils
GNU Recutils 1.6 发布，增加对联合查询和外键的支持，支持字段分组和排序，重写了字段表达式的规则，支持聚合函数，改进了 emacs 模式，完善了用户手册等等。
GNU Recutils 是一组工具和开发包用来访问名为 recfiles 的文本数据库。
recfile 包含了顺序记录的数据结构，rec格式支持数据集成和记录描述 (keys, mandatory fields, field types, etc.) ，可用来存储一些简单的中等规模的数据。
数据库, 联合, 查询, 表达式, 函数
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http://www.gnu.org/software/recutils/
Integration with org-mode
Read data from recfiles into a table in an org-mode buffer in Emacs.
Publish the resulting data.
Templates
Generate reports.
Build your own exporters.
Complete user manual
Full description of the format.
Documentation for the utilities.
Usage examples.
Easy deployment
C library: librec
Rich set of utilities to be used in shell scripts and in the command line.
Advanced Emacs mode
Navigation mode and editing mode.
Field folding.
Visual edition of fields driven by types.
User manual.
Advanced database facilities
Joins and foreign keys.
Grouping and sorting.
Aggregate functions.
Encryption Support
Selective: individual fields can be encrypted.
Password-based AES.
Converters from/to other formats
mdb files to recfiles.
csv files to/from recfiles.
GNU Recutils is a set of tools and libraries to access human-editable, plain text databases called recfiles. The data is stored as a sequence of records, each record containing an arbitrary number of named fields. The picture below shows a sample database containing information about GNU packages, along with the main features provided by recutils.
Data Integrity
Mandatory and forbidden fields.
Unique fields and primary keys.
Auto-counters and time-stamps.
Arbitrary constraints.
Rich Type System for Fields
Predefined: integer, real, date, etc.
User-defined: based on regular expressions.