HTSQL 2.0.0b4

Query language for the accidental programmer

HTSQL (“Hyper Text Structured Query Language”) is a high-level query language for relational databases. The target audience for HTSQL is the accidental programmer – one who is not a SQL expert, yet needs a usable, comprehensive query tool for data access and reporting.

HTSQL is also a web service which takes a request via HTTP, translates it into a SQL query, executes the query against a relational database, and returns the results in a format requested by the user agent (JSON, CSV, HTML, etc.).

Use of HTSQL with open source databases (PostgreSQL, MySQL, SQLite) is royalty free under BSD-style conditions. Use of HTSQL with proprietary database systems (Oracle, Microsoft SQL) requires a commercial license. See LICENSE for details.

For installation instructions, see INSTALL. For list of new features in this release, see NEWS. HTSQL documentation is in the doc directory.

http://htsql.org/

The HTSQL homepage

http://htsql.org/doc/examples.html

Examples of HTSQL syntax

http://htsql.org/doc/tutorial.html

The HTSQL tutorial

http://bitbucket.org/prometheus/htsql

HTSQL source code

irc://irc.freenode.net#htsql

IRC chat in #htsql on freenode

http://lists.htsql.org/mailman/listinfo/htsql-users

The mailing list for users of HTSQL

Generous support for HTSQL was provided by Prometheus Research, LLC and The Simons Foundation. This material is also based upon work supported by the National Science Foundation under Grant #0944460. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

HTSQL is copyright by Prometheus Research, LLC. HTSQL is written by Clark C. Evans <[e-mail]> and Kirill Simonov <[e-mail]>.

List of Changes

2.0.0 beta 4 (2010-12-05)

• Refactored peep-hole optimization of the frame tree and SQL serialization; refined the generated SQL.

• Refactored the internal API for adding functions.

• Added new (experimental) syntax for infix function call.

• Added an “Examples” section to the documentation.

• Fixed compatibility with Python 2.5.

• Many minor bugfixes, documentation updates, etc.

2.0.0 beta 3 (2010-11-09)

• Refactored the translator from the term tree to the frame tree; added a new translation step to collapse nested frames and reduce SQL expressions.

• Added the HTRAF demo: use HTSQL with client-side javascript to define complex dashboards.

• Added the SSI demo: using HTSQL for web without giving direct access to the database.

• Updated the tutorial, minor bugfixes, regression test updates, etc.

2.0.0 beta 2 (2010-10-01)

• Refactored the translator from the expression graph to the term tree.

• Added Content-Disposition header to :json and :csv renderers.

• Merged the tutorial to the repository.

2.0.0 beta 1 (2010-09-21)

• Initial beta release.

• PostgreSQL and SQLite backends are (mostly) supported, the former more than the latter.

• The SQL translator needs more work, in particular, the term tree, the frame structure and the serializer.

• Lots of functions are either not implemented or missing a proper serializer, especially in the SQLite backend.

• Other areas which need more work before the final release: rendering, introspection, regression tests and documentation.