Query Abstraction Layer: Difference between revisions

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Revision as of 09:43, 14 January 2016

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| website = {{URL|http://www.optimalbpm.se/wiki/index.php/QAL}}

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'''QAL''' is an open source development project that aims to create a collection of libraries for mixing, moving, merging, substituting and transforming data.;<ref name="sf_project">[https://sourceforge.net/projects/qal/ Sourceforge project page]</ref> also in some cases, such as [[MongoDB]], [[database schema|schema]]s.

And in some cases, like for MongoDB, schemas.

Sources and destinations include different database backends, file formats like [[comma-separated values|<code>.csv</code>]], [[XML]] and spreadsheets. Even [[tag soup|untidy HTML]] web pages can be used as both a source and destination.

For [[:Category:Relational database management systems|SQL/RDBMS backends]], it has a database abstraction layer that supports basic connectivity to Postgres, MySQL, DB2, Oracle and MS SQL server.<ref name="db types">[http://optimalbpm.se/api/qal/_modules/qal/dal/types.html#db_types Database backends]</ref> It uses XML formats(the SQL schema is self-generated) for representation of queries, transformation and merging, making it all scriptable.

It uses XML formats(the SQL schema is self-generated) for representation of queries, transformation and merging, making it all scriptable.

With regards to [[SQL]], QAL uses a subset of [[SQL]] features<ref>[http://optimalbpm.se/api/qal/qal.sql.html#qal.sql.sql SQL features supported]</ref> and data types,<ref>[http://optimalbpm.se/api/qal/_modules/qal/sql/types.html#data_types SQL data types]</ref> which while obviously not complete however is sufficient for most usages. It is however easy to instead use backend specific SQL when the queries do not have to be backend-agnostic.

It is however easy to instead use backend specific SQL when the queries do not have to be backend-agnostic.

It is currently distributed as a Python Library (.egg)<ref>[https://pypi.python.org/pypi/qal PyPi repository page]</ref> and a [[Debian package]] file ([[deb (file format)|<code>.deb</code>]]).<ref>[https://sourceforge.net/projects/qal/files/?source=navbar Downloadable files]</ref>

It is related to the [[Optimal BPM]] ([[Business Process Management]]) project.<ref>[http://www.optimalbpm.se Optimal BPM site]</ref> The Optimal BPM [[SourceForge]] project used to be DAL/QAL.<ref name="Break out"/>

In fact, the Optimal BPM sourceforge project used to be DAL/QAL.<ref name="Break out"/>

==References==

{{Reflist|30em}}

{{CC-notice|cc=zero|url= http://sourceforge.net/projects/qal/ http://sourceforge.net/projects/qal/}}

==External links==

* [http://www.optimalbpm.se/wiki/index.php/ QAL Documentation and examples]

* [http://optimalbpm.se/api/qal/index.html API documentation]

[[Category:Python (programming language)]]

[[Category:Python libraries]]

[[Category:Free software programmed in Python]]

[[Category:Python software]]

[[Category:Cross-platform free software]]