ECL (data-centric programming language): Difference between revisions

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{{Short description|None}}

{{Infobox programming language

| name = ECL

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| influenced_by = [[Prolog]], [[Pascal (programming language)|Pascal]], [[SQL]], [[Snobol4]], [[C++]], [[Clarion (programming language)|Clarion]]

| influenced =

| operating_system = [[GNU]]/[[Linux kernel|Linux]]

| license =

| website = http://hpccsystems.com/

}}

'''ECL''' (Enterprise Control Language) is a declarative, data-centric programming language designed in 2000 to allow a team of programmers to process [[big data]] across a high performance computing cluster without the programmer being involved in many of the lower level, imperative decisions.<ref>[http://www.lexisnexis.com/risk/about/guides/program-guide.html A Guide to ECL], [[Lexis-Nexis]].</ref><ref>"Evaluating use of data flow systems for large graph analysis," by A. Yoo, and I. Kaplan. Proceedings of the 2nd Workshop on Many-Task Computing on Grids and Supercomputers, MTAGS, 2009</ref>

== History ==

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Perhaps a more flavorful example would take a list of strings, sort them into order, and then return that as a result instead.

<sourcesyntaxhighlight lang="ecl">

// First declare a dataset with one column containing a list of strings

// Datasets can also be binary, CSV, XML or externally defined structures

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SD := SORT(D,Value);

output(SD)

</syntaxhighlight>

</source>

The statements containing a <code>:=</code> are defined in ECL as attribute definitions. They do not denote an action; rather a definition of a term. Thus, logically, an ECL program can be read: "bottom to top"

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What is an SD?

<sourcesyntaxhighlight lang="ecl">

SD := SORT(D,Value);

</syntaxhighlight>

</source>

SD is a D that has been sorted by ‘Value’

What is a D?

<sourcesyntaxhighlight lang="ecl">

D := DATASET([{'ECL'},{'Declarative'},{'Data'},{'Centric'},{'Programming'},{'Language'}],{STRING Value;});

</syntaxhighlight>

</source>

D is a dataset with one column labeled ‘Value’ and containing the following list of data.

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== External links ==

* [http://rosettacode.org/wiki/ECL Rosetta Code ECL category]

* [https://hpccsystems.com/training/documentation/ecl-language-reference/html ECL Language Reference] {{Webarchive|url=https://web.archive.org/web/20210116135748/https://hpccsystems.com/training/documentation/ecl-language-reference/html |date=2021-01-16 }}

* [https://www.nytimes.com/2008/02/21/technology/21iht-reed.4.10279549.html Reed Elsevier to acquire ChoicePoint for $3.6 billion]

* [https://www.bloomberg.com/apps/news?pid=newsarchive&sid=aBuqYZDOSPL4&refer=uk Reed Elsevier's LexisNexis Buys Seisint for $775 Mln]

* [https://archive.today/20130201091208/http://www.reuters.com/finance/stocks/keyDevelopments?symbol=ENL&pn=15 Reed Elsevier]

[[Category:Declarative programming languages]]

[[Category:Data-centric programming languages]]

[[Category:Big data]]

[[Category:Statically typed programming languages]]