http://debianws.lexgopc.com/wiki143/index.php?action=history&feed=atom&title=DataMapperDataMapper - Revision history2026-05-10T06:22:52ZRevision history for this page on the wikiMediaWiki 1.43.1http://debianws.lexgopc.com/wiki143/index.php?title=DataMapper&diff=6932617&oldid=previmported>Bearian: Easily passes SIGCOV
Deprodding2025-03-29T18:27:42Z<p>Easily passes SIGCOV Deprodding</p>
<p><b>New page</b></p><div>{{Short description|Software library}}<br />
'''DataMapper''' is an [[Object-relational mapping|object-relational mapper]] [[programming library|library]] written in [[Ruby (programming language)|Ruby]] that follows the [[active record pattern]] even though the name implies it follows the [[data mapper pattern]]. While DataMapper 1 may not have achieved total decoupling between object and database suggested by the data mapper pattern, it appears DataMapper 2 intended to change this (''a la'' Virtus, a library adapted from DataMapper).<ref>{{cite web|url=https://github.com/datamapper/dm-core/wiki/Roadmap|title=datamapper wiki: Roadmap|publisher=[[GitHub]]}}</ref> The DataMapper 2 project was renamed before launch and was released as '''Ruby Object Mapper (ROM) in August 2013.<ref>{{cite web|url=https://groups.google.com/forum/#!topic/datamapper/ng-e4kYaCck|title=Where is DataMapper 2?|publisher=[[Google Groups]]}}</ref>'''<br />
<br />
Some features of DataMapper:<ref>{{Cite web |url=http://datamapper.org/why |title=DataMapper - Why DataMapper? |access-date=2010-10-12 |archive-date=2010-10-08 |archive-url=https://web.archive.org/web/20101008025706/http://datamapper.org/why |url-status=dead }}</ref><br />
* Eager loading of child associations to avoid (N+1) queries<br />
* Lazy loading of select properties, e.g., larger fields<br />
* Query chaining, and not evaluating the query until absolutely necessary (using a lazy array implementation)<br />
* An API not too heavily oriented to SQL databases<br />
<br />
DataMapper was designed to be a more abstract ORM, not strictly SQL, based on [[Martin Fowler (software engineer)|Martin Fowler]]'s enterprise pattern.<ref>{{cite book<br />
| last = Fowler | first = Martin<br />
|author2=David Rice |author3=Matthew Foemmel |author4=Edward Hieatt |author5=Robert Mee |author6=Randy Stafford<br />
| title = Patterns of Enterprise Application Architecture<br />
| publisher = Addison-Wesley<br />
|date=November 2002<br />
| isbn = 0-321-12742-0<br />
}}</ref> As a result, DataMapper adapters have been built for other non-SQL databases, such as [[CouchDB]],<ref>{{Cite web |url=https://github.com/kabari/dm-couchdb-adapter/tree/master |title=Kabari's dm-couchdb-adapter at master - GitHub |website=[[GitHub]] |access-date=2016-01-02 |archive-url=https://web.archive.org/web/20090827004529/http://github.com/kabari/dm-couchdb-adapter/tree/master |archive-date=2009-08-27 |url-status=dead}}</ref> [[Apache Solr]],<ref>{{Cite web|url=https://github.com/lritter/dm-solr-adapter/tree/master|title=Lritter/Dm-solr-adapter|website=[[GitHub]]|date=13 August 2019}}</ref> and webservices such as [[Salesforce.com]].<ref>{{Cite web|url=https://github.com/halorgium/dm-salesforce/tree/master|title=Dm-salesforce|website=[[GitHub]]|date=22 February 2020}}</ref><br />
<br />
==References==<br />
{{reflist}}<br />
<br />
==External links==<br />
* [http://datamapper.org/ DataMapper homepage]<br />
<br />
[[Category:Object–relational mapping]]<br />
<br />
<br />
{{database-software-stub}}<br />
<br />
[[cs:Data Mapper]]</div>imported>Bearian