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Data Mapper Pattern
conceptDesign Pattern
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Overview
Developed byMartin Fowler
Use casedecoupling domain objects from database schema
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Claims41
Avg confidence93%
Avg freshness100%
Last updatedUpdated 5 days ago
WikidataQ5227311
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Data Mapper Pattern

concept

Layer of software that separates in-memory objects from database, keeping them independent

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primary use case

ValueTrustConfidenceFreshnessSources
decoupling domain objects from database schema○UnverifiedHighFresh1
Separating domain objects from database access logic○UnverifiedHighFresh1
separating domain objects from database persistence logic○UnverifiedHighFresh1
Keeping domain objects independent of database schema○UnverifiedHighFresh1
mapping between objects and database tables○UnverifiedHighFresh1
object-relational mapping○UnverifiedHighFresh1
Implementing Object-Relational Mapping○UnverifiedHighFresh1
isolating domain logic from data access code○UnverifiedHighFresh1

published in

ValueTrustConfidenceFreshnessSources
Patterns of Enterprise Application Architecture○UnverifiedHighFresh1

supports separation of concerns

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true○UnverifiedHighFresh1

publication year

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2002○UnverifiedHighFresh1

requires

ValueTrustConfidenceFreshnessSources
Separate mapper classes for database operations○UnverifiedHighFresh1

integrates with

ValueTrustConfidenceFreshnessSources
relational databases○UnverifiedHighFresh1
Object-Relational Mapping frameworks○UnverifiedHighFresh1
Unit of Work Pattern○UnverifiedModerateFresh1
Identity Map Pattern○UnverifiedModerateFresh1

developed by

ValueTrustConfidenceFreshnessSources
Martin Fowler○UnverifiedHighFresh1

pattern type

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Enterprise Application Architecture Pattern○UnverifiedHighFresh1

supports model

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Domain Model○UnverifiedHighFresh1
Domain Model Pattern○UnverifiedHighFresh1
Repository Pattern○UnverifiedModerateFresh1

based on

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Enterprise Application Architecture patterns○UnverifiedHighFresh1
Object-Relational Mapping principles○UnverifiedHighFresh1

enables testability

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true○UnverifiedHighFresh1

alternative to

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Active Record Pattern○UnverifiedHighFresh1
Table Data Gateway Pattern○UnverifiedHighFresh1
Table Data Gateway○UnverifiedModerateFresh1

implemented in

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Hibernate○UnverifiedModerateFresh1
SQLAlchemy○UnverifiedModerateFresh1
Doctrine ORM○UnverifiedModerateFresh1

competes with

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Row Data Gateway○UnverifiedModerateFresh1

Alternatives & Similar Tools

Active Record Pattern
alternative to
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Table Data Gateway Pattern
alternative to
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Table Data Gateway
alternative to
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Row Data Gateway
competes with
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Commonly Used With

relational databasesObject-Relational Mapping frameworksUnit of Work PatternIdentity Map Pattern

Related entities

Graph Insights

1 entities depend on Data Mapper Pattern
Doctrine ORM
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Claim count: 41Last updated: 4/5/2026Edit history