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Software Engineering

928The Object-Relational Impedance Mismatch Problem
929Structural Differences: Objects vs. Tables
930Identity Mismatch: Object Identity vs. Primary Keys
931Association Mismatch: References vs. Foreign Keys
932Inheritance and Relational Mapping Strategies
933Data Type and Granularity Mismatches
934Navigational vs. Set-Based Access Patterns
935Active Record Pattern
936Data Mapper Pattern
937Repository Pattern
938Unit of Work Pattern
939Identity Map Pattern
940Lazy Loading vs Eager Loading
941Query Object Pattern
942Inheritance Mapping Strategies
943Association Mapping Patterns
944The N+1 Query Problem
945Eager Loading and Fetch Strategies
946SELECT N+1 in Collections and Loops
947Cartesian Product Explosion
948Write Performance and Batch Operations
949The Object Graph Problem
950Session and Transaction Management
951When to Drop Down to SQL
952Scenarios Where ORMs Shine
953When to Avoid ORMs
954The Hybrid Approach
955ORMs in Domain-Driven Design
956Team and Project Considerations
957Migration Strategies

Software Engineering

928The Object-Relational Impedance Mismatch Problem
929Structural Differences: Objects vs. Tables
930Identity Mismatch: Object Identity vs. Primary Keys
931Association Mismatch: References vs. Foreign Keys
932Inheritance and Relational Mapping Strategies
933Data Type and Granularity Mismatches
934Navigational vs. Set-Based Access Patterns
935Active Record Pattern
936Data Mapper Pattern
937Repository Pattern
938Unit of Work Pattern
939Identity Map Pattern
940Lazy Loading vs Eager Loading
941Query Object Pattern
942Inheritance Mapping Strategies
943Association Mapping Patterns
944The N+1 Query Problem
945Eager Loading and Fetch Strategies
946SELECT N+1 in Collections and Loops
947Cartesian Product Explosion
948Write Performance and Batch Operations
949The Object Graph Problem
950Session and Transaction Management
951When to Drop Down to SQL
952Scenarios Where ORMs Shine
953When to Avoid ORMs
954The Hybrid Approach
955ORMs in Domain-Driven Design
956Team and Project Considerations
957Migration Strategies

← Software Engineering

Lesson 939 of 1,933·29. Object-Relational MappingPro lesson

Identity Map Pattern

Maintaining a cache of loaded objects to ensure only one instance per database row exists in memory.

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