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    Upvotes481edited Feb 19, 2018 at 4:14

    Introduction

    Object-Relational Mapping (ORM) is a technique that lets you query and manipulate data from a database using an object-oriented paradigm. When talking about ORM, most people are referring to a library that implements the Object-Relational...

    book_list = new List();
    sql = "SELECT book FROM library WHERE author = 'Linus'";
    data = query(sql); // I over simplify ...
    while (row = data.next())
    {
    book = new Book();
    book.setAuthor(row.get('author');
    book_list.add(book);
    }

    With an ORM library, it would look like this:

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  3. Stack Overflow
    https://stackoverflow.com/questions/1279613

    What is an ORM, how does it work, and how should I use one?

     
  4. Stack Overflow
    https://stackoverflow.com/questions/1152299

    What is an Object-Relational Mapping Framework? [duplicate]

    Tags:
    Object-relational mapping
    Framework
  5. Stack Overflow
    https://stackoverflow.com/questions/1567935

    How to map OO inheritence to a relational database scheme?

    Tags:
    Object Relational Mapping
    Object database
    How-to
  6. Stack Overflow
    https://stackoverflow.com/questions/1519140

    orm - Whats the difference between Object Role Modeling and …

    Tags:
    Object Relational Mapping
    Object-relational mapping
    Object-role modeling
  7. Stack Overflow
    https://stackoverflow.com/questions/11988011

    Is there a package for object-relational mapping in R?

    Tags:
    Object Relational Mapping
    Object-relational mapping
    Orm R
  8. Stack Overflow
    https://stackoverflow.com/questions/52459537

    Difference between ORM and Object Mapping? - Stack Overflow

    Tags:
    Stack Overflow
    Object
  9. People also ask
    What is object relational mapping?
    Object Relational Mapping is all about trying to overcome the impedance msimatch between the object world and relational databases. Activerecord for example is a ORM that wraps a row in a database. Hibernate is another popular ORM

    orm - Whats the difference between Object Role Modeling and Object

    stackoverflow.com
    What is object-relational mapping?
    Object-relational mapping (ORM, O/RM, and O/R mapping) in computer software is a programming technique for converting data between incompatible type systems in relational databases and object-oriented programming languages. This creates, in effect, a "virtual object database" that can be used from within the programming language.

    orm - What is an Object-Relational Mapping Framework? - Stack Overflow

    stackoverflow.com
    Why is object relational mapping not done more often?
    I suppose that's not done more often because it would make life too easy. You are comapring Apples to Oranges. Object Relational Mapping is all about trying to overcome the impedance msimatch between the object world and relational databases. Activerecord for example is a ORM that wraps a row in a database.

    orm - Whats the difference between Object Role Modeling and Object

    stackoverflow.com
    What is an ORM (object relational mapper)?
    An ORM (Object Relational Mapper) is a piece/layer of software that helps map your code Objects to your database. Some handle more aspects than others...but the purpose is to take some of the weight of the Data Layer off of the developer's shoulders. Here's a brief clip from Martin Fowler (Data Mapper):

    What is an ORM, how does it work, and how should I use one?

    stackoverflow.com
    What is object mapping?
    About the term "object mapping": it can also mean some other things that necessarily not have any relation to databases or so. For example Jackson might use object mapper to map Json data to some java POJO. I tend to speak (and hear) about ORM when it goes with @Entity & JPA implementations so quite high level / abstraction stuff.

    java - Difference between ORM and Object Mapping? - Stack Overflow

    stackoverflow.com
    What is an object relational mapper?
    Compared to traditional techniques of exchange between an object-oriented language and a relational database, an Object Relational Mapper often reduces the amount of code that needs to be written. This benefit is apparent- but includes a massive pitfall. They tend to overly abstract what is occuring, which obscures what actually is happening.

    Mapping C# objects to database schema - Stack Overflow

    stackoverflow.com
    Feedback
  10. Stack Overflow
    https://stackoverflow.com/questions/7067860

    java - What is Object/relational mapping(ORM) in relation to …

    Tags:
    Object-relational mapping
    Object database
    Mapping Relation
  11. Stack Overflow
    https://stackoverflow.com/questions/4491438

    Why do we need an Object Relational Mapper? - Stack Overflow

    Tags:
    Object Relational Mapping
    Stack Overflow
    Object Relational vs Database Maper
  12. Stack Overflow
    https://stackoverflow.com/questions/4253763

    orm - PHP Object Relational Mapping Framework - Stack Overflow

    Tags:
    Object Relational Mapping
    Stack Overflow
    Object database
  13. Stack Overflow
    https://stackoverflow.com/questions/274090

    orm - Where do I start designing when using O/R mapping?

  14. Stack Overflow
    https://stackoverflow.com/questions/3923611

    c# - object-relational mapping - Stack Overflow

    Tags:
    Object Relational Mapping
    Stack Overflow
    C #
    Mapping Relation
  15. Stack Overflow
    https://stackoverflow.com/questions/3113885

    java - Difference Between One-to-Many, Many-to-One and

    Tags:
    Stack Overflow
    Manytomany vs Onetomany vs Manytoone
    Many-to-one
  16. Stack Overflow
    https://stackoverflow.com/questions/4049056

    Design pattern for object-relational mapping - Stack Overflow

    Tags:
    Stack Overflow
    Object-relational mapping
  17. Stack Overflow
    https://stackoverflow.com/questions/1470787

    How to choose an object relational mapping for .net

    Tags:
    Object Relational Mapping
    Object-relational mapping
    How-to
  18. Stack Overflow
    https://stackoverflow.com/questions/1069187

    How to design many-to-many relationships in an object database?

    Tags:
    Object database
    Many-to-many
  19. Stack Overflow
    https://stackoverflow.com/questions/587634

    java - Object/Relational mapping - Stack Overflow

    Tags:
    Stack Overflow
    Framework
  20. Stack Overflow
    https://stackoverflow.com/questions/16865026

    orm - Relational object mapping c# - Stack Overflow

    Tags:
    Object Relational Mapping
    Stack Overflow
  21. Stack Overflow
    https://stackoverflow.com/questions/3773286

    mysql - How established are ORMs (object relational mapping) in …

    Tags:
    Object Relational Mapping
    Object database
  22. Stack Overflow
    https://stackoverflow.com/questions/17435224

    Mapping C# objects to database schema - Stack Overflow

    Tags:
    Stack Overflow
    Object database
    C #
    Data Access Layer
  23. Stack Overflow
    https://stackoverflow.com/questions/36367807

    laravel Eloquent join and Object-relationship mapping

    Tags:
    Relationship
    Eloquent