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01 Persistence And Orm

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Ranjan Kumar
Ranjan Kumar

The document discusses object-relational persistence and different approaches for managing persistent data in object-oriented applications, including ORM. It describes the paradigm mismatch between object-oriented programming and relational databases, specifically problems around granularity, subtypes, identity, associations, and object graph navigation. ORM is presented as a solution that transforms data between object and relational representations using metadata to govern this transformation.

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Object/Relational Persistence and ORM Persistent data in modern object-oriented applications & efficient data management
What is persistence? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What is persistence? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What is persistence? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What is persistence? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What is persistence? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What is persistence? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The persistence layer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Persistence Layer Business Layer Presentation Layer Utility and Helper Classes
Tabular Data vs. Domain Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Domain Model and the paradigm mismatch ,[object Object],[object Object],[object Object],[object Object],1 1..* User userName: String address: String billingDetails: Set BillingDetails accountNumber: String accountName: String accountType: String user: User
Creating tables for the Domain Model ,[object Object],[object Object],create table USER ( USER_NAME varchar not null primary key, ADDRESS varchar not null) create table BILLING_DETAILS ( ACCOUNT_NUMBER varchar not null primary key, ACCOUNT_NAME varchar not null, ACCOUNT_TYPE varchar not null, USER_NAME varchar foreign key references USER)
The problem of granularity ,[object Object],[object Object],[object Object],[object Object],create table USER ( USER_NAME varchar not null primary key, ADDRESS_STREET varchar not null, ADDRESS_CITY varchar not null, ADDRESS_ZIPCODE varchar not null ) User userName: String billingDetails: Set Address street: String city: String zipcode: String
The problem of subtypes ,[object Object],[object Object],[object Object],1 1..* User BillingDetails CreditCard Cheque
The problem of identity ,[object Object],[object Object],[object Object],[object Object],[object Object]
The problem of associations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The problem of object graph navigation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The cost of the mismatch ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Object/Relational Mapping ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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01 Persistence And Orm

  • 1. Object/Relational Persistence and ORM Persistent data in modern object-oriented applications & efficient data management
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