What is ORM?
ORM stands for Object-Relational Mapping (ORM) is a programming technique for converting data between relational databases and object oriented programming languages such as Java, C# etc. An ORM system has following advantages over plain JDBC
ADVANTAGE
1 Lets business code access objects rather than DB tables.
2 Hides details of SQL queries from OO logic.
3 Based on JDBC 'under the hood'
4 No need to deal with the database implementation.
5 Entities based on business concepts rather than database structure.
6 Transaction management and automatic key generation.
7 Fast development of application.
An ORM solution consists of the following four entities:S.N. Solutions
1 An API to perform basic CRUD operations on objects of persistent classes.
2 A language or API to specify queries that refer to classes and properties of classes.
3 A configurable facility for specifying mapping metadata.
4 A technique to interact with transactional objects to perform dirty checking, lazy association fetching, and other optimization functions.
ADVANTAGE
1 Lets business code access objects rather than DB tables.
2 Hides details of SQL queries from OO logic.
3 Based on JDBC 'under the hood'
4 No need to deal with the database implementation.
5 Entities based on business concepts rather than database structure.
6 Transaction management and automatic key generation.
7 Fast development of application.
An ORM solution consists of the following four entities:S.N. Solutions
1 An API to perform basic CRUD operations on objects of persistent classes.
2 A language or API to specify queries that refer to classes and properties of classes.
3 A configurable facility for specifying mapping metadata.
4 A technique to interact with transactional objects to perform dirty checking, lazy association fetching, and other optimization functions.
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