Question

Differences between HQL and SQL

Asked by: gudii9

Hi,

I would like to main differences between HQL, SQL. Also I would like to learn best links, resources, concepts on HQL. Please advise. Thanks in advance

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Asked On
2009-06-22 at 14:20:46ID24512684
Topics

J2EE Frameworks

,

J2EE

,

Java Programming Language

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: mrjoltcolaPosted on 2009-06-22 at 14:29:16ID: 24686722

SQL is a semi-standard for all relational database engines. It is Structured Query Language and the database engine understands it.    http://en.wikipedia.org/wiki/SQL

HQL is Hibernate Query Language - It is NOT a standard like SQL, but it is very ubiquitous in its own regard due to the popularity of Hibernate. Hibernate itself is an Object Relational Mapper, intended to map and glue Object Domains (Java, C++) to Relational Domains (SQL Server, Oracle). HQL is implemented inside Hibernate, and is translated to SQL for the target database. In the end, use of HQL will result in SQL to the database.

The key is, to use HQL you need the Hibernate engine.

HQL is "entity" and OOP aware, it is aware of inheritance, etc.

Rather than provide links I will just advise to google: HQL or SQL vs HQL

 

by: phuocnhPosted on 2009-06-22 at 18:26:08ID: 24688169

SQL is a language used in relational database.
OQL is a language used in object database.
Hibernate is an OR mapping. If you use OOP with relational database, Hibernate will help you.
You just pay attention to your object model, dont pay attention to how data is stored into database.
HQL is one implementation of OQL for Hibernate but object database.
SQL works on table, HQL work on object.
SQL works on relation between 2 tables.
HQL works on relation between 2 objects.

 

by: phuocnhPosted on 2009-06-22 at 18:26:56ID: 24688172

 

by: gudii9Posted on 2009-06-25 at 16:56:24ID: 31595275

Thank you very much for your help

20120131-EE-VQP-002

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