Technosoft Java Team has exceptional skills in Hibernate. Technosoft has developed several large & medium scale enterprise applications using Hibernate (3.2). Following is a snapshot of our experience with Hibernate based applications.
Hibernate is a Java based ORM (object-relational mapping) and persistence framework that allows you to map plain old Java objects to relational database tables using XML configuration files. Using Hibernate we were able to save considerable development time on projects, since the whole JDBC layer is managed by the framework. Our application's data access layer will sit above Hibernate and be completely abstracted away from of the underlying data model.
Hibernate maps Database tables to the persistent classes called models. Programmer is provided with data objects (models) instead of tables. The mapping of database table columns to the model fields and their data types are defined in xml files. Technosoft have explored Hibernate features like Basic O/R Mapping, Collection Mapping, Association Mapping, Component Mapping, Inheritance Mapping, Transaction and Concurrency, Optimizing fetching and caching etc.
Relationships between entities must be well reflected by an ORM framework. In the world of the object-oriented approach, relations between objects are represented by associations. So hibernate provides different features of defining associations. Technosoft have used one-one, one-many and many-many associations between persistence classes.
Depending upon the data model design, some applications have parent child relationships among the tables. Hibernate provides its Inheritance feature to deal in such scenarios. Hibernate supports three basic inheritance mapping strategies and we have worked with all these.
Table per class hierarchy
Table per subclass
Table per concrete class
An easy way to get good performance, especially in a high transaction-volume interactive application, is to use connection pooling. By default, Hibernate uses a small internal connection pool. However, Hibernate also comes with a third-party connection pool C3P0 that Technosoft have used successfully in production environments.
In any database application transaction management is always important. The core of transactions in Hibernate is the Transaction interface. This interface is implemented to provide built-in support for communication and transaction management at database/JTA level. There are three implementations of the transaction interface provided by Hibernate and we have tried all of these three.
HQL is the beauty of Hibernate. In itself, SQL is very powerful. So when the power of SQL is combined with the flexibility of the object oriented approach, we get Hibernate Query Language (HQL). Just like SQL, HQL also provides Projection queries, Aggregation functions, Grouping and Restrictions. Even the most complex queries in SQL can be mapped to HQL. Also, HQL has all the attributes of an object-oriented language including polymorphism, inheritance and association. Since it is an object-oriented equivalent of SQL, all of the functions of retrieval are provided out-of-the-box in HQL. Technosoft have extensive HQL experience.
To speed up your development, Hibernate.org offers Hibernate Tools. These tools help the programmers to quickly generate the configuration file and database objects from existing database schema. Hibernate tools can be used to edit the Hibernate configuration file in GUI mode. Features like reverse engineering, POJOs and hibernate mapping file generation, hibernate configuration file generation and custom templates generation have really helped us in saving time and increasing productivity.
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