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Java Hibernate

Java Hibernate Development Outsourcing

Technosoft Java Team has very high skills in Hibernate. Technosoft has developed many large and medium scale applications using Hibernate (3.2). Following is a picture of our experience with applications developed using Hibernate.

Motivation

Hibernate is a Java-based ORM (object-relational mapping) structure that allows you to change plain old Java objects to interlinked database tables using XML setup files. Using Hibernate we were able to save huge 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 the underlying data model.

Hibernate Core

Hibernate converts Database tables to the models. The programmer is provided with data objects instead of tables. The conversion of database table columns to the model fields and their data types are defined in XML files. Technosoft has explored Hibernate features like Basic O/R Mapping, Collection Mapping, Association Mapping, Component Mapping, Inheritance Mapping, Transaction, and Concurrency, Optimizing fetching and caching etc.

Hibernate Associations

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 has used one-one, one-many and also many-many associations between persistence classes.

Hibernate Inheritance

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. Following are the three basic inheritance mapping strategies that Hibernate supports and we have worked with all these.

1.  Table per class hierarchy

2.  Table per subclass

3.  Table per concrete class

Third Party Connection Pooler

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 has used successfully in production environments.

Transaction Management

In any database application, transaction management is indeed important. The core of transactions in Hibernate is the Transaction interface. This interface is implemented to provide built-in support for communication transaction management at database/JTA level. Following are three implementations of the transaction interface provided by Hibernate and we have tried all of these three.

1.   JDBCTransaction
2.  JTATransaction
3.  CMTTransaction

HQL Experience

HQL is the beauty of Hibernate. In itself, SQL is very powerful. We get Hibernate Query Language (HQL) on combining the power of SQL with the flexibility of the object-oriented approach. Just like SQL, HQL also provides Projection queries, Aggregation functions, Grouping, and Restrictions. Even, we can change the most complex queries in SQL to HQL. Also, HQL has all the attributes of an object-oriented language including polymorphism, inheritance, and association. All of the functions of retrieval are provided out-of-the-box in HQL. Technosoft has high HQL experience.

Hibernate Tool

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 the existing database schema. To edit the Hibernate configuration file in GUI mode, hibernate tools can be used. 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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