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JPA is not a framework or tool but it defines the set of concepts, which can be implemented by any framework or tool. JPA ORM or object-relational mapping was based originally on Hibernate, it has evolved since then.

JPA is a specification and thus, it does not operate by itself. It needs implementation. The ORM tools such as iBatis, TopLink, and Hibernate implements the JPA specifications.

A JPA implementation is required for interacting with a relational database including DB2, Oracle, MySQL, or SQL Server. The popular JPS implementations include TopLink, Hibernate, Open JPA, EclipseLink, and Data Nucleus. The implementations are ORM tools. The mapping bridges data representation in Java application and relational database.

ObjectDB is a database management system that has in-built support of JPA. By communicating with ObjectDB via JPA, you can keep the application portable. It simplifies and enhances the development process and makes an application much faster.

What are the Reasons to Use JPA?

The reasons to use JPA ar discussed in our JPA assignment help in Australia as follows:

Developer Productivity: It is one of the most preferred benefits of JPA. The main reason is that you need to define the mapping between your domain model and database tables to use it for reading and writing operations. You can get many additional benefits such as primary key generation, different performance optimizations, and concurrency management. If offers an efficient and simple API for implementing the CRUD functions.

Database Indeopendent: SQL is a standard language for interacting with a database, however, each database makes use of a different object. It becomes a major issue when the statements have to run on various databases. It is not so when you use JPA. It offers a database-independent abstraction.

Avoid Unnecessary Queries: he JPA implementation stores all entities, which were used in a single transaction. Because of this, a code snippet requires one SQL update though an entity changes in various methods.

Caching: Caching is a performance tuning feature, which you can get for free when you use JPA. JPA defines two types of caches such as the first-level cache and the second-level cache.

The Entity Relationships

JPA can manage entities regarding each other. Four types of entity relationships are possible in objects and tables. These are stated in our JPA - Java Persistence API assignment help firm as follows:

• One-to-one
• One-to-many
• Many-to-one
• Many-to-many

Each kind of relationship describes how the entity is related to other entities. For instance, a musical entity can have a one-to-many relationship and an entity is represented by a List of a set. JPA consists of annotations for each of the relationship mapping types.

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