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This article mainly explains "what is the role of Hibernate". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the role of Hibernate".

I. hibernate definition

Hibernate is an object-relational mapping solution in Java language. It is a free, open source software. It is used to map the objects represented by the object model to the relational model structure based on SQL, and provides a convenient framework for mapping the object-oriented domain model to the traditional relational database.

II. The role of hibernate

Hibernate not only manages the mapping of Java classes to database tables (including mapping from Java data types to SQL data types), but also provides methods for data query and data acquisition, which can greatly reduce the time spent manually using SQL and JDBC to process data during development.

Its design goal is to liberate software developers from a large number of programming tasks related to the same data persistence layer. Developers can adopt Hibernate, whether it's from a design draft or from a legacy database.

III. Application of hibernate

Hibernate makes a very lightweight object encapsulation of JDBC, so that Java programmers can use object programming thinking to manipulate the database at will. Hibernate can be used in any situation where JDBC is used. It can be used not only in client programs of Java, but also in Web applications of Servlet/JSP. * Revolutionary significance is that Hibernate can replace CMP in the J2EE architecture that applies EJB (Enterprise JavaBeans is the framework of Java applied to enterprise computing) to accomplish the important task of data persistence.

IV. Introduction to Hibernate API, the basis of Hibernate

Interfaces in 1.Hibernate API can be divided into the following categories:

1) provide interfaces for accessing database operations, including session, Transaction, Query interfaces

2) the interface used to configure Hibernate, Configuration

3) indirect interface to make the application accept the events occurring within Hibernate and respond to them, including Interceptor, Lifecycle, Validatable

4) APIs used to extend Hibernate functions, such as UserType, CompositeUserType, IdentifierGenerator interfaces.

JDBC, JTA (Java Transaction API) and JNDI (Java Naming And Directory Interface) are also encapsulated inside Hibernate. Among them, JDBC provides the underlying data access operation, as long as the user provides the corresponding JDBC driver, Hibernate can access any database system. JTA and JNDI enable Hibernate to integrate with J2EE application servers.

The core interface frame of 2.Hibernate

5. Advantages and disadvantages of hibernate foundation-- Hibernate

1. Advantages:

A.Hibernate uses the Java reflection mechanism instead of a bytecode enhancer to achieve transparency.

B.Hibernate performs very well because it is a lightweight framework. The flexibility of mapping is excellent.

c. It supports a variety of relational databases, from one-to-one to many-to-many complex relationships.

two。 Disadvantages:

Hibernate restricts the object model you use. For example, a persistence class cannot be mapped to multiple tables.

Thank you for your reading, the above is the content of "what is the role of Hibernate", after the study of this article, I believe you have a deeper understanding of what the role of Hibernate is, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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