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The slug attribute is the business key for our Post entity. As I explained previously, we use a surrogate key as well because it’s much more compact and it puts less pressure on memory for both table and index pages. The id property, being the entity identifier, can be marked with the JPA @Id annotation, but for the slug attribute, we need a Hibernate-specific annotation: @NaturalId. 2011-4-6  We recommend all new projects to use hibernate.id.newgeneratormappings=true as the new generators are more efficient and closer to the JPA 2 specification semantic. However they are not backward compatible with existing databases (if a sequence or a table is used for id generation). Arguably more natural. Generate public certificate from private key certificate sap nwa. We map a real one-to-one.

1. Hibernate Java
2. Spring Orm

This Hibernate tutorial demonstrates how to use JPA annotations in order to implement a unidirectional one-to-one association on a foreign key. This is similar to the tutorial Hibernate One-to-One With Foreign Key XML Mapping Example but using annotations instead of XML descriptor. The following diagram recalls the one-to-one entity relationship:A book belongs to only one author, and we can only know the author from the book, not vice-versa. Thus the association is called unidirectional (one-way).We are going to develop a sample Hibernate application using the following technologies/software programs:Note that we use the latest stuffs to date, you can use little bit lower or higher versions. Now, let’s following the steps below:Table of content:

1. Creating Database and Tables

Execute the following MySQL script to create the database booksdb with two tables author and book: The database structure looks like this:

2. Creating Eclipse Project

Create a Maven project in Eclipse with the following structure:The project consists of the following files:

• Model classes: Author.java and Book.java
• Hibernate XML configuration file: hibernate.cfg.xml
• Test program: BooksManager.java
• Maven project: pom.xml

Here’s content of the pom.xml file:Here, we specify two main dependencies: hibernate-core and

Hibernate Java

mysql-connector-java. Maven will resolve other related dependencies automatically.

3. Coding Model Classes with Annotations

The followings are code of the two model classes: Author.java and Book.java.File netcodejavahibernateAuthor.java:File netcodejavahibernateBook.java: As you notice, we use the following JPA annotations:

• @Entity: is required for every model class.
• @Table: maps the class with the corresponding database table. If omitted, Hibernate will use the class name.
• @Column: maps the field with the corresponding table column. If omitted, Hibernate will infer the column name and type based on signatures of the getter/setter.
• @Id and @GeneratedValue: are used in conjunction for a field that maps to the primary key. The values for this field are auto generated.
• @Temporal: must be used with a java.util.Date field to specify the actual SQL type of the column.
• @OneToOne and @JoinColumn: are used together to specify a one-to-one association and the join column.

Using annotations is usually preferred over XML descriptor because it’s simple and straightforward in the code.

4. Writing Hibernate Configuration File

Write XML configuration for database settings and mapping classes in the

Spring Orm

hibernate.cfg.xml file as follows:

5. Writing a Test Program

Write code for the test program (BooksManager.java) as follows:Output of the program:Result in the Book table:Result in the Author table:Related Hibernate One-to-One Tutorials:

Other Hibernate Tutorials:

Attachments:

[Eclipse-Maven project]

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