Custom Key Generator In Hibernate

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Every JPA entity is required to have a field which maps to primary key of the database table. Such field must be annotated with @Id.

Simple vs Composite primary keys

A simple primary key Parallels desktop 12 activation key generator free. consists of a single Java field which maps to a single table column.
A composite primary key consists of multiple Java fields which individually map to separate columns.

Supported types for a primary key

A simple primary key field or one of the composite primary key field should be one of the following types:

• Any Java primitive type
• any Any primitive wrapper type
• java.lang.String
• java.util.Date
• java.sql.Date
• java.math.BigDecimal
• java.math.BigInteger

Mar 01, 2016  How to combine the Hibernate assigned generator with a sequence or an identity column. Let’s assume that our current entity takes a positive identifier value when the primary key is assigned by the database, while the negative values are reserved for a batch process that imports data from a legacy system. Do the same with a sequence. How to generate Custom Id using hibernate while it must be primary key of table. And use custom key generator. The best way to implement custom id generator in. In this post we are going to show you, how to create custom generator class in hibernate. In hibernate generator class is used to generate unique identifiers for instances of persistence class. Hibernate provides you the list of default generator classes and of course they all have advantages and disadvantages.

In this tutorial we are going to focus on generation strategies of simple primary key.

@GeneratedValue Annotation

This annotation defines the types of primary key generation strategies. If this annotation is not used then application is responsible to populate and manage @Id field values itself.

The use of the GeneratedValue annotation is only required to be supported for simple primary keys.

GenerationType enum defines four strategies: Generation Type . TABLE, Generation Type. SEQUENCE, Generation Type. IDENTITY and Generation Type. AUTO. Let's understand them with examples.

GenerationType.SEQUENCE

With this strategy, underlying persistence provider must use a database sequence to get the next unique primary key for the entities.

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We have created the following Util class to reuse the code for other examples.

Also, in the persistence.xml, we have created four persistence-unit, so that we can try four GenerationType independently. We are using Hibernate as persistence provider.

Let's create main class to try out Entity1 key generation. Generated key phrases for cyber bullying.

Output

Above output shows one table MYENTITY1 and one sequence HIBERNATE_SEQUENCE are created.

GenerationType.TABLE

With this strategy, underlying persistence provider must use a database table to generate/keep the next unique primary key for the entities.

Output

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This time no sequence is generated, instead an additional table named 'HIBERNATE_SEQUENCES' is created to maintain primary key sequence.

GenerationType.IDENTITY

This GenerationType indicates that the persistence provider must assign primary keys for the entity using a database identity column. IDENTITY column is typically used in SQL Server. This special type column is populated internally by the table itself without using a separate sequence. If underlying database doesn't support IDENTITY column or some similar variant then the persistence provider can choose an alternative appropriate strategy. In this examples we are using H2 database which doesn't support IDENTITY column.

Output

Above output shows that a sequence is used for primary keys.

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GenerationType.AUTO

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This GenerationType indicates that the persistence provider should automatically pick an appropriate strategy for the particular database. This is the default GenerationType, i.e. if we just use @GeneratedValue annotation then this value of GenerationType will be used.

Output

Above output shows that a sequence is used for primary keys.

When @GeneratedValue not used

If we don't use @GeneratedValue annotation at all, then we have to populate the unique primary keys ourselves. In this example, we are simply assigning it to the value returned from System.nanoTime()

Output

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Above output shows that a no sequence or extra table were generated.

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Example Project

Dependencies and Technologies Used:

• h2 1.4.193: H2 Database Engine.
• hibernate-core 5.2.8.Final: The core O/RM functionality as provided by Hibernate.
  Implements javax.persistence:javax.persistence-api version 2.1
• JDK 1.8
• Maven 3.3.9

Custom Key Generator In Hibernate Windows 7