/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.userguide.mapping.generated;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import org.hibernate.annotations.ValueGenerationType;
import org.hibernate.jpa.test.BaseEntityManagerFunctionalTestCase;
import org.hibernate.tuple.AnnotationValueGeneration;
import org.hibernate.tuple.GenerationTiming;
import org.hibernate.tuple.ValueGenerator;
import org.junit.Test;
import static org.hibernate.testing.transaction.TransactionUtil.doInJPA;
/**
* @author Vlad Mihalcea
*/
public class DatabaseValueGenerationTest extends BaseEntityManagerFunctionalTestCase {
@Override
protected Class<?>[] getAnnotatedClasses() {
return new Class<?>[] {
Event.class
};
}
@Test
public void test() {
doInJPA( this::entityManagerFactory, entityManager -> {
Event dateEvent = new Event( );
entityManager.persist( dateEvent );
} );
}
//tag::mapping-database-generated-value-example[]
@Entity(name = "Event")
public static class Event {
@Id
@GeneratedValue
private Long id;
@Column(name = "`timestamp`")
@FunctionCreationTimestamp
private Date timestamp;
public Event() {}
public Long getId() {
return id;
}
public Date getTimestamp() {
return timestamp;
}
}
@ValueGenerationType(generatedBy = FunctionCreationValueGeneration.class)
@Retention(RetentionPolicy.RUNTIME)
public @interface FunctionCreationTimestamp {}
public static class FunctionCreationValueGeneration
implements AnnotationValueGeneration<FunctionCreationTimestamp> {
@Override
public void initialize(FunctionCreationTimestamp annotation, Class<?> propertyType) {
}
/**
* Generate value on INSERT
* @return when to generate the value
*/
public GenerationTiming getGenerationTiming() {
return GenerationTiming.INSERT;
}
/**
* Returns null because the value is generated by the database.
* @return null
*/
public ValueGenerator<?> getValueGenerator() {
return null;
}
/**
* Returns true because the value is generated by the database.
* @return true
*/
public boolean referenceColumnInSql() {
return true;
}
/**
* Returns the database-generated value
* @return database-generated value
*/
public String getDatabaseGeneratedReferencedColumnValue() {
return "current_timestamp";
}
}
//end::mapping-database-generated-value-example[]
}