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Hibernate / Hibernate Interview Questions III

Explain Formula annotation in Hibernate.

@Formula annotation is used to calculate a given entity attribute using an SQL query expression. It defines a formula (derived value) which is a SQL fragment that acts as a @Column alternative in most cases. It represents read-only state.

public class Area implements Serializable {
	private static final long serialVersionUID = 1L;

	private int id;
	private int length;
	private int width;
	@Formula(" length * width ")
	public long area;

In the example, area property value is calculated using the length and the width properties.

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