javax.persistence

Annotation Type UniqueConstraint

Contents

  • @Target(value={})
 @Retention(value=RUNTIME)
public @interface UniqueConstraint
    Specifies that a unique constraint is to be included in the generated DDL for a primary or secondary table. 
        Example:
    @Entity
    @Table(
        name="EMPLOYEE", 
        uniqueConstraints=
            @UniqueConstraint(columnNames={"EMP_ID", "EMP_NAME"})
    )
    public class Employee { ... }
    Since:
    Java Persistence 1.0

    • Element Detail

      • columnNames

        public abstract String[] columnNames
        (Required) An array of the column names that make up the constraint.

      • name

        public abstract String name
        (Optional) Constraint name. A provider-chosen name will be chosen if a name is not specified.
        Since:
        Java Persistence 2.0
        Default:
        ""

Document created the 11/06/2005, last modified the 18/08/2025
Source of the printed document:https://www.gaudry.be/en/java-api-javaee-rf-javax/persistence/UniqueConstraint.html

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References

  1. View the html document Language of the document:fr Manuel PHP : https://docs.oracle.com, UniqueConstraint (Java(TM) EE 7 Specification APIs)

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