Module persistence.api
Package javax.persistence

Annotation Type UniqueConstraint

@Target(TYPE) @Retention(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

  • Required Element Summary

    Required Elements
    Modifier and Type
    Required Element
    Description
    String[]
    columnNames
    (Required) An array of the column names that make up the constraint.

  • Optional Element Summary

    Optional Elements
    Modifier and Type
    Optional Element
    Description
    String
    name
    (Optional) Constraint name.

  • Element Details

    • columnNames

      String[] columnNames
      (Required) An array of the column names that make up the constraint.
      Returns:
      col names

    • name

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