Package jakarta.persistence

Annotation Interface UniqueConstraint

@Target({}) @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:
1.0

  • Required Element Summary

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

  • Optional Element Summary

    Optional Elements
    Modifier and Type
    Optional Element
    Description
    String
    name
    (Optional) The name of the constraint.
    String
    options
    (Optional) A SQL fragment appended to the generated DDL which creates this constraint.

  • Element Details

    • name

      String name
      (Optional) The name of the constraint.

      Defaults to a provider-generated name.

      Since:
      2.0
      Default:
      ""

    • columnNames

      String[] columnNames
      (Required) The names of the column which make up the constraint.

    • options

      String options
      (Optional) A SQL fragment appended to the generated DDL which creates this constraint.
      Since:
      3.2
      Default:
      ""