javax.persistence
Annotation Type UniqueConstraint


@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

Required Element Summary
 java.lang.String[] columnNames
          (Required) An array of the column names that make up the constraint.
 
Optional Element Summary
 java.lang.String name
          (Optional) Constraint name.
 

Element Detail

columnNames

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

name

public abstract java.lang.String name
(Optional) Constraint name. A provider-chosen name will be chosen if a name is not specified.

Since:
Java Persistence 2.0
Default:
""


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Generated on 10-February-2011 12:41


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