Package javax.jdo.annotations
Annotation Type Unique
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@Target({TYPE,FIELD,METHOD}) @Retention(RUNTIME) public @interface Unique
Annotation for a database unique constraint. Used for database schema generation to create unique constraints. Also used to reorder database operations when flushing changes to avoid unique constraint violations. Corresponds to the xml element "unique".- Since:
- 2.1
- Version:
- 2.1
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Optional Element Summary
Optional Elements Modifier and Type Optional Element Description Column[]
columns
Columns that compose this unique constraint.java.lang.String
deferred
Whether this unique constraint is deferred until commit.java.lang.String[]
members
Member (field and property) names that compose this unique constraint.java.lang.String
name
Name of the unique constraint.java.lang.String
table
Table for the unique constraint.
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columns
Column[] columns
Columns that compose this unique constraint.- Returns:
- columns that compose this unique constraint
- Default:
- {}
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