UniqueConstraint (Java EE 5)

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SUMMARY: REQUIRED | OPTIONAL

DETAIL: ELEMENT

javax.persistence Annotation Type UniqueConstraint

@Target(value={}) @Retention(value=RUNTIME) public @interface UniqueConstraint

Implements: Annotation

@Target(value={})
@Retention(value=RUNTIME)

此注释用于指定为主表格或从属表格生成的 DDL 中要包含唯一约束。

    示例：
    @Entity
    @Table(
        name="EMPLOYEE", 
        uniqueConstraints=
            @UniqueConstraint(columnNames={"EMP_ID", "EMP_NAME"})
    )
    public class Employee { ... }

since

Java Persistence 1.0

英文文档：

This annotation is used to specify 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 { ... }