java - 验证实体而不保存它

Question

我有实体

@Entity
public class MyEntity {
    @Column(name = "field", nullable = false, length = 10)
    private String field;
}

如何在不保存的情况下验证 field 不再是 10 个字符？

Answer 1

使用bean validation :

@Entity
public class MyEntity {

    @Size(max = 10)
    @Column(name = "field", nullable = false, length = 10)
    private String field;
}

或者也可以使用 hibernate 特定的注释@Length(max = 10)。

然后，您可以使用 validator 验证实体对象:

public class DemoApplication {

    public static void main(String[] args) {

        ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
        Validator validator = factory.getValidator();

        MyEntity myEntity = new MyEntity();
        Set<ConstraintViolation<MyEntity>> constraintViolations = validator.validate(myEntity));
    }
}