关注点重复javax.validation.constraints和javax.persistence.Column

Question

I would like to do some Bean validation of my entities so I can appropriately map the errors to send back to the client.

I understand that the javax.validation.constraints annotations are used to achieve this. My issue is that for my schema generation I need to use the javax.persistence.Column annotation, to describe rules for the persistence layer. This seems like I am duplicating my logic a little bit.

    @Size( max= Entities.SCHEMA_DESCRIPTION_LENGTH)
    @NotNull
    @Column(name = "Description", length = Entities.SCHEMA_DESCRIPTION_LENGTH)
    private String description;

As you can see I have to specify that the column is 'Not Nullable for both validation purposes and schema generation purposes (same for column length). This seems redundant. Surely there is a way to kill two birds with one stone in this case, as it seems like it would be pretty common, if not standard.

Thanks

Answer 1

不幸的是，尽管验证和模式生成有时可能会重叠（例如，列长度和可空性），但是它们之间没有交互，因此您必须分别声明这两个问题（并重复自己）。