英文:
How can I add a custom message for @Column(nullable = false)?
问题
我之前是这样使用 @NotNull 来验证类的字段的：@NotNull(message = "Vendor ID must be fetched from Orders")。然而，我决定用数据库级别的约束替换 @NotNull 验证，使用 @Column(nullable = false)。有没有办法为这个验证添加自定义消息，类似于 @NotNull 版本的验证中的消息，以便在违反约束的情况下得到指定的消息？
英文:
I was previously using @NotNull to validate the fields of a class as follows: @NotNull(message = "Vendor ID must be fetched from Orders"). However, I decided to replace the @NotNull validation with database-level constraints, using @Column(nullable = false). Is there any way to add the custom message to this validation, similar to the one present with the @NotNull version of the validation, such that I get the specified message in case of violation of the constraint?
答案1
得分: 1
因为@Column描述的是数据库属性，所以它无法在您希望的级别上进行验证：如果您使用@Column(nullable = false)，您并没有表示setter参数不能为null，而是表示该列不能为null，因此您将在数据库级别上进行验证并获得一条消息。
英文:
Since @Column describes a db property, it cannot do a validation at the level you want: if you say @Column(nullable = false), you are not saying the setter parameter cannot be null, you are saying that that column cannot be null, so you will have a validation and a message at the database level.
答案2
得分: 1
实际上，@Column(nullable = false) 和 @NotNull 是完全独立的事物。
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只有在使用 Hibernate 模式生成 时，
@Column(nullable = false)才有意义。违反此约束将导致数据库级错误，并附带特定于数据库的错误消息。 -
@NotNull是 bean 验证 的一部分。违反此约束将导致应用程序级错误，可以进行自定义设置。
英文:
Actually, the @Column(nullable = false) and @NotNull are completely independent things.
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The
@Column(nullable = false)make sense only if you use hibernate schema generation. And violation of this constraint will lead to the db level error with db specific error message. -
The
@NotNullis a part of bean validation. And violation of this constraint will lead to the application level error that can be customized.
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