停止Hibernate创建非空约束 [英] Stop Hibernate from creating not-null constraints

问题描述

当使用 hbm2ddl时，有没有办法阻止Hibernate为使用 @ javax.validation.constraints.NotNull 注释的属性创建非空约束=创建？

解决方案

从Hibernate Validator的文档：

6.1。数据库模式级验证

开箱即用，Hibernate Annotations
（从Hibernate 3.5.x开始）会将
您已经为您的实体定义了
的约束条件来映射元数据。
例如，如果您的
实体的属性注释为 @NotNull ，则其
列将被声明为非空
由
生成的DDL模式Hibernate。

如果由于某种原因，
被禁用，设置
hibernate.validator.apply_to_ddl 为
false 。另请参阅表格2.2，内置
约束。您还可以将DDL约束
generation限制为已定义的子集
限制，方法是设置属性
org.hibernate.validator.group.ddl 。
该属性指定逗号
分隔，完全指定的类名
，约束必须是
的一部分，以便为
DDL模式生成考虑。

有关 org.hibernate.validator.group.ddl 财产，另见 4.1.2。配置。

Is there a way to stop Hibernate from creating not-null constraints for properties annotated with @javax.validation.constraints.NotNull when using hbm2ddl = create?

解决方案

From the documentation of Hibernate Validator:

6.1. Database schema-level validation

Out of the box, Hibernate Annotations (as of Hibernate 3.5.x) will translate the constraints you have defined for your entities into mapping metadata. For example, if a property of your entity is annotated @NotNull, its columns will be declared as not null in the DDL schema generated by Hibernate.

If, for some reason, the feature needs to be disabled, set hibernate.validator.apply_to_ddl to false. See also Table 2.2, "Built-in constraints".

You can also limit the DDL constraint generation to a subset of the defined constraints by setting the property org.hibernate.validator.group.ddl. The property specifies the comma seperated, fully specified classnames of the groups a constraint has to be part of in order to be considered for DDL schema generation.

For more details about the org.hibernate.validator.group.ddl property, see also the section 4.1.2. Configuration.

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