这表示将为名为id的主键属性创建关系。
This indicates that the relationship will be created for a primary key property named: id.
它们为ID属性使用数据库生成的主键值。
They use database-generated primary key values for the ID attribute.
更新一本特定的、由其主键标识的书籍的属性。
Updates the attributes of a specific book that is identified by its primary key.
更新一本特定的、由其主键标识的书籍的属性。
Updates the attributes of a specific book that is identified by its primary key.
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