Java 带注释的休眠字符串主键
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Hibernate String Primary Key with Annotation
提问by sedran
I am trying to create a Privilege class with Annotations whose Primary Key is a String. I will assign them manually while inserting. Therefore no need for hibernate to generate a value for it. I'm trying to do something like that:
我正在尝试使用主键是字符串的注释创建一个权限类。我将在插入时手动分配它们。因此不需要休眠为其生成值。我正在尝试做这样的事情：
@Id
@GeneratedValue(generator = "assigned")
@Column(name = "ROLE_NAME", nullable = false)
private String roleName;
But it throws that exception:
但它抛出该异常：
Caused by: org.hibernate.AnnotationException: Unknown Id.generator: assigned
How can I configure a Stringprimary key with annotations?
如何String使用注释配置主键？
采纳答案by JB Nizet
Since the roleNameis not auto-generated, you should simply not annotate it with @GeneratedValue:
由于roleName不是自动生成的，您不应该简单地使用以下注释对其进行注释@GeneratedValue：
@Id
@Column(name = "ROLE_NAME", nullable = false)
private String roleName;
回答by Pratik Shelar
Just use the @Idannotation which lets you define which property is the identifier of your entity. You don't need to use the @GeneratedValueannotation because I don't think you want hibernate to generate this property for you.
只需使用@Id可让您定义哪个属性是实体标识符的注释。您不需要使用@GeneratedValue注释，因为我认为您不希望 hibernate 为您生成此属性。
Even in the XML configuration based approach its an optional tag and can be skipped.
即使在基于 XML 配置的方法中，它也是一个可选标签，可以跳过。
回答by Gopi
@Id
@Column(name = "USER_ID",unique=true,columnDefinition="VARCHAR(64)")
private String userId;
This worked for me by representing the columnDefinition type with column annotation during the save or update.
通过在保存或更新期间用列注释表示 columnDefinition 类型，这对我有用。
