显示的基础类型

Sometimes you want a particular attribute to be handled differently.Occasionally Hibernate will implicitly pick a BasicType that you do not want (and for some reason you do not want to adjust the BasicTypeRegistry). 有时你想要一个被不同地处理的特定的属性。 偶尔Hibernate会隐式选择一个你不想要的BasicType(并且由于某种原因你不想调整BasicTypeRegistry)。

In these cases you must explicitly tell Hibernate the BasicType to use, via the org.hibernate.annotations.Type annotation. 在这些情况下,您必须通过org.hibernate.annotations.Type注释明确告诉Hibernate使用BasicType类型。

Example 6. Using @org.hibernate.annotations.Type 例6. 使用@org.hibernate.annotations.Type

@Entity(name = "Product")
public class Product {

    @Id
    private Integer id;

    private String sku;

    @org.hibernate.annotations.Type( type = "nstring" )
    private String name;

    @org.hibernate.annotations.Type( type = "materialized_nclob" )
    private String description;
}

This tells Hibernate to store the Strings as nationalized data.This is just for illustration purposes; for better ways to indicate nationalized character data see Mapping Nationalized Character Data section. 这告诉Hibernate将字符串存储为nationalized类型的数据。 这里只是为了说明的目的; 有关nationalized数据的更好方法,请参阅映射nationalized数据部分。

Additionally, the description is to be handled as a LOB. Again, for better ways to indicate LOBs see Mapping LOBs section. 另外,该描述将作为LOB处理。 再次,为了更好的方式指示LOB,请参阅映射LOB部分

The org.hibernate.annotations.Type#type attribute can name any of the following: org.hibernate.annotations.Type的type属性可以通过以下任何一个命名:

  • Fully qualified name of any org.hibernate.type.Type implementation
  • 任何org.hibernate.type.Type实现的完全限定名
  • Any key registered with BasicTypeRegistry
  • 使用BasicTypeRegistry注册的任何键
  • The name of any known type definitions
  • 任何已知类型定义的名称

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