java - Google App Engine 数据存储区支持哪些数据类型？

Question

我知道如何在 google BigTable 中制作表格。对此我有一个疑问。google BigTable 支持哪些数据类型。

Answer 1

引用Class and Field Annotations来自 Using JPA with App Engine 的部分:

Fields of the data class that are to be stored in the datastore must either be of a type that is persisted by default or expliclty declared as persistent. You can find a chart detailing JPA default persistence behavior on the DataNucleus website. To explicitly declare a field as persistent, you give it an @Basic annotation:

import java.util.Date;
import javax.persistence.Enumerated;

import com.google.appengine.api.datastore.ShortBlob;

// ...
    @Basic
    private ShortBlob data;

The type of a field can be any of the following:

• one of the core types supported by the datastore
• a Collection (such as a java.util.List<...>) of values of a core datastore type
• an instance or Collection of instances of a @Entity class
• an embedded class, stored as properties on the entity

定义和使用Email和 PhoneNumber作为数据类型，为它们创建实体并将它们映射为 @OneToOne 或制作它们 @Embeddable .