What datatypes are supported by Google App Engine's datastore?

Question

I know how to table in google BigTable.I have one doubt regarding this.what are all the datatype supported by google BigTable.

Thanks in advance

Answer 1

Bigtable can store all Object types. Its just a giant key-value dictionary

Answer 2

Quoting the Class and Field Annotations section from Using JPA with App Engine:

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

To define and use Email and PhoneNumber as data types, create entities for them and map them as @OneToOne or make them @Embeddable.

Answer 3

Check here for a list of datatypes supported in GAE using JDO:

http://code.google.com/appengine/docs/java/datastore/dataclasses.html