Using the App Engine Datastore - Beginning Java Google App Engine - page 141

Table 7-1. The Datastore Core Value Types

Type Java Class Notes

short text
string, < 500
bytes

java.lang.String

short byte
string, < 500
bytes

com.google.appengine.api.datastore.ShortBlob ShortBlob contains

an array of bytes of a
configurable length.

Boolean
value

boolean or java.lang.Boolean

integer Stored as a long

integer, and then
converted to the
field type.

short , java.lang.Short , int , java.lang.Integer , long ,
java.lang.Long

floating
point
number

Stored as a double-
width float, and then
converted to the field
type.

float , java.lang.Float , double , java.lang.Double

date-time java.util.Date

Google
account

com.google.appengine.api.users.User User represents a

specific user,
represented by the
combination of an
e-mail address and a
specific Google
Apps domain.

long text
string

com.google.appengine.api.datastore.Text String of unlimited

size.

long byte
string

com.google.appengine.api.datastore.Blob Blob contains an

array of bytes of
unlimited size.