Orientdb 简明教程

Sr. No.

Type

Description

1

Boolean

Handles only the values True or False. Java types: java.lang.Boolean Min: 0 Max: 1

2

Integer

32-bit signed integers. Java types: java.lang.Interger Min: -2,147,483,648 Max: +2,147,483,647

3

Short

Small 16-bit signed integers. Java types: java.lang.short Min: -32,768 Max: 32,767

4

Long

Big 64-bit signed integers. Java types: java.lang.Long Min: -263 Max: +263-1

5

Float

Decimal numbers. Java types: java.lang.Float Min: 2-149 Max: (2-2-23)*2,127

6

Double

Decimal numbers with high precision. Java types: Java.lang.Double. Min: 2-1074 Max: (2-2-52)*21023

7

Date-time

Any date with the precision up to milliseconds. Java types: java.util.Date

8

String

Any string as alphanumeric sequence of chars. Java types: java.lang.String

9

Binary

Can contain any value as byte array. Java types: byte[ ] Min: 0 Max: 2,147,483,647

10

Embedded

The record is contained inside the owner. The contained record has no RecordId. Java types: ORecord

11

Embedded list

The records are contained inside the owner. The contained records have no RecordIds and are reachable only by navigating the owner record. Java types: List<objects> Min: 0 Max: 41,000,000 items

12

Embedded set

The records are contained inside the owner. The contained records have no RecordId and are reachable only by navigating the owner record. Java types: set<objects> Min: 0 Max: 41,000,000 items

13

Embedded map

The records are contained inside the owner as values of the entries, while the keys can only be strings. The contained records have no RecordId and are reachable only by navigating the owner Record. Java types: Map<String, ORecord> Min: 0 Max: 41,000,000 items

14

Link

Link to another Record. It’s a common one-to-one relationship Java Types: ORID, <? extends ORecord> Min: 1 Max: 32767:2^63-1

15

Link list

Links to other Records. It’s a common one-to-many relationship where only the RecordIds are stored. Java types: List<? Extends ORecord> Min: 0 Max: 41,000,000 items

16

Link set

Links to other records. It’s a common one-to-many relationship. Java types: Set<? extends ORecord> Min: 0 Max: 41,000,000 items

17

Link map

Links to other records as value of the entries, while keys can only be strings. It’s a common one-to-many relationship. Only the RecordIds are stored. Java types: Map<String, ? extends Record> Min: 0 Max: 41,000,000 items

18

Byte

Single byte. Useful to store small 8-bit signed integers. Java types: java.lang.Byte Min: -128 Max: +127

19

Transient

Any value not stored on database.

20

Date

Any date as year, month and day. Java Types: java.util.Date

21

Custom

Used to store a custom type providing the Marshall and Unmarshall methods. Java types: OSerializableStream Min: 0 Max: x

22

Decimal

Decimal numbers without rounding. Java types: java.math.BigDecimal

23

LinkBag

List of RecordIds as specific RidBag. Java types: ORidBag

24

Any

Not determinate type, used to specify collections of mixed type, and null.