📅 最后修改于: 2020-11-26 05:15:07 🧑 作者: Mango
OrientDB本机支持多种数据类型。以下是相同的完整表格。
| 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 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 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 Min: 0 Max: 41,000,000 items |
| 14 | Link |
Link to another Record. It’s a common one-to-one relationship Java Types: ORID, 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 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 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 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. |
在接下来的章节中，将讨论如何在OrientDB中使用这些数据类型。