📅 最后修改于: 2020-11-22 09:02:32 🧑 作者: Mango
Cassandra支持不同类型的数据类型。让我们在下表中查看不同的数据类型：
| CQL Type | Constants | Description |
|---|---|---|
| ascii | Strings | US-ascii character string |
| bigint | Integers | 64-bit signed long |
| blob | blobs | Arbitrary bytes in hexadecimal |
| boolean | Booleans | True or False |
| counter | Integers | Distributed counter values 64 bit |
| decimal | Integers, Floats | Variable precision decimal |
| double | Integers, Floats | 64-bit floating point |
| float | Integers, Floats | 32-bit floating point |
| frozen | Tuples, collections, user defined types | stores cassandra types |
| inet | Strings | IP address in ipv4 or ipv6 format |
| int | Integers | 32 bit signed integer |
| list | Collection of elements | |
| map | JSON style collection of elements | |
| set | Collection of elements | |
| text | strings | UTF-8 encoded strings |
| timestamp | Integers, Strings | ID generated with date plus time |
| timeuuid | uuids | Type 1 uuid |
| tuple | A group of 2,3 fields | |
| uuid | uuids | Standard uuid |
| varchar | strings | UTF-8 encoded string |
| varint | Integers | Arbitrary precision integer |
Cassandra提供了可以使数据自动过期的功能。
在数据插入期间，您必须以秒为单位指定“ ttl”值。 “ ttl”值是数据的生存时间值。经过特定时间后，数据将被自动删除。