项目更多介绍参照:https://github.com/yitter/idgenerator
代码贡献者:zhupengfei(在 bubao 布宝 的JS基础上改版,感谢bubao 布宝)
js Number 类型最大数值:9007199254740992(16位),
在JS中没有bigint类型,所以建议将ID控制在16位以内,统一使用number类型
import { snowflakeIdv1 } from '../snowflakeIdv1'
const WorkerId = process.env.WorkerId == undefined ? 1 : process.env.WorkerId
let gen1 = new snowflakeIdv1({ WorkerId: WorkerId})
let id1 = gen1.NextId()
console.log(id1, id1.toString().length)
npm i simple-flakeid
const snowId = require('simple-flakeid')
let gen1 = new snowId.SnowflakeIdv1({ workerId: 1 })
for (let i = 0; i < 10; i++) {
let id1 = gen1.NextId()
console.log(`${i} ID:${id1} ${typeof id1} length:${id1.toString().length}`)
}
根据输出数值判断,小于number最大值时输出number类型,大于时输出bigint
始终输出number类型,超过时throw error
始终输出bigint类型
ts-node test/test1.ts
import { snowflakeIdv1 } from '../snowflakeIdv1'
const WorkerId = process.env.WorkerId == undefined ? 1 : process.env.WorkerId
let gen1 = new snowflakeIdv1({ WorkerId: WorkerId})
let id1 = gen1.NextId()
console.log(id1, id1.toString().length)
import { snowflakeIdv1 } from '../snowflakeIdv1'
const WorkerId = process.env.WorkerId == undefined ? 1 : process.env.WorkerId
let gen1 = new snowflakeIdv1({ WorkerId: WorkerId, SeqBitLength: 6 })
for (let i = 0; i < 10; i++) {
let id1 = gen1.NextId()
console.log(`${i} ID:${id1} 长度:${id1.toString().length}`)
}
$ ts-node test/test4.ts
0 ID:234712552579141 长度:15
1 ID:234712552587333 长度:15
2 ID:234712552587334 长度:15
3 ID:234712552587335 长度:15
4 ID:234712552587336 长度:15
5 ID:234712552591429 长度:15
6 ID:234712552591430 长度:15
7 ID:234712552591431 长度:15
8 ID:234712552591432 长度:15
9 ID:234712552591433 长度:15
import { snowflakeIdv1 } from '../snowflakeIdv1'
const WorkerId = process.env.WorkerId == undefined ? 1 : process.env.WorkerId
let gen1 = new snowflakeIdv1({ WorkerId: WorkerId, SeqBitLength: 11 })
for (let i = 0; i < 10; i++) {
let id1 = gen1.NextId()
console.log(`${i} ID:${id1} ${typeof id1} 长度:${id1.toString().length}`)
}
$ ts-node test/test4.ts
0 ID:7510958933018629 number 长度:16
1 ID:7510958933280773 number 长度:16
2 ID:7510958933280774 number 长度:16
3 ID:7510958933280775 number 长度:16
4 ID:7510958933411845 number 长度:16
5 ID:7510958933411846 number 长度:16
6 ID:7510958933542917 number 长度:16
7 ID:7510958933542918 number 长度:16
8 ID:7510958933542919 number 长度:16
9 ID:7510958933673989 number 长度:16
import { snowflakeIdv1 } from '../snowflakeIdv1'
const WorkerId = process.env.WorkerId == undefined ? 1 : process.env.WorkerId
let gen1 = new snowflakeIdv1({ WorkerId: WorkerId, SeqBitLength: 12 })
for (let i = 0; i < 10; i++) {
let id1 = gen1.NextId()
console.log(`${i} ID:${id1} ${typeof id1} 长度:${id1.toString().length}`)
}
$ ts-node test/test4.ts
0 ID:15021931987734533 bigint 长度:17
1 ID:15021931987996677 bigint 长度:17
2 ID:15021931987996678 bigint 长度:17
3 ID:15021931987996679 bigint 长度:17
4 ID:15021931987996680 bigint 长度:17
5 ID:15021931988258821 bigint 长度:17
6 ID:15021931988258822 bigint 长度:17
7 ID:15021931988258823 bigint 长度:17
8 ID:15021931988258824 bigint 长度:17
9 ID:15021931988520965 bigint 长度:17
import { snowflakeIdv1 } from '../snowflakeIdv1'
const WorkerId = process.env.WorkerId == undefined ? 1 : process.env.WorkerId
let gen1 = new snowflakeIdv1({ WorkerId: WorkerId, SeqBitLength: 13 })
for (let i = 0; i < 10; i++) {
let id1 = gen1.NextId()
console.log(`${i} ID:${id1} ${typeof id1} 长度:${id1.toString().length}`)
}
$ ts-node test/test4.ts
0 ID:30043877337997317 bigint 长度:17
1 ID:30043877338521605 bigint 长度:17
2 ID:30043877338521606 bigint 长度:17
3 ID:30043877339045893 bigint 长度:17
4 ID:30043877339045894 bigint 长度:17
5 ID:30043877339045895 bigint 长度:17
6 ID:30043877339045896 bigint 长度:17
7 ID:30043877339570181 bigint 长度:17
8 ID:30043877339570182 bigint 长度:17
9 ID:30043877339570183 bigint 长度:17
在mysql中int类型最大长度是10位数字,由于本算法默认生成的是15位,最短也是11位,所以在mysql中需要使用bigint数据类型