https://github.com/andreystepanov/hashids.sql

PL/pgSQL implementation of hashids library
https://github.com/andreystepanov/hashids.sql

aws aws-rds aws-rds-postgres hashids id plpgsql postgresql rds shortid sql

Last synced: about 1 month ago
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PL/pgSQL implementation of hashids library

• Host: GitHub
• URL: https://github.com/andreystepanov/hashids.sql
• Owner: andreystepanov
• License: mit
• Created: 2018-10-24T14:02:36.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2022-10-04T17:49:58.000Z (about 2 years ago)
• Last Synced: 2024-09-28T18:23:10.781Z (about 1 month ago)
• Topics: aws, aws-rds, aws-rds-postgres, hashids, id, plpgsql, postgresql, rds, shortid, sql
• Language: PLpgSQL
• Homepage: https://hashids.org/
• Size: 7.81 KB
• Stars: 49
• Watchers: 2
• Forks: 10
• Open Issues: 4
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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• jimsghstars - andreystepanov/hashids.sql - PL/pgSQL implementation of hashids library (PLpgSQL)

README

        
# PL/pgSQL implementation of [Hashids](https://hashids.org/)

Hashids is a small open-source library that generates short, unique, non-sequential ids from numbers.

It converts numbers like 347 into strings like “yr8”. You can also decode those ids back. This is useful in bundling several parameters into one or simply using them as short UIDs.

You can use hashids to hide primary keys in your database.

More information about hashids and it's implementations can be found here: [hashids.org](http://hashids.org)

**Suitable for hosted environments like AWS RDS**.

*But if you are looking for an PG extention, then please check out [pg_hashids](https://github.com/iCyberon/pg_hashids) repository.*

# Usage

#### Encoding

Returns a hash using the default `alphabet` and specified `min_length` and `salt` parameters.

```sql

select hashids.encode( number := 999, min_length := 6, salt := 'salt'); -- dkrMl8

```

`number` parameter can also be an array of numbers:

```sql

select hashids.encode( number := array[111,222], min_length := 6, salt := 'salt'); -- VyAHPK

```

It's also could be helpful to use it with [sequences](https://www.postgresql.org/docs/current/static/sql-createsequence.html):

```sql

select hashids.encode( number := nextval('schema.sequence_name'), min_length := 6, salt := 'salt');

```

  

You can also decode previously generated hashes. Just use the same parameters `salt`, `min_length` and `alphabet`, otherwise you'll get wrong results.

  

```sql

select hashids.decode( id := 'dkrMl8', min_length := 6, salt := 'salt'); -- {999}

select hashids.decode( id := 'VyAHPK', min_length := 6, salt := 'salt'); -- {111,222}

```

Using custom `alphabet`, only capitalized letters and numbers:

	

```sql

select hashids.encode( number := 999, salt := 'salt', alphabet := 'ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890'); -- D3Q5

```

  

#### Encode hex instead of numbers

Useful if you want to encode [Mongo](https://www.mongodb.com/)'s ObjectIds. Note that there is no limit on how large of a hex number you can pass (it does not have to be Mongo's ObjectId).

```sql

select hashids.encode_hex( hex := '507f1f77bcf86cd799439011', salt := 'salt'); -- zro2yr9M4ZCzZ9zd9xYv

```

	

These ids can be also easily decoded back to their original values:

```sql

select hashids.decode_hex( id := 'zro2yr9M4ZCzZ9zd9xYv', salt := 'salt'); -- 507f1f77bcf86cd799439011

```