Uuid - uuidv7

uuidv7 and uuidv4 tools: shellscript, Go, Javascript, Postgresql, C

This is collection to use uuidV7.

UuidV7 and other uuid-based ones include, for example, the fact that the prefix is a timestamp, which makes indexing enjoyable and the timestamp does not need to be separately stored. It can be used for sorting just like SERIAL type keys.

• IETF
• Why uuidv7 is better ...
• Good bye integers, welcome uuids
• Kvelakur C-language version using SSL Rand -uuidv4

Ksh / Bash shellscript uuidv7

• My ksh shellscript to generate uuidV7

Bash / Ksh uuidv4

# using cmd uuidgen
uuidgen

# using kernel file
read uuid < /proc/sys/kernel/random/uuid
#uuid=$(cat /proc/sys/kernel/random/uuid)
echo $uuid

# using OpenSSL rand
uuid=$(openssl rand -hex 16)
echo ${uuid:0:8}-${uuid:8:4}-4${uuid:12:3}-${uuid:16:4}-${uuid:20:12}

Postgresql uuidv7

• My Postgresql function to generate uuidV7

SqliLite uuidv7

• SQLLite

Go uuidv7

• My version to generate uuidv7
• Standalone server to return uuidv7

Javascript uuidv7

Based on the JS versions published by Fabio Lim. Uuidv4 and uuidv7 are really elegant solutions. Quite easily adaptable to other languages as well.

• My html test page

const v4 = () => {
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
    const r = Math.trunc(Math.random() * 16);
    const v = c == 'x' ? r : (r & 0x3 | 0x8);
    return v.toString(16);
  });
}

const v7 = () => {
  return 'tttttttt-tttt-7xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
    const r = Math.trunc(Math.random() * 16);
    const v = c == 'x' ? r : (r & 0x3 | 0x8);
    return v.toString(16);
  }).replace(/^[t]{8}-[t]{4}/, function() {
    const unixtimestamp = Date.now().toString(16).padStart(12, '0');
    return unixtimestamp.slice(0, 8) + '-' + unixtimestamp.slice(8);
  });
}

console.log(v4());
console.log(v7());

Look file uuid.js and uuidv7.js more uuid versions. Source Fabio Lim.