Timeuuid | ScyllaDB Docs

Timeuuid¶

The Timeuuid type is represented as value::CqlTimeuuid.

Also, value::CqlTimeuuid is a wrapper for uuid::Uuid with custom ordering logic which follows Scylla/Cassandra semantics.

use futures::TryStreamExt;
use scylla::frame::value::CqlTimeuuid;

// Insert some timeuuid into the table
let to_insert: CqlTimeuuid = CqlTimeuuid::from_str("8e14e760-7fa8-11eb-bc66-000000000001")?;

session
    .query_unpaged("INSERT INTO keyspace.table (a) VALUES(?)", (to_insert,))
    .await?;

// Read Timeuuid from the table
let mut iter = session.query_iter("SELECT a FROM keyspace.table", &[])
    .await?
    .rows_stream::<(CqlTimeuuid, )>()?;

while let Some((timeuuid,)) = iter.try_next().await? {
    println!("Read a value from row: {}", timeuuid);
}

Creating your own Timeuuid¶

To create your own Timeuuid objects from timestamp-based uuid v1, you need to enable the feature v1 of uuid crate using:

cargo add uuid -F v1

and now you’re gonna be able to use the uuid::v1 features:

use futures::TryStreamExt;
use scylla::frame::value::CqlTimeuuid;
use uuid::Uuid;

// Tip: you can use random stable numbers or your MAC Address
let node_id = [0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC];

// Build your Timeuuid with the current timestamp
let to_insert = CqlTimeuuid::from(Uuid::now_v1(&node_id));

session
    .query_unpaged("INSERT INTO keyspace.table (a) VALUES(?)", (to_insert,))  
    .await?;

// Read Timeuuid from the table
let mut iter = session.query_iter("SELECT a FROM keyspace.table", &[])
    .await?
    .rows_stream::<(CqlTimeuuid, )>()?;

while let Some((timeuuid,)) = iter.try_next().await? {
    println!("Read a value from row: {}", timeuuid);
}

Learn more about UUID::v1 here.

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