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ScyllaDB Docs Scylla Rust Driver Data Types Timeuuid

Caution

You're viewing documentation for an unstable version of Scylla Rust Driver. Switch to the latest stable version.

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::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::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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  • Timeuuid
    • Creating your own Timeuuid
Scylla Rust Driver
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