Was this page helpful?
Caution
You're viewing documentation for an unstable version of Scylla Rust Driver. Switch to the latest stable version.
Counter¶
Counter is represented as struct Counter(pub i64)
Counter can’t be inserted, it can only be read or updated.
use futures::TryStreamExt;
use scylla::value::Counter;
// Add to counter value
let to_add: Counter = Counter(100);
session
.query_unpaged("UPDATE keyspace.table SET c = c + ? WHERE pk = 15", (to_add,))
.await?;
// Read counter from the table
let mut stream = session.query_iter("SELECT c FROM keyspace.table", &[])
.await?
.rows_stream::<(Counter,)>()?;
while let Some((counter_value,)) = stream.try_next().await? {
let counter_int_value: i64 = counter_value.0;
println!("{}", counter_int_value);
}