ScyllaDB Docs Scylla Rust Driver Data Types List, Set, Map

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List, Set, Map¶

List¶

List is represented as Vec<T>

use futures::TryStreamExt;

// Insert a list of ints into the table
let my_list: Vec<i32> = vec![1, 2, 3, 4, 5];
session
    .query_unpaged("INSERT INTO keyspace.table (a) VALUES(?)", (&my_list,))
    .await?;

// Read a list of ints from the table
let mut stream = session.query_iter("SELECT a FROM keyspace.table", &[])
    .await?
    .rows_stream::<(Vec<i32>,)>()?;
while let Some((list_value,)) = stream.try_next().await? {
    println!("{:?}", list_value);
}

Set¶

Set is represented as Vec<T>, HashSet<T> or BTreeSet<T>:

use futures::TryStreamExt;

// Insert a set of ints into the table
let my_set: Vec<i32> = vec![1, 2, 3, 4, 5];
session
    .query_unpaged("INSERT INTO keyspace.table (a) VALUES(?)", (&my_set,))
    .await?;

// Read a set of ints from the table
let mut stream = session.query_iter("SELECT a FROM keyspace.table", &[])
    .await?
    .rows_stream::<(Vec<i32>,)>()?;
while let Some((set_value,)) = stream.try_next().await? {
    println!("{:?}", set_value);
}

use futures::TryStreamExt;
use std::collections::HashSet;

// Insert a set of ints into the table
let my_set: HashSet<i32> = vec![1, 2, 3, 4, 5].into_iter().collect();
session
    .query_unpaged("INSERT INTO keyspace.table (a) VALUES(?)", (&my_set,))
    .await?;

// Read a set of ints from the table
let mut iter = session.query_iter("SELECT a FROM keyspace.table", &[])
    .await?
    .rows_stream::<(HashSet<i32>,)>()?;
while let Some((set_value,)) = iter.try_next().await? {
    println!("{:?}", set_value);
}

use futures::TryStreamExt;
use std::collections::BTreeSet;

// Insert a set of ints into the table
let my_set: BTreeSet<i32> = vec![1, 2, 3, 4, 5].into_iter().collect();
session
    .query_unpaged("INSERT INTO keyspace.table (a) VALUES(?)", (&my_set,))
    .await?;

// Read a set of ints from the table
let mut iter = session.query_iter("SELECT a FROM keyspace.table", &[])
    .await?
    .rows_stream::<(BTreeSet<i32>,)>()?;
while let Some((set_value,)) = iter.try_next().await? {
    println!("{:?}", set_value);
}

Map¶

Map is represented as HashMap<K, V> or BTreeMap<K, V>

use futures::TryStreamExt;
use std::collections::HashMap;

// Insert a map of text and int into the table
let mut my_map: HashMap<String, i32> = HashMap::new();
my_map.insert("abcd".to_string(), 16);

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

// Read a map from the table
let mut iter = session.query_iter("SELECT a FROM keyspace.table", &[])
    .await?
    .rows_stream::<(HashMap<String, i32>,)>()?;
while let Some((map_value,)) = iter.try_next().await? {
    println!("{:?}", map_value);
}

use futures::TryStreamExt;
use std::collections::BTreeMap;

// Insert a map of text and int into the table
let mut my_map: BTreeMap<String, i32> = BTreeMap::new();
my_map.insert("abcd".to_string(), 16);

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

// Read a map from the table
let mut iter = session.query_iter("SELECT a FROM keyspace.table", &[])
    .await?
    .rows_stream::<(BTreeMap<String, i32>,)>()?;
while let Some((map_value,)) = iter.try_next().await? {
    println!("{:?}", map_value);
}

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