Scylla Rust Driver Data Types List, Set, Map

List, Set, Map¶

List¶

List is represented as Vec<T>

use scylla::IntoTypedRows;

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

// Read a list of ints from the table
if let Some(rows) = session.query("SELECT a FROM keyspace.table", &[]).await?.rows {
    for row in rows.into_typed::<(Vec<i32>,)>() {
        let (list_value,): (Vec<i32>,) = row?;
    }
}

Set¶

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

use scylla::IntoTypedRows;

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

// Read a set of ints from the table
if let Some(rows) = session.query("SELECT a FROM keyspace.table", &[]).await?.rows {
    for row in rows.into_typed::<(Vec<i32>,)>() {
        let (set_value,): (Vec<i32>,) = row?;
    }
}

use scylla::IntoTypedRows;
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("INSERT INTO keyspace.table (a) VALUES(?)", (&my_set,))
    .await?;

// Read a set of ints from the table
if let Some(rows) = session.query("SELECT a FROM keyspace.table", &[]).await?.rows {
    for row in rows.into_typed::<(HashSet<i32>,)>() {
        let (set_value,): (HashSet<i32>,) = row?;
    }
}

use scylla::IntoTypedRows;
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("INSERT INTO keyspace.table (a) VALUES(?)", (&my_set,))
    .await?;

// Read a set of ints from the table
if let Some(rows) = session.query("SELECT a FROM keyspace.table", &[]).await?.rows {
    for row in rows.into_typed::<(BTreeSet<i32>,)>() {
        let (set_value,): (BTreeSet<i32>,) = row?;
    }
}

Map¶

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

use scylla::IntoTypedRows;
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("INSERT INTO keyspace.table (a) VALUES(?)", (&my_map,))
    .await?;

// Read a map from the table
if let Some(rows) = session.query("SELECT a FROM keyspace.table", &[]).await?.rows {
    for row in rows.into_typed::<(HashMap<String, i32>,)>() {
        let (map_value,): (HashMap<String, i32>,) = row?;
    }
}

use scylla::IntoTypedRows;
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("INSERT INTO keyspace.table (a) VALUES(?)", (&my_map,))
    .await?;

// Read a map from the table
if let Some(rows) = session.query("SELECT a FROM keyspace.table", &[]).await?.rows {
    for row in rows.into_typed::<(BTreeMap<String, i32>,)>() {
        let (map_value,): (BTreeMap<String, i32>,) = row?;
    }
}