crud_operations.rs

#[macro_use]
extern crate maplit;
use cdrs_tokio::authenticators::StaticPasswordAuthenticatorProvider;
use cdrs_tokio::cluster::session::{Session, SessionBuilder, TcpSessionBuilder};
use cdrs_tokio::cluster::{NodeTcpConfigBuilder, TcpConnectionManager};
use cdrs_tokio::frame::TryFromRow;
use cdrs_tokio::load_balancing::RoundRobinLoadBalancingStrategy;
use cdrs_tokio::query::*;
use cdrs_tokio::query_values;
use cdrs_tokio::transport::TransportTcp;
use cdrs_tokio::{IntoCdrsValue, TryFromRow, TryFromUdt};
use std::collections::HashMap;
use std::sync::Arc;

type CurrentSession = Session<
    TransportTcp,
    TcpConnectionManager,
    RoundRobinLoadBalancingStrategy<TransportTcp, TcpConnectionManager>,
>;

#[tokio::main]
async fn main() {
    let user = "user";
    let password = "password";
    let auth = StaticPasswordAuthenticatorProvider::new(&user, &password);
    let config = NodeTcpConfigBuilder::new()
        .with_contact_point("localhost:9042".into())
        .with_authenticator_provider(Arc::new(auth))
        .build()
        .await
        .unwrap();
    let mut session: CurrentSession =
        TcpSessionBuilder::new(RoundRobinLoadBalancingStrategy::new(), config)
            .build()
            .await
            .unwrap();

    create_keyspace(&mut session).await;
    create_udt(&mut session).await;
    create_table(&mut session).await;
    insert_struct(&mut session).await;
    select_struct(&mut session).await;
    update_struct(&mut session).await;
    delete_struct(&mut session).await;
}

#[derive(Clone, Debug, IntoCdrsValue, TryFromRow, PartialEq)]
struct RowStruct {
    key: i32,
    user: User,
    map: HashMap<String, User>,
    list: Vec<User>,
}

impl RowStruct {
    fn into_query_values(self) -> QueryValues {
        query_values!("key" => self.key, "user" => self.user, "map" => self.map, "list" => self.list)
    }
}

#[derive(Debug, Clone, PartialEq, IntoCdrsValue, TryFromUdt)]
struct User {
    username: String,
}

async fn create_keyspace(session: &mut CurrentSession) {
    let create_ks: &'static str = "CREATE KEYSPACE IF NOT EXISTS test_ks WITH REPLICATION = { \
                                   'class' : 'SimpleStrategy', 'replication_factor' : 1 };";
    session
        .query(create_ks)
        .await
        .expect("Keyspace creation error");
}

async fn create_udt(session: &mut CurrentSession) {
    let create_type_cql = "CREATE TYPE IF NOT EXISTS test_ks.user (username text)";
    session
        .query(create_type_cql)
        .await
        .expect("Keyspace creation error");
}

async fn create_table(session: &mut CurrentSession) {
    let create_table_cql =
    "CREATE TABLE IF NOT EXISTS test_ks.my_test_table (key int PRIMARY KEY, \
     user frozen<test_ks.user>, map map<text, frozen<test_ks.user>>, list list<frozen<test_ks.user>>);";
    session
        .query(create_table_cql)
        .await
        .expect("Table creation error");
}

async fn insert_struct(session: &mut CurrentSession) {
    let row = RowStruct {
        key: 3i32,
        user: User {
            username: "John".to_string(),
        },
        map: hashmap! { "John".to_string() => User { username: "John".to_string() } },
        list: vec![User {
            username: "John".to_string(),
        }],
    };

    let insert_struct_cql = "INSERT INTO test_ks.my_test_table \
                             (key, user, map, list) VALUES (?, ?, ?, ?)";
    session
        .query_with_values(insert_struct_cql, row.into_query_values())
        .await
        .expect("insert");
}

async fn select_struct(session: &mut CurrentSession) {
    let select_struct_cql = "SELECT * FROM test_ks.my_test_table";
    let rows = session
        .query(select_struct_cql)
        .await
        .expect("query")
        .response_body()
        .expect("get body")
        .into_rows()
        .expect("into rows");

    for row in rows {
        let my_row: RowStruct = RowStruct::try_from_row(row).expect("into RowStruct");
        println!("struct got: {my_row:?}");
    }
}

async fn update_struct(session: &mut CurrentSession) {
    let update_struct_cql = "UPDATE test_ks.my_test_table SET user = ? WHERE key = ?";
    let upd_user = User {
        username: "Marry".to_string(),
    };
    let user_key = 1i32;
    session
        .query_with_values(update_struct_cql, query_values!(upd_user, user_key))
        .await
        .expect("update");
}

async fn delete_struct(session: &mut CurrentSession) {
    let delete_struct_cql = "DELETE FROM test_ks.my_test_table WHERE key = ?";
    let user_key = 1i32;
    session
        .query_with_values(delete_struct_cql, query_values!(user_key))
        .await
        .expect("delete");
}