Project: YugabyteDB (App Definition and Development / Database)
File: cloud-ysql-rust.md

title: Build a Rust application that uses YSQL headerTitle: Build a Rust application description: Build a small Rust application using the Rust-Postgres driver and using the YSQL API to connect to and interact with a YugabyteDB Managed cluster. headContent: "Client driver: Rust-Postgres" menu: v2.18: parent: build-apps name: Rust identifier: cloud-rust weight: 800 type: docs The following tutorial shows a small that connects to a YugabyteDB cluster using the and performs basic SQL operations. Use the application as a template to get started with YugabyteDB Managed in Rust. development environment. The sample application was created for Rust 1.58 but should work for earlier and later versions. Clone the sample application to your computer: ```sh git clone https://github.com/YugabyteDB-Samples/yugabyte-simple-rust-app.git && cd yugabyte-simple-rust-app ``` If your cluster is running on YugabyteDB Managed, you need to modify the connection parameters so that the application can establish a connection to the YugabyteDB cluster. (You can skip this step if your cluster is running locally and listening on 127.0.0.1:5433.) To do this: Open the `sample-app.rs` file in the `src` directory. Set the following configuration-related constants: HOST - the host name of your YugabyteDB cluster. For local clusters, use the default (127.0.0.1). For YugabyteDB Managed, select your cluster on the Clusters page, and click Settings. The host is displayed under Connection Parameters. PORT - the port number for the driver to use (the default YugabyteDB YSQL port is 5433). DB_NAME - the name of the database you are connecting to (the default is `yugabyte`). USER and PASSWORD - the username and password for the YugabyteDB database. For local clusters, use the defaults (`yugabyte` and `yugabyte`). For YugabyteDB Managed, use the credentials in the credentials file you downloaded. SSL_MODE - the SSL mode to use. YugabyteDB Managed ; use `SslMode::Require`. SSL_ROOT_CERT - the full path to the YugabyteDB Managed cluster CA certificate. Save the file. Build and run the

```sh $ cargo run ``` The driver is included in the dependencies list of the `Cargo.toml` file and installed automatically the first time you run the application. You should see output similar to the following: ```output >>> Successfully connected to YugabyteDB! >>> Successfully created table DemoAccount. >>> Selecting accounts: name = Jessica, age = 28, country = USA, balance = 10000 name = John, age = 28, country = Canada, balance = 9000 >>> Transferred 800 between accounts. >>> Selecting accounts: name = Jessica, age = 28, country = USA, balance = 9200 name = John, age = 28, country = Canada, balance = 9800 ``` You have successfully executed a basic Rust application that works with YugabyteDB Managed. Open the `sample-app.rs` file in the `yugabyte-simple-rust-app/src` folder to review the methods. The `connect` method establishes a connection with your cluster via the Rust-Postgres driver. ```rust let mut cfg = Config::new(); cfg.host(HOST).port(PORT).dbname(DB_NAME). user(USER).password(PASSWORD).sslmode(SSLMODE); let mut builder = SslConnector::builder(SslMethod::tls())?; builder.setcafile(SSLROOTCERT)?; let connector = MakeTlsConnector::new(builder.build()); let client = cfg.connect(connector)?; ``` The `create_database` method uses PostgreSQL-compliant DDL commands to create a sample database. ```rust client.execute("DROP TABLE IF EXISTS DemoAccount", &[])?; client.execute("CREATE TABLE DemoAccount ( id int PRIMARY KEY, name varchar, age int, country varchar, balance int)", &[])?; client.execute("INSERT INTO DemoAccount VALUES (1, 'Jessica', 28, 'USA', 10000), (2, 'John', 28, 'Canada', 9000)", &[])?; ``` The `select_accounts` method queries your distributed data using the SQL `SELECT` statement. ```rust for row in client.query("SELECT name, age, country, balance FROM DemoAccount", &[])? { let name: &str = row.get("name"); let age: i32 = row.get("age"); let country: &str = row.get("country"); let balance: i32 = row.get("balance"); println!("name = {}, age = {}, country = {}, balance = {}", name, age, country, balance); } ``` The `transfermoneybetween_accounts` method updates your data consistently with distributed transactions. ```rust let mut txn = client.transaction()?; let exec_txn = || -> Result<(), DBError> { txn.execute("UPDATE DemoAccount SET balance = balance - $1 WHERE name = \'Jessica\'", &[&amount])?; txn.execute("UPDATE DemoAccount SET balance = balance + $1 WHERE name = \'John\'", &[&amount])?; txn.commit()?; Ok(()) }; ```