Build a Rust App with CockroachDB

2020-02-16

This tutorial shows you how build a simple Rust application with CockroachDB using a PostgreSQL-compatible driver.

We have tested the Rust Postgres driver enough to claim beta-level support, so that driver is featured here. If you encounter problems, please open an issue with details to help us make progress toward full support.

Before you begin

  1. Install CockroachDB.
  2. Start up a secure or insecure local cluster.
  3. Choose the instructions that correspond to whether your cluster is secure or insecure:

Step 1. Install the Rust Postgres driver

Install the Rust Postgres driver as described in the official documentation.

## Step 2. Create the `maxroach` users and `bank` database {% include {{page.version.version}}/app/create-maxroach-user-and-bank-database.md %} ## Step 3. Generate a certificate for the `maxroach` user Create a certificate and key for the `maxroach` user by running the following command. The code samples will run as this user. {% include copy-clipboard.html %} ~~~ shell $ cockroach cert create-client maxroach --certs-dir=certs --ca-key=my-safe-directory/ca.key ~~~ ## Step 4. Run the Rust code Now that you have a database and a user, you'll run code to create a table and insert some rows, and then you'll run code to read and update values as an atomic [transaction](transactions.html). ### Basic statements First, use the following code to connect as the `maxroach` user and execute some basic SQL statements, inserting rows and reading and printing the rows. Download the basic-sample.rs file, or create the file yourself and copy the code into it. {% include copy-clipboard.html %} ~~~ rust {% include {{ page.version.version }}/app/basic-sample.rs %} ~~~ ### Transaction (with retry logic) Next, use the following code to again connect as the `maxroach` user but this time execute a batch of statements as an atomic transaction to transfer funds from one account to another, where all included statements are either committed or aborted. Download the txn-sample.rs file, or create the file yourself and copy the code into it. {{site.data.alerts.callout_info}} CockroachDB may require the [client to retry a transaction](transactions.html#transaction-retries) in case of read/write contention. CockroachDB provides a generic retry function that runs inside a transaction and retries it as needed. You can copy and paste the retry function from here into your code. {{site.data.alerts.end}} {% include copy-clipboard.html %} ~~~ rust {% include {{ page.version.version }}/app/txn-sample.rs %} ~~~ After running the code, use the [built-in SQL client](use-the-built-in-sql-client.html) to verify that funds were transferred from one account to another: {% include copy-clipboard.html %} ~~~ shell $ cockroach sql --certs-dir=certs -e 'SELECT id, balance FROM accounts' --database=bank ~~~ ~~~ +----+---------+ | id | balance | +----+---------+ | 1 | 900 | | 2 | 350 | +----+---------+ (2 rows) ~~~
## Step 2. Create the `maxroach` users and `bank` database {% include {{page.version.version}}/app/insecure/create-maxroach-user-and-bank-database.md %} ## Step 3. Create a table in the new database As the `maxroach` user, use the [built-in SQL client](use-the-built-in-sql-client.html) to create an `accounts` table in the new database. {% include copy-clipboard.html %} ~~~ shell $ cockroach sql --insecure \ --database=bank \ --user=maxroach \ -e 'CREATE TABLE accounts (id INT PRIMARY KEY, balance INT)' ~~~ ## Step 4. Run the Rust code Now that you have a database and a user, you'll run code to create a table and insert some rows, and then you'll run code to read and update values as an atomic [transaction](transactions.html). ### Basic statements First, use the following code to connect as the `maxroach` user and execute some basic SQL statements, inserting rows and reading and printing the rows. Download the basic-sample.rs file, or create the file yourself and copy the code into it. {% include copy-clipboard.html %} ~~~ rust {% include {{ page.version.version }}/app/insecure/basic-sample.rs %} ~~~ ### Transaction (with retry logic) Next, use the following code to again connect as the `maxroach` user but this time execute a batch of statements as an atomic transaction to transfer funds from one account to another, where all included statements are either committed or aborted. Download the txn-sample.rs file, or create the file yourself and copy the code into it. {{site.data.alerts.callout_info}} CockroachDB may require the [client to retry a transaction](transactions.html#transaction-retries) in case of read/write contention. CockroachDB provides a generic retry function that runs inside a transaction and retries it as needed. You can copy and paste the retry function from here into your code. {{site.data.alerts.end}} {% include copy-clipboard.html %} ~~~ rust {% include {{ page.version.version }}/app/insecure/txn-sample.rs %} ~~~ After running the code, use the [built-in SQL client](use-the-built-in-sql-client.html) to verify that funds were transferred from one account to another: {% include copy-clipboard.html %} ~~~ shell $ cockroach sql --insecure -e 'SELECT id, balance FROM accounts' --database=bank ~~~ ~~~ +----+---------+ | id | balance | +----+---------+ | 1 | 900 | | 2 | 350 | +----+---------+ (2 rows) ~~~

What's next?

Read more about using the Rust Postgres driver.

You might also be interested in using a local cluster to explore the following CockroachDB benefits: