build-a-php-app-with-cockroachdb.md

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Build a PHP App with CockroachDB	Learn how to use CockroachDB from a simple PHP application with a low-level client driver.	true	false

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

We have tested the php-pgsql 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

{% include {{page.version.version}}/app/before-you-begin.md %}

Step 1. Install the php-pgsql driver

Install the php-pgsql driver as described in the official documentation.

Step 2. Create the maxroach user 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 %}

$ cockroach cert create-client maxroach --certs-dir=certs --ca-key=my-safe-directory/ca.key

Step 4. Run the PHP 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.

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.php file, or create the file yourself and copy the code into it.

{% include copy-clipboard.html %}

{% include {{ page.version.version }}/app/basic-sample.php %}

The output should be:

Account balances:
1: 1000
2: 250

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.php 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 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 %}

{% include {{ page.version.version }}/app/txn-sample.php %}

The output should be:

Account balances after transfer:
1: 900
2: 350

To verify that funds were transferred from one account to another, use the built-in SQL client:

{% include copy-clipboard.html %}

$ 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 user and bank database

{% include {{page.version.version}}/app/insecure/create-maxroach-user-and-bank-database.md %}

Step 3. Run the PHP 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.

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.php file, or create the file yourself and copy the code into it.

{% include copy-clipboard.html %}

{% include {{ page.version.version }}/app/insecure/basic-sample.php %}

The output should be:

Account balances:
1: 1000
2: 250

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.php 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 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 %}

{% include {{ page.version.version }}/app/insecure/txn-sample.php %}

The output should be:

Account balances after transfer:
1: 900
2: 350

To verify that funds were transferred from one account to another, use the built-in SQL client:

{% include copy-clipboard.html %}

$ 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 php-pgsql driver.

{% include {{ page.version.version }}/app/see-also-links.md %}