GitHub - voryx/PgAsync: Asynchronous Reactive Postgres Library in Pure PHP
source link: https://github.com/voryx/PgAsync
Go to the source link to view the article. You can view the picture content, updated content and better typesetting reading experience. If the link is broken, please click the button below to view the snapshot at that time.
README.md
PgAsync
Asynchronous Reactive Postgres Library for PHP (Non-blocking)
What it is
This is an asynchronous Postgres library for PHP. Observables are returned by the query methods allowing asynchronous row-by-row data handling (and other Rx operators on the data) See Rx.PHP. Network and event processing is handled by ReactPHP.
This is a pure PHP implementation (you don't need Postgres extensions to use it).
Example - Simple Query
$client = new PgAsync\Client([ "host" => "127.0.0.1", "port" => "5432", "user" => "matt", "database" => "matt" ]); $client->query('SELECT * FROM channel')->subscribe( function ($row) { var_dump($row); }, function ($e) { echo "Failed.\n"; }, function () { echo "Complete.\n"; } );
Example - parameterized query
$client = new PgAsync\Client([ "host" => "127.0.0.1", "port" => "5432", "user" => "matt", "database" => "matt", "auto_disconnect" => true //This option will force the client to disconnect as soon as it completes. The connection will not be returned to the connection pool. ]); $client->executeStatement('SELECT * FROM channel WHERE id = $1', ['5']) ->subscribe( function ($row) { var_dump($row); }, function ($e) { echo "Failed.\n"; }, function () { echo "Complete.\n"; } );
Example - LISTEN/NOTIFY
$client = new PgAsync\Client([ "host" => "127.0.0.1", "port" => "5432", "user" => "matt", "database" => "matt" ]); $client->listen('some_channel') ->subscribe(function (\PgAsync\Message\NotificationResponse $message) { echo $message->getChannelName() . ': ' . $message->getPayload() . "\n"; }); $client->query("NOTIFY some_channel, 'Hello World'")->subscribe();
Install
With composer install into you project with:
Install pgasync:
composer require voryx/pgasync
What it can do
- Run queries (CREATE, UPDATE, INSERT, SELECT, DELETE)
- Queue commands
- Return results asynchronously (using Observables - you get data one row at a time as it comes from the db server)
- Prepared statements (as parameterized queries)
- Connection pooling (basic pooling)
What it can't quite do yet
- Transactions
What's next
- Add more testing
- Transactions
- Take over the world
Keep in mind
This is an asynchronous library. If you begin 3 queries (subscribe to their observable):
$client->query("SELECT * FROM table1")->subscribe(...); $client->query("SELECT * FROM table2")->subscribe(...); $client->query("SELECT * FROM table3")->subscribe(...);
It will start all of them almost simultaneously (and you will begin receiving rows on all 3 before any of them have completed). This can be great if you want to run 3 queries at the same time, but if you have some queries that need information that was modified by other statements, this can cause a race condition:
$client->query("INSERT INTO invoices(inv_no, customer_id, amount) VALUES('1234A', 1, 35.75)")->subscribe(...); $client->query("SELECT SUM(amount) AS balance FROM invoices WHERE customer_id = 1")->subscribe(...);
In the above situation, your balance may or may not include the invoice inserted on the first line.
You can avoid this by using the Rx concat* operator to only start up the second observable after the first has completed:
$insert = $client->query("INSERT INTO invoices(inv_no, customer_id, amount) VALUES('1234A', 1, 35.75)"); $select = $client->query("SELECT SUM(amount) AS balance FROM invoices WHERE customer_id = 1"); $insert ->concat($select) ->subscribe(...);
Recommend
About Joyk
Aggregate valuable and interesting links.
Joyk means Joy of geeK