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pq\Connection: General Usage

What is needed to create, check and reset a connection.

Creating a connection:

Creating a connection to the PostgreSQL server is as simple as:


<?php

$connection = new pq\Connection("dbname=test user=test password=test");

?>

The first argument to the Connection constructor is a connection string as described in the PostgreSQL documentation.

Optional flags are accepted as second argument. See connection flag constants.

Creating a persistent connection: 


<?php

$connection = new pq\Connection("dbname=test user=test password=test", pq\Connection::PERSISTENT);

?>

Creating an asynchronously opened connection: 


<?php

$connection = new pq\Connection("dbname=test user=test password=test", pq\Connection::ASYNC);

?>

Checking the connection status:

The connection object provides a public readonly property pq\Connection::$status, which value can be one of the connection status constants.


<?php

switch ($connection->status) {
case pq\Connection::OK:
  // connection complete
  break;
case pq\Connection::BAD:
  $connection->reset();
  break;
default:
  // connection in progress
  break;
}

?>

Resetting the connection: 


<?php

$connection->reset();

?>

Attempt to close the connection to the server and reestablish a new connection with the same connection parameters previously used.

Closing the connection: 


<?php

$connection = NULL;

?>

Non-persistent connections:

A non-persistent connection will be closed when all references to the pq\Connection object are gone.

Persistent connections:

A persistent connection will be recycled, when it is not referenced any longer.

There is also some cleanup performed, so that subsequent usage is as unimpaired as possible: