soselo/classes/PgDatabase.php

<?php

class PgDatabase {
	private $db = null;

	public function __construct() {
		$url = trim($_SERVER['REQUEST_URI'], '/');
		$url = substr($url, 7); // api/vX/
		$ps = explode('/', $url);
		if ($ps[0] !== 'database') return;
		$software = $ps[1];

		$config = instance_config($software);
		if ($config === null) return;

		$this->db = pg_connect(
			' host='.$config['psql_host'].
			' port='.$config['psql_port'].
			' dbname='.$config['psql_db'].
			' user='.$config['psql_username'].
			' password='.$config['psql_password'].
		'') or apiresult(['error' => 'Could not connect to postgres: '.pg_last_error()], 500);
	}

	public function is_ok() {
		return $this->db !== null;
	}

	public function escape($str) {
		return pg_escape_string($this->db, $str);
	}

	public function query($sql) {
		$result = pg_query($this->db, $sql);
		if (!$result) apiresult('The postgres query has failed: '.pg_last_error());
		return $result;
	}

	public function fetch_all($sql) {
		$data = [];
		$result = $this->query($sql);
		while ($line = pg_fetch_array($result, null, PGSQL_ASSOC)) {
			$data []= $line;
		}
		pg_free_result($result);
		return $data;
	}

	public function close($result=null) {
		if ($result !== null)
			pg_free_result($result);
		pg_close($this->db);
	}
}