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<?php
namespace Laminas\Db\Adapter\Driver\Pgsql;
use Laminas\Db\Adapter\Driver\AbstractConnection;
use Laminas\Db\Adapter\Exception;
use Laminas\Db\ResultSet\ResultSetInterface;
use PgSql\Connection as PgSqlConnection;
use function array_filter;
use function defined;
use function http_build_query;
use function is_array;
use function is_resource;
use function pg_connect;
use function pg_fetch_result;
use function pg_last_error;
use function pg_query;
use function pg_set_client_encoding;
use function restore_error_handler;
use function set_error_handler;
use function sprintf;
use function str_replace;
use function urldecode;
use const PGSQL_CONNECT_ASYNC;
use const PGSQL_CONNECT_FORCE_NEW;
class Connection extends AbstractConnection
{
/** @var Pgsql */
protected $driver;
/** @var resource */
protected $resource;
/** @var null|int PostgreSQL connection type */
protected $type;
/**
* Constructor
*
* @param resource|array|null $connectionInfo
*/
public function __construct($connectionInfo = null)
{
if (is_array($connectionInfo)) {
$this->setConnectionParameters($connectionInfo);
} elseif ($connectionInfo instanceof PgSqlConnection || is_resource($connectionInfo)) {
$this->setResource($connectionInfo);
}
}
/**
* Set resource
*
* @param resource $resource
* @return $this Provides a fluent interface
*/
public function setResource($resource)
{
$this->resource = $resource;
return $this;
}
/**
* Set driver
*
* @return $this Provides a fluent interface
*/
public function setDriver(Pgsql $driver)
{
$this->driver = $driver;
return $this;
}
/**
* @param int|null $type
* @return $this Provides a fluent interface
*/
public function setType($type)
{
$invalidConectionType = $type !== PGSQL_CONNECT_FORCE_NEW;
// Compatibility with PHP < 5.6
if ($invalidConectionType && defined('PGSQL_CONNECT_ASYNC')) {
$invalidConectionType = $type !== PGSQL_CONNECT_ASYNC;
}
if ($invalidConectionType) {
throw new Exception\InvalidArgumentException(
'Connection type is not valid. (See: http://php.net/manual/en/function.pg-connect.php)'
);
}
$this->type = $type;
return $this;
}
/**
* {@inheritDoc}
*
* @return null|string
*/
public function getCurrentSchema()
{
if (! $this->isConnected()) {
$this->connect();
}
$result = pg_query($this->resource, 'SELECT CURRENT_SCHEMA AS "currentschema"');
if ($result === false) {
return null;
}
return pg_fetch_result($result, 0, 'currentschema');
}
/**
* {@inheritDoc}
*
* @throws Exception\RuntimeException On failure.
*/
public function connect()
{
if ($this->resource instanceof PgSqlConnection || is_resource($this->resource)) {
return $this;
}
$connection = $this->getConnectionString();
set_error_handler(function ($number, $string) {
throw new Exception\RuntimeException(
self::class . '::connect: Unable to connect to database',
$number ?? 0,
new Exception\ErrorException($string, $number ?? 0)
);
});
try {
$this->resource = pg_connect($connection);
} finally {
restore_error_handler();
}
if ($this->resource === false) {
throw new Exception\RuntimeException(sprintf(
'%s: Unable to connect to database',
__METHOD__
));
}
$p = $this->connectionParameters;
if (! empty($p['charset'])) {
if (-1 === pg_set_client_encoding($this->resource, $p['charset'])) {
throw new Exception\RuntimeException(sprintf(
"%s: Unable to set client encoding '%s'",
__METHOD__,
$p['charset']
));
}
}
return $this;
}
/**
* {@inheritDoc}
*/
public function isConnected()
{
return $this->resource instanceof PgSqlConnection || is_resource($this->resource);
}
/**
* {@inheritDoc}
*/
public function disconnect()
{
// phpcs:ignore SlevomatCodingStandard.Namespaces.ReferenceUsedNamesOnly.ReferenceViaFallbackGlobalName
pg_close($this->resource);
return $this;
}
/**
* {@inheritDoc}
*/
public function beginTransaction()
{
if ($this->inTransaction()) {
throw new Exception\RuntimeException('Nested transactions are not supported');
}
if (! $this->isConnected()) {
$this->connect();
}
pg_query($this->resource, 'BEGIN');
$this->inTransaction = true;
return $this;
}
/**
* {@inheritDoc}
*/
public function commit()
{
if (! $this->isConnected()) {
$this->connect();
}
if (! $this->inTransaction()) {
return; // We ignore attempts to commit non-existing transaction
}
pg_query($this->resource, 'COMMIT');
$this->inTransaction = false;
return $this;
}
/**
* {@inheritDoc}
*/
public function rollback()
{
if (! $this->isConnected()) {
throw new Exception\RuntimeException('Must be connected before you can rollback');
}
if (! $this->inTransaction()) {
throw new Exception\RuntimeException('Must call beginTransaction() before you can rollback');
}
pg_query($this->resource, 'ROLLBACK');
$this->inTransaction = false;
return $this;
}
/**
* {@inheritDoc}
*
* @throws Exception\InvalidQueryException
* @return resource|ResultSetInterface
*/
public function execute($sql)
{
if (! $this->isConnected()) {
$this->connect();
}
if ($this->profiler) {
$this->profiler->profilerStart($sql);
}
$resultResource = pg_query($this->resource, $sql);
if ($this->profiler) {
$this->profiler->profilerFinish($sql);
}
// if the returnValue is something other than a pg result resource, bypass wrapping it
if ($resultResource === false) {
throw new Exception\InvalidQueryException(pg_last_error($this->resource));
}
return $this->driver->createResult($resultResource === true ? $this->resource : $resultResource);
}
/**
* {@inheritDoc}
*
* @return string
*/
public function getLastGeneratedValue($name = null)
{
if ($name === null) {
return;
}
$result = pg_query(
$this->resource,
'SELECT CURRVAL(\'' . str_replace('\'', '\\\'', $name) . '\') as "currval"'
);
return pg_fetch_result($result, 0, 'currval');
}
/**
* Get Connection String
*
* @return string
*/
private function getConnectionString()
{
// localize
$p = $this->connectionParameters;
// given a list of key names, test for existence in $p
$findParameterValue = function (array $names) use ($p) {
foreach ($names as $name) {
if (isset($p[$name])) {
return $p[$name];
}
}
return;
};
$connectionParameters = [
'host' => $findParameterValue(['hostname', 'host']),
'user' => $findParameterValue(['username', 'user']),
'password' => $findParameterValue(['password', 'passwd', 'pw']),
'dbname' => $findParameterValue(['database', 'dbname', 'db', 'schema']),
'port' => isset($p['port']) ? (int) $p['port'] : null,
'socket' => $p['socket'] ?? null,
];
return urldecode(http_build_query(array_filter($connectionParameters), '', ' '));
}
}