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Fixes issue (DBAL-1057) use default platform when not connected #783

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Fixes issue (DBAL-1057) use default platform when not connected #783

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23fc603
Fixes issue (DBAL-1057) where simply initiating the platform may caus…
weaverryan Jan 23, 2015
e90bdcd
Adding a test, which WAS failing before this patch
weaverryan Jan 23, 2015
8193333
Removing test that's failing, but because it is invalid - see #784
weaverryan Jan 23, 2015
2db254d
Changing implementation to *try* to connect
weaverryan Jan 23, 2015
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13 changes: 11 additions & 2 deletions lib/Doctrine/DBAL/Connection.php
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@
namespace Doctrine\DBAL;

use Doctrine\DBAL\Driver\ServerInfoAwareConnection;
use Doctrine\DBAL\Exception\DriverException;
use Doctrine\DBAL\Exception\InvalidArgumentException;
use PDO;
use Closure;
Expand Down Expand Up @@ -424,9 +425,17 @@ private function getDatabasePlatformVersion()
return $this->_params['serverVersion'];
}

// If not connected, we need to connect now to determine the platform version.
// If not connected, we can't figure out the server version. If
// we try to connect, it may fail (e.g. no database), which would
// cause an error in our application when determining the platform
// version is not mission-critical
if (null === $this->_conn) {
$this->connect();
try {
$this->connect();
} catch (DriverException $e) {
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I'm still unhappy silencing all kind of connection errors as it also silences errors for valid credentials when there are other problems such as failing network or whatever.
Returning the default platform in such cases still might be fine 90% of the time but in IMO this is a hack to come around "invalid" (since 2.5) getDatabasePlatform() calls from userland. This really is breaking the feature that was implemented here and might be causing more trouble in the end than it solves.
The question is why do you need the platform at all if not connected? And what advantage do you have by retrieving just "some" platform that might be incompatible with your backend anyways? Before DBAL 2.5 that was just plain wrong IMO.
One might strongly disagree with my opinion here and "just don't care" but then all this platform version specific behaviour stuff that got implemented over the past few years is pretty useless.
I get the problems and the frustration this issue currently creates but we really please should not hack around that feature here. Instead we should fix calling libs to just use DBAL in the right way or revert the whole feature...
Just my 2 cents...

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@deeky666 the issue is that many places in Doctrine ORM (and in some places in DBAL too IIRC) are retrieving the platform eagerly in constructors to optimize performance by avoiding to call the platform getter multiple times.

// i.e. connection params are invalid or db doesn't exist
return null;
}
}

// Automatic platform version detection.
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11 changes: 5 additions & 6 deletions tests/Doctrine/Tests/DBAL/ConnectionTest.php
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Expand Up @@ -403,13 +403,12 @@ public function testFetchColumn()
$this->assertSame($result, $conn->fetchColumn($statement, $params, $column, $types));
}

public function testConnectionIsClosed()
public function testGetPlatformVersionDoesNotFailOnBadConnection()
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@weaverryan why was this test actually removed?

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I don't believe this is a valid test, which is what I'm arguing here: https://github.com/doctrine/dbal/pull/784/files#r23499338. I would like to remove this test - I was using that PR simply to abuse Travis to show how the test was passing for the wrong reason.

{
$this->_conn->close();

$this->setExpectedException('Doctrine\\DBAL\\Exception\\DriverException');

$this->_conn->quoteIdentifier('Bug');
// the connection uses bogus connection requirements, so connecting
// *will* fail. We should be able to call this without connection
// and causing that exception
$this->_conn->getDatabasePlatform();
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Missing assertion (should assert that the returned value is null)

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Actually, the database platform will never be null, and the point of the test is simply to show that asking for the database platform (with invalid connection credentials, which this test class uses) no longer causes an exception. If you removed my "fix" in this PR, calling getDatabasePlatform() would actually explode.

I can add an assertion that the database platform is in fact not null (it is always determine, it's just that it uses the default platform if it cannot connect to get the version), but the real point is that this doesn't cause an exception.

I feel like you and I aren't quite on the same page with this change and #784. I am vastly less qualified than you in this library, so perhaps it's my mistake, and if so - I appreciate the help clarifying :). Overall, I'm simply trying to fix the change in behavior where calling getDatabasePlatform() began throwing an exception if a connection couldn't be made (instead of using the default platform, like in earlier versions of DBAL).

Thanks!

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began throwing an exception if a connection couldn't be made (instead of using the default platform, like in earlier versions of DBAL).

Yeah, well, it's due to platform detection, as already discussed.

I'm also not very qualified to talk about the DBAL: it's mainly @deeky666's competence area.

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Cool, I would like to hear what @deeky666 thinks then :).

I'm here because the exception has wide-reaching consequences that are affecting Symfony users - e.g. doctrine/DoctrineBundle#351 and symfony/symfony-standard#774.

Thanks for the attention!

}

public function testFetchAll()
Expand Down