xPDO Retrieving joined rows out of many-to-many tables - My Forums

Re: xPDO Retrieving joined rows out of many-to-many tables

fadliawan — Apr 20, 2012, 05:11 AM

I've tried this and it only returns the fields of the first table. Why is that?

Re: xPDO Retrieving joined rows out of many-to-many tables

maciej.m — Oct 08, 2009, 12:31 PM

Quote from: OpenGeek at Oct 08, 2009, 04:57 PM

You can’t return data like that as a collection of objects with getCollection.

I don’t actually understand what does it mean ’data like that’. What is the difference between code Shaun’s given and which returned results:

$c = $modx->newQuery('klimaFirmy');
$c->select('
     klimaFirmy.*,
     (SELECT GROUP_CONCAT(region) FROM '.$modx->getTableName('klimaRegion').' ORDER BY region ASC ) AS regiony
');
$c->leftJoin('klimaFirmaRegion','FirmaRegion');
$c->leftJoin('klimaRegion','Region','Region.id = FirmaRegion.region');
$c->where(array(
    'klimaFirma.nazwa:LIKE' => '%ma%',
));
$c->sortby('klimaFirmy.id','ASC');
$c->groupby('klimaFirmy.id');
$collection = $modx->getCollection('klimaFirmy',$c);

and my code:

$c = $modx->newQuery('klimaFirma');
$c->select('
	 GROUP_CONCAT 
	 ( Region.region ORDER BY Region.region ASC )
	 regiony, klimaFirma.*
');
$c->leftJoin('klimaFirmaRegion','FirmaRegion');
$c->leftJoin('klimaRegion','Region','Region.id = FirmaRegion.region');
$c->where(array(
	'klimaFirma.nazwa:LIKE' => '%ma%',
));
$c->sortby('klimaFirma.id','ASC');
$c->groupby('klimaFirma.id');


$firmy = $modx->getCollection('klimaFirma', $c);

foreach ($firmy as $firma) {
	print('
'.$firma->get('nazwa').' '.$firma->get('regiony'));
}

echo 'Wszystkie firmy: '.count($firmy);

Re: xPDO Retrieving joined rows out of many-to-many tables

opengeek — Oct 08, 2009, 11:57 AM

You can’t return data like that as a collection of objects with getCollection. Just use the PDO statement you are creating, execute it, and fetch the results as you would with any PDO statement. If you need to create objects out of the fetched rows, just use newObject() and fromArray() to manually hydrate the objects.

Re: xPDO Retrieving joined rows out of many-to-many tables

maciej.m — Oct 08, 2009, 11:40 AM

Ok, finally I got query which should work, but it doesn’t (code below).
I use toSQL() function to debug. Then I cut-n-paste SQL query to PhpMyAdmin.
This returns results in PhpMyAdmin but not on a webpage.

$c = $modx->newQuery('klimaFirma');
$c->select('
	 GROUP_CONCAT 
	 ( Region.region ORDER BY Region.region ASC )
	 regiony, klimaFirma.*
');
$c->leftJoin('klimaFirmaRegion','FirmaRegion');
$c->leftJoin('klimaRegion','Region','Region.id = FirmaRegion.region');
$c->where(array(
	'klimaFirma.nazwa:LIKE' => '%ma%',
));
$c->sortby('klimaFirma.id','ASC');
$c->groupby('klimaFirma.id');


$c->prepare();
$sql = $c->toSQL();

echo $sql; // Printing SQL statement which I then try in PhpMyAdmin

$firmy = $modx->getCollection('klimaFirma', $c);

foreach ($firmy as $firma) {
	print('
'.$firma->get('nazwa').' '.$firma->get('regiony'));
}

echo 'Wszystkie firmy: '.count($firmy)

;

Re: xPDO Retrieving joined rows out of many-to-many tables

maciej.m — Oct 08, 2009, 10:00 AM

There was a problem with SEPARATOR ’;;;’. After I removed it returned but with all records from modx_klima_regiony table in new ’regiony’ field.

DEBUG:

SELECT klimaFirma.*, (SELECT GROUP_CONCAT(region) FROM `modx_klima_regiony` ORDER BY region ASC SEPARATOR ";;;" ) AS regiony FROM `modx_klima_firmy` AS `klimaFirma` LEFT JOIN `modx_klima_firma_region` `FirmaRegion` ON `klimaFirma`.`id` = `FirmaRegion`.`firma` LEFT JOIN `modx_klima_regiony` `Region` ON Region.id = FirmaRegion.region WHERE `klimaFirma`.`nazwa` LIKE '%ma%' GROUP BY klimaFirma.id ORDER BY klimaFirma.id ASC

I’ve also noticed that two of the following are not equivalent (at least they don’t return similar results)

SELECT * FROM `modx_klima_firmy` 
LEFT JOIN `modx_klima_firma_region` 
ON (modx_klima_firmy.id = modx_klima_firma_region.firma) 
LEFT JOIN `modx_klima_regiony` 
ON (modx_klima_regiony.id = modx_klima_firma_region.region);

AND

$query = $modx->newQuery('klimaFirma');
$query->select('klimaFirma.*, Region.region AS region, Region.id AS reg_id');
$query->leftJoin('klimaFirmaRegion','FirmaRegion', 'klimaFirma.id = FirmaRegion.firma');
$query->leftJoin('klimaRegion','Region','Region.id = FirmaRegion.region');

The first returns duplicated data (for each Region Firma has)
The second doesn’t.

Re: xPDO Retrieving joined rows out of many-to-many tables

splittingred — Oct 08, 2009, 09:01 AM

Quote from: maciej.m at Oct 08, 2009, 11:55 AM

Now I have such ’complex’ (?) query as:

SELECT GROUP_CONCAT( modx_klima_regiony.region
ORDER BY modx_klima_regiony.region ASC 
SEPARATOR  ';;;' ) regiony, modx_klima_firmy. * 
FROM modx_klima_firmy
LEFT JOIN modx_klima_firma_region ON ( modx_klima_firmy.id = modx_klima_firma_region.firma ) 
LEFT JOIN modx_klima_regiony ON ( modx_klima_regiony.id = modx_klima_firma_region.region ) 
WHERE modx_klima_firmy.nazwa LIKE '%ma%'
GROUP BY modx_klima_firmy.id
ORDER BY modx_klima_firmy.nazwa ASC

$c = $modx->newQuery('klimaFirmy');
$c->select('
     klimaFirmy.*,
     (SELECT GROUP_CONCAT(region) FROM '.$modx->getTableName('klimaRegion').' ORDER BY region ASC SEPARATOR  ";;;" ) AS regiony
');
$c->leftJoin('klimaFirmaRegion','FirmaRegion');
$c->leftJoin('klimaRegion','Region','Region.id = FirmaRegion.region');
$c->where(array(
    'klimaFirma.nazwa:LIKE' => '%ma%',
));
$c->sortby('klimaFirmy.id','ASC');
$c->groupby('klimaFirmy.id');
$collection = $modx->getCollection('klimaFirmy',$c);

or something like that.

I strongly recommend reading thoroughly the xPDO docs and the API docs.

Re: xPDO Retrieving joined rows out of many-to-many tables

maciej.m — Oct 08, 2009, 06:55 AM

Now I have such ’complex’ (?) query as:

SELECT GROUP_CONCAT( modx_klima_regiony.region
ORDER BY modx_klima_regiony.region ASC 
SEPARATOR  ';;;' ) regiony, modx_klima_firmy. * 
FROM modx_klima_firmy
LEFT JOIN modx_klima_firma_region ON ( modx_klima_firmy.id = modx_klima_firma_region.firma ) 
LEFT JOIN modx_klima_regiony ON ( modx_klima_regiony.id = modx_klima_firma_region.region ) 
WHERE modx_klima_firmy.nazwa LIKE '%ma%'
GROUP BY modx_klima_firmy.id
ORDER BY modx_klima_firmy.nazwa ASC

I’m not sure how to translate it into xPDO

--
Regards
MM

Re: xPDO Retrieving joined rows out of many-to-many tables

maciej.m — Oct 07, 2009, 10:05 AM

Though I still don’t understand this line:
$query->leftJoin(’klimaRegion’,’Region’,’FirmaRegion.region = Region.id’);

You’re just specifying the criteria manually for the JOIN. You’re saying, only JOIN if FirmaRegion’s region field is equal to the JOINed table’s ID field.

In return: Id like to report a mistake in xPDO documentation:
http://svn.modxcms.com/docs/display/XPDO10/xPDOQuery
In example -> $c->sortby - should be $query->sortby (and following lines)
Am I right?

You are; it’s been corrected. Thanks!

Re: xPDO Retrieving joined rows out of many-to-many tables

splittingred — Oct 07, 2009, 09:45 AM

Your query can look like this:

$query = $modx->newQuery('klimaFirma');
$query->select('klimaFirma.*, Region.region AS region');
$query->leftJoin('klimaFirmaRegion','FirmaRegion');
$query->leftJoin('klimaRegion','Region','FirmaRegion.region = Region.id');

$firmy = $modx->getCollection('klimaFirma', $query);
foreach ($firmy as $firma) {
	echo '
'.$firma->get('nazwa').' '.$firma->get('region');
}

Re: xPDO Retrieving joined rows out of many-to-many tables

splittingred — Oct 07, 2009, 09:42 AM

Well, for one, in your klimaFirmaRegion xml schema definition, you have ’fields’ instead of ’field’.