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(Retrofit from trunk) r5051 N.689 workaround on MySQL number of joins limit (61)

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* change MySQLException to store initial exception code
* added a try/catch to launch query with full lazy load (no attr => only id)
* load finalClass field if needed (class is nor standalone nor a final leaf)

SVN:2.4[5052]
This commit is contained in:
Pierre Goiffon
2017-10-19 13:58:39 +00:00
parent 12afcd7cce
commit 11b4085566
2 changed files with 66 additions and 19 deletions
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77
core/dbobjectset.class.php
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@@ -69,7 +69,7 @@ class DBObjectSet implements iDBObjectSetIterator
* @var int
*/
protected $m_iCurrRow;
/*
/**
* @var DBSearch
*/
protected $m_oFilter;
@@ -626,14 +626,7 @@ class DBObjectSet implements iDBObjectSetIterator
// Note: it is mandatory to set this value now, to protect against reentrance
$this->m_bLoaded = true;
if ($this->m_iLimitCount > 0)
{
$sSQL = $this->m_oFilter->MakeSelectQuery($this->GetRealSortOrder(), $this->m_aArgs, $this->m_aAttToLoad, $this->m_aExtendedDataSpec, $this->m_iLimitCount, $this->m_iLimitStart);
}
else
{
$sSQL = $this->m_oFilter->MakeSelectQuery($this->GetRealSortOrder(), $this->m_aArgs, $this->m_aAttToLoad, $this->m_aExtendedDataSpec);
}
$sSQL = $this->_makeSelectQuery($this->m_aAttToLoad);
if (is_object($this->m_oSQLResult))
{
@@ -642,8 +635,36 @@ class DBObjectSet implements iDBObjectSetIterator
$this->m_oSQLResult = null;
}
$this->m_iNumTotalDBRows = null;
$this->m_oSQLResult = CMDBSource::Query($sSQL);
try
{
$this->m_oSQLResult = CMDBSource::Query($sSQL);
} catch (MySQLException $e)
{
// 1116 = ER_TOO_MANY_TABLES
// https://dev.mysql.com/doc/refman/5.7/en/error-messages-server.html#error_er_too_many_tables
if ($e->getCode() != 1116)
{
throw $e;
}
// N.689 Workaround for the 61 max joins in MySQL : full lazy load !
$aAttToLoad = array();
foreach($this->m_oFilter->GetSelectedClasses() as $sClassAlias => $sClass)
{
$aAttToLoad[$sClassAlias] = array();
$bIsAbstractClass = MetaModel::IsAbstract($sClass);
$bIsClassWithChildren = MetaModel::HasChildrenClasses($sClass);
if ($bIsAbstractClass || $bIsClassWithChildren)
{
// we need finalClass field at least to be able to instantiate the real corresponding object !
$aAttToLoad[$sClassAlias]['finalclass'] = MetaModel::GetAttributeDef($sClass, 'finalclass');
}
}
$sSQL = $this->_makeSelectQuery($aAttToLoad);
$this->m_oSQLResult = CMDBSource::Query($sSQL); // may fail again
}
if ($this->m_oSQLResult === false) return;
if (($this->m_iLimitCount == 0) && ($this->m_iLimitStart == 0))
@@ -654,10 +675,33 @@ class DBObjectSet implements iDBObjectSetIterator
}
/**
* The total number of rows in this set. Independently of the SetLimit used for loading the set and taking into account the rows added in-memory.
*
* May actually perform the SQL query SELECT COUNT... if the set was not previously loaded, or loaded with a SetLimit
*
* @param string[] $aAttToLoad
*
* @return string SQL query
*/
private function _makeSelectQuery($aAttToLoad)
{
if ($this->m_iLimitCount > 0)
{
$sSQL = $this->m_oFilter->MakeSelectQuery($this->GetRealSortOrder(), $this->m_aArgs, $aAttToLoad,
$this->m_aExtendedDataSpec, $this->m_iLimitCount, $this->m_iLimitStart);
}
else
{
$sSQL = $this->m_oFilter->MakeSelectQuery($this->GetRealSortOrder(), $this->m_aArgs, $aAttToLoad,
$this->m_aExtendedDataSpec);
}
return $sSQL;
}
/**
* The total number of rows in this set. Independently of the SetLimit used for loading the set and taking into
* account the rows added in-memory.
*
* May actually perform the SQL query SELECT COUNT... if the set was not previously loaded, or loaded with a
* SetLimit
*
* @return int The total number of rows for this set.
*/
public function Count()
@@ -667,11 +711,12 @@ class DBObjectSet implements iDBObjectSetIterator
$sSQL = $this->m_oFilter->MakeSelectQuery(array(), $this->m_aArgs, null, null, 0, 0, true);
$resQuery = CMDBSource::Query($sSQL);
if (!$resQuery) return 0;
$aRow = CMDBSource::FetchArray($resQuery);
CMDBSource::FreeResult($resQuery);
$this->m_iNumTotalDBRows = $aRow['COUNT'];
}
return $this->m_iNumTotalDBRows + count($this->m_aAddedObjects); // Does it fix Trac #887 ??
}