<?php

/*
 * @copyright   Copyright (C) 2010-2024 Combodo SAS
 * @license     http://opensource.org/licenses/AGPL-3.0
 */

/**
 * @package     iTopORM
 * @api
 * @see DBObjectSearch::__construct()
 * @see DBUnionSearch::__construct()
 */
abstract class DBSearch
{
	/** @internal */
	public const JOIN_POINTING_TO = 0;
	/** @internal */
	public const JOIN_REFERENCED_BY = 1;

	protected $m_bNoContextParameters = false;
	/** @var array For {@see iQueryModifier} impl */
	protected $m_aModifierProperties = [];
	protected $m_bArchiveMode = false;
	protected $m_bShowObsoleteData = true;

	/**
	 * DBSearch constructor.
	 *
	 * @api
	 * @see DBSearch::FromOQL()
	 */
	public function __construct()
	{
		$this->Init();
	}

	/**
	 * called by the constructor
	 * @internal Set the obsolete and archive modes to the default ones
	 */
	protected function Init()
	{
		$this->m_bArchiveMode = utils::IsArchiveMode();
		$this->m_bShowObsoleteData = true;
	}

	/**
	 * Perform a deep clone (as opposed to "clone" which does copy a reference to the underlying objects)
	 *
	 * @internal
	 *
	 * @return \DBSearch
	 **/
	public function DeepClone()
	{
		return unserialize(serialize($this)); // Beware this serializes/unserializes the search and its parameters as well
	}

	/**
	 * @api
	 * @see IsAllDataAllowed()
	 *
	 * @param bool $bAllowAllData whether or not some information should be hidden to the current user.
	 */
	abstract public function AllowAllData($bAllowAllData = true);

	/**
	 * Current state of AllowAllData
	 *
	 * @internal
	 * @see AllowAllData()
	 *
	 * @return mixed
	 */
	abstract public function IsAllDataAllowed();

	/**
	 * Should the archives be fetched
	 *
	 * @internal
	 *
	 * @param $bEnable
	 */
	public function SetArchiveMode($bEnable)
	{
		$this->m_bArchiveMode = $bEnable;
	}

	/**
	 * @internal
	 * @return bool
	 */
	public function GetArchiveMode()
	{
		return $this->m_bArchiveMode;
	}

	/**
	 * Should the obsolete data be fetched
	 *
	 * @internal
	 * @param $bShow
	 */
	public function SetShowObsoleteData($bShow)
	{
		$this->m_bShowObsoleteData = $bShow;
	}

	/**
	 * @internal
	 * @return bool
	 */
	public function GetShowObsoleteData()
	{
		if ($this->m_bArchiveMode || $this->IsAllDataAllowed()) {
			// Enable obsolete data too!
			$bRet = true;
		} else {
			$bRet = $this->m_bShowObsoleteData;
		}
		return $bRet;
	}

	/**
	 * @internal
	 */
	public function NoContextParameters()
	{
		$this->m_bNoContextParameters = true;
	}

	/**
	 * @internal
	 * @return bool
	 */
	public function HasContextParameters()
	{
		return $this->m_bNoContextParameters;
	}

	/**
	 * @internal
	 *
	 * @param $sPluginClass
	 * @param $sProperty
	 * @param $value
	 */
	public function SetModifierProperty($sPluginClass, $sProperty, $value)
	{
		$this->m_aModifierProperties[$sPluginClass][$sProperty] = $value;
	}

	/**
	 * @internal
	 *
	 * @param $sPluginClass
	 *
	 * @return array|mixed
	 */
	public function GetModifierProperties($sPluginClass)
	{
		if (array_key_exists($sPluginClass, $this->m_aModifierProperties)) {
			return $this->m_aModifierProperties[$sPluginClass];
		} else {
			return [];
		}
	}

	/**
	 * @internal
	 * @param $sAlias
	 *
	 * @return mixed
	 */
	abstract public function GetClassName($sAlias);

	/**
	 * @internal
	 * @return mixed
	 */
	abstract public function GetClass();

	/**
	 * @internal
	 * @return mixed
	 */
	abstract public function GetClassAlias();

	/**
	 * @return string
	 * @internal
	 */
	abstract public function GetFirstJoinedClass();

	/**
	 * Change the class
	 *
	 * Defaults to the first selected class (most of the time it is also the first joined class
	 * only subclasses are supported as of now, because the conditions must fit the new class
	 *
	 * @internal
	 */
	abstract public function ChangeClass($sNewClass, $sAlias = null);

	/**
	 * @internal
	 * @return mixed
	 */
	abstract public function GetSelectedClasses();

	/**
	 * @internal
	 * @param array $aSelectedClasses array of aliases
	 * @throws CoreException
	 */
	abstract public function SetSelectedClasses($aSelectedClasses);

	/**
	 * Change any alias of the query tree
	 *
	 * @internal
	 *
	 * @param $sOldName
	 * @param $sNewName
	 * @return bool True if the alias has been found and changed
	 */
	abstract public function RenameAlias($sOldName, $sNewName);

	abstract public function RenameAliasesInNameSpace($aClassAliases, $aAliasTranslation = []);

	abstract public function TranslateConditions($aTranslationData, $bMatchAll = true, $bMarkFieldsAsResolved = true);

	/**
	 * @internal
	 * @return mixed
	 */
	abstract public function IsAny();

	/**
	 * @internal
	 * @deprecated use ToOQL() instead
	 * @return string
	 */
	public function Describe()
	{
		DeprecatedCallsLog::NotifyDeprecatedPhpMethod('use ToOQL() instead');

		return 'deprecated - use ToOQL() instead';
	}

	/**
	 * @internal
	 * @deprecated use ToOQL() instead
	 * @return string
	 */
	public function DescribeConditionPointTo($sExtKeyAttCode, $aPointingTo)
	{
		DeprecatedCallsLog::NotifyDeprecatedPhpMethod('use ToOQL() instead');

		return 'deprecated - use ToOQL() instead';
	}

	/**
	 * @internal
	 * @deprecated use ToOQL() instead
	 * @return string
	 */
	public function DescribeConditionRefBy($sForeignClass, $sForeignExtKeyAttCode)
	{
		DeprecatedCallsLog::NotifyDeprecatedPhpMethod('use ToOQL() instead');

		return 'deprecated - use ToOQL() instead';
	}

	/**
	 * @internal
	 * @deprecated use ToOQL() instead
	 * @return string
	 */
	public function DescribeConditionRelTo($aRelInfo)
	{
		DeprecatedCallsLog::NotifyDeprecatedPhpMethod('use ToOQL() instead');

		return 'deprecated - use ToOQL() instead';
	}

	/**
	 * @internal
	 * @deprecated use ToOQL() instead
	 * @return string
	 */
	public function DescribeConditions()
	{
		DeprecatedCallsLog::NotifyDeprecatedPhpMethod('use ToOQL() instead');

		return 'deprecated - use ToOQL() instead';
	}

	/**
	 * @internal
	 * @deprecated use ToOQL() instead
	 * @return string
	 */
	public function __DescribeHTML()
	{
		DeprecatedCallsLog::NotifyDeprecatedPhpMethod('use ToOQL() instead');

		return 'deprecated - use ToOQL() instead';
	}

	/**
	 * @internal
	 * @return mixed
	 */
	abstract public function ResetCondition();

	/**
	 * add $oExpression as a OR
	 *
	 * @api
	 * @see DBSearch::AddConditionExpression()
	 *
	 * @param Expression $oExpression
	 *
	 * @return mixed
	 */
	abstract public function MergeConditionExpression($oExpression);

	/**
	 * add $oExpression as a AND
	 *
	 * @api
	 * @see DBSearch::MergeConditionExpression()
	 *
	 * @param Expression $oExpression
	 *
	 * @return mixed
	 */
	abstract public function AddConditionExpression($oExpression);

	/**
	 * Condition on the friendlyname
	 *
	 * Restrict the query to only the corresponding selected class' friendlyname
	 *
	 * @internal
	 *
	 * @param string $sName the desired friendlyname
	 *
	 * @return mixed
	 */
	abstract public function AddNameCondition($sName);

	/**
	 * Add a condition
	 *
	 * This is the simplest way to express a AND condition. For complex use cases, use MergeConditionExpression or AddConditionExpression instead
	 *
	 * @api
	 *
	 * @param string $sFilterCode
	 * @param mixed  $value
	 * @param string $sOpCode operator to use : '=' (default), '!=', 'IN', 'NOT IN'
	 *
	 * @throws \CoreException
	 *
	 */
	abstract public function AddCondition($sFilterCode, $value, $sOpCode = null);
	/**
	 * Specify a condition on external keys or link sets
	 *
	 * @internal
	 *
	 * @param string $sAttSpec Can be either an attribute code or extkey->[sAttSpec] or linkset->[sAttSpec] and so on, recursively
	 *                 Example: infra_list->ci_id->location_id->country
	 * @param mixed $value The value to match (can be an array => IN(val1, val2...)
	 * @return void
	 */
	abstract public function AddConditionAdvanced($sAttSpec, $value);

	/**
	 * @internal
	 *
	 * @param string $sFullText
	 *
	 * @return mixed
	 */
	abstract public function AddCondition_FullText($sFullText);

	abstract public function AddCondition_FullTextOnAttributes(array $aAttCodes, $sNeedle);

	/**
	 * Perform a join, the remote class being matched by the mean of its primary key
	 *
	 * The join is performed
	 *   * from the searched class, based on the $sExtKeyAttCode attribute
	 *   * against the oFilter searched class, based on its primary key
	 * Note : if several classes have already being joined (SELECT a join b ON...), the first joined class (a in the example) is considered as being the searched class.
	 *
	 * @api
	 * @see AddCondition_ReferencedBy()
	 *
	 * @param DBObjectSearch $oFilter
	 * @param string $sExtKeyAttCode
	 * @param int $iOperatorCode the comparison operator to use. For the list of all possible values, see the constant defined in core/oql/oqlquery.class.inc.php
	 * @param array|null $aRealiasingMap array of <old-alias> => <new-alias>, for each alias that has changed in the newly attached oFilter (in case of collisions between the two filters)
	 *
	 * @throws CoreException
	 * @throws CoreWarning
	 */
	abstract public function AddCondition_PointingTo(DBObjectSearch $oFilter, $sExtKeyAttCode, $iOperatorCode = TREE_OPERATOR_EQUALS, &$aRealiasingMap = null);

	/**
	 * Inverse operation of AddCondition_PointingTo
	 *
	 * The join is performed
	 *   * from the olFilter searched class, based on the $sExtKeyAttCode attribute
	 *   * against the searched class, based on its primary key
	 * Note : if several classes have already being joined (SELECT a join b ON...), the first joined class (a in the example) is considered as being the searched class.
	 *
	 *
	 * @api
	 * @see AddCondition_PointingTo()
	 *
	 * @param DBObjectSearch $oFilter
	 * @param $sForeignExtKeyAttCode
	 * @param int $iOperatorCode
	 * @param array|null $aRealiasingMap array of <old-alias> => <new-alias>, for each alias that has changed in the newly attached oFilter (in case of collisions between the two filters)
	 */
	abstract public function AddCondition_ReferencedBy(DBObjectSearch $oFilter, $sForeignExtKeyAttCode, $iOperatorCode = TREE_OPERATOR_EQUALS, &$aRealiasingMap = null);

	/**
	 * Filter this search with another search.
	 * Initial search is unmodified.
	 * The difference with Intersect, is that an alias can be provided,
	 * the filtered class does not need to be the first joined class,
	 * it can be any class of the search.
	 *
	 * @param string $sClassAlias class being filtered
	 * @param DBSearch $oFilter Filter to apply
	 *
	 * @return DBSearch The filtered search
	 * @throws \CoreException
	 */
	abstract public function Filter($sClassAlias, DBSearch $oFilter);

	/**
	 * Filter the result
	 *
	 * The filter is performed by returning only the values in common with the given $oFilter
	 * The impact on the resulting query performance/viability can be significant.
	 * Only the first joined class can be filtered.
	 *
	 * @internal
	 *
	 * @param DBSearch $oFilter
	 *
	 * @return mixed
	 */
	abstract public function Intersect(DBSearch $oFilter);

	/**
	 * Perform a join
	 *
	 * The join is performed against $oFilter selected class using $sExtKeyAttCode of the current selected class
	 *
	 * @internal
	 *
	 * @param DBSearch   $oFilter        The join is performed against $oFilter selected class
	 * @param integer    $iDirection     can be either DBSearch::JOIN_POINTING_TO or DBSearch::JOIN_REFERENCED_BY
	 * @param string     $sExtKeyAttCode The join is performed against $sExtKeyAttCode whether it is compared against the current DBSearch or $oFilter depend of $iDirection
	 * @param integer    $iOperatorCode  See DBSearch::AddCondition_PointingTo()
	 * @param array|null $aRealiasingMap Map of aliases from the attached query, that could have been renamed by the optimization process
	 *
	 * @return DBSearch
	 * @throws CoreException
	 * @throws CoreWarning
	 */
	public function Join(DBSearch $oFilter, $iDirection, $sExtKeyAttCode, $iOperatorCode = TREE_OPERATOR_EQUALS, &$aRealiasingMap = null)
	{
		$oSourceFilter = $this->DeepClone();
		$oRet = null;

		if ($oFilter instanceof DBUnionSearch) {
			$aSearches = [];
			foreach ($oFilter->GetSearches() as $oSearch) {
				$aSearches[] = $oSourceFilter->Join($oSearch, $iDirection, $sExtKeyAttCode, $iOperatorCode, $aRealiasingMap);
			}
			$oRet = new DBUnionSearch($aSearches);
		} else {
			/** @var \DBObjectSearch $oFilter */
			if ($iDirection === static::JOIN_POINTING_TO) {
				$oSourceFilter->AddCondition_PointingTo($oFilter, $sExtKeyAttCode, $iOperatorCode, $aRealiasingMap);
			} else {
				if ($iOperatorCode !== TREE_OPERATOR_EQUALS) {
					throw new Exception('Only TREE_OPERATOR_EQUALS  operator code is supported yet for AddCondition_ReferencedBy.');
				}
				$oSourceFilter->AddCondition_ReferencedBy($oFilter, $sExtKeyAttCode, TREE_OPERATOR_EQUALS, $aRealiasingMap);
			}
			$oRet = $oSourceFilter;
		}

		return $oRet;
	}

	/**
	 * Set the internal params.
	 *
	 * If any params pre-existed, they are lost.
	 *
	 * @internal
	 *
	 * @param mixed[string] $aParams array of mixed params index by string name
	 *
	 * @return mixed
	 */
	abstract public function SetInternalParams($aParams);

	/**
	 * @internal
	 * @return mixed
	 */
	abstract public function GetInternalParams();

	/**
	 * @internal
	 *
	 * @param bool $bExcludeMagicParams
	 *
	 * @return mixed
	 */
	abstract public function GetQueryParams($bExcludeMagicParams = true);

	/**
	 * @internal
	 * @return mixed
	 */
	abstract public function ListConstantFields();

	/**
	 * Turn the parameters (:xxx) into scalar values
	 *
	 * The goal is to easily serialize a search
	 *
	 * @internal
	 *
	 * @param array $aArgs
	 *
	 * @return string
	 */
	abstract public function ApplyParameters($aArgs);

	/**
	 * Convert a query to a string representation
	 *
	 * This operation can be revert back to a DBSearch using DBSearch::unserialize()
	 *
	 * @api
	 * @see DBSearch::unserialize()
	 *
	 * @param bool  $bDevelopParams
	 * @param array $aContextParams
	 *
	 * @return false|string
	 * @throws ArchivedObjectException
	 * @throws CoreException
	 */
	public function serialize($bDevelopParams = false, $aContextParams = [])
	{
		$aQueryParams = $this->GetQueryParams();

		$aContextParams = array_merge($this->GetInternalParams(), $aContextParams);

		foreach ($aQueryParams as $sParam => $sValue) {
			if (isset($aContextParams[$sParam])) {
				$aQueryParams[$sParam] = $aContextParams[$sParam];
			} elseif (($iPos = strpos($sParam, '->')) !== false) {
				$sParamName = substr($sParam, 0, $iPos);
				if (isset($aContextParams[$sParamName.'->object()']) || isset($aContextParams[$sParamName])) {
					$sAttCode = substr($sParam, $iPos + 2);
					/** @var \DBObject $oObj */
					$oObj = isset($aContextParams[$sParamName.'->object()']) ? $aContextParams[$sParamName.'->object()'] : $aContextParams[$sParamName];
					if ($oObj->IsModified()) {
						if ($sAttCode == 'id') {
							$aQueryParams[$sParam] = $oObj->GetKey();
						} else {
							$aQueryParams[$sParam] = $oObj->Get($sAttCode);
						}
					} else {
						unset($aQueryParams[$sParam]);
						// For database objects, serialize only class, key
						$aQueryParams[$sParamName.'->id'] = $oObj->GetKey();
						$aQueryParams[$sParamName.'->class'] = get_class($oObj);
					}
				}
			}
		}

		$sOql = $this->ToOql($bDevelopParams, $aContextParams);
		return urlencode(json_encode([$sOql, $aQueryParams, $this->m_aModifierProperties]));
	}

	/**
	 * Convert a serialized query back to an instance of DBSearch
	 *
	 * @api
	 *
	 * @param string $sValue Serialized OQL query
	 *
	 * @return \DBSearch
	 * @throws \ArchivedObjectException
	 * @throws \CoreException
	 * @throws \OQLException
	 */
	public static function unserialize($sValue)
	{
		$aData = json_decode(urldecode($sValue), true);
		if (is_null($aData)) {
			throw new CoreException("Invalid filter parameter");
		}
		$sOql = $aData[0];
		$aParams = $aData[1];
		$aExtraParams = [];
		foreach ($aParams as $sParam => $sValue) {
			if (($iPos = strpos($sParam, '->class')) !== false) {
				$sParamName = substr($sParam, 0, $iPos);
				if (isset($aParams[$sParamName.'->id'])) {
					$sClass = $aParams[$sParamName.'->class'];
					$iKey = $aParams[$sParamName.'->id'];
					$oObj = MetaModel::GetObject($sClass, $iKey);
					$aExtraParams[$sParamName.'->object()'] = $oObj;
				}
			}
		}
		$aParams = array_merge($aExtraParams, $aParams);
		// We've tried to use gzcompress/gzuncompress, but for some specific queries
		// it was not working at all (See Trac #193)
		// gzuncompress was issuing a warning "data error" and the return object was null
		$oRetFilter = self::FromOQL($sOql, $aParams);
		$oRetFilter->m_aModifierProperties = $aData[2];
		return $oRetFilter;
	}

	/**
	 * Create a new DBObjectSearch from $oSearch with a new alias $sAlias
	 *
	 * @internal Note : This has not be tested with UNION queries.
	 *
	 * @param DBSearch $oSearch
	 * @param string   $sAlias
	 *
	 * @return DBObjectSearch
	 * @throws CoreException
	 */
	public static function CloneWithAlias(DBSearch $oSearch, $sAlias)
	{
		$oSearchWithAlias = new DBObjectSearch($oSearch->GetClass(), $sAlias);
		$oSearchWithAlias = $oSearchWithAlias->Intersect($oSearch);
		return $oSearchWithAlias;
	}

	/**
	 * Convert the DBSearch to an OQL representation
	 *
	 * @api
	 * @see DBSearch::FromOQL()
	 *
	 * @param bool $bDevelopParams
	 * @param null $aContextParams
	 * @param bool $bWithAllowAllFlag
	 *
	 * @return mixed
	 */
	abstract public function ToOQL($bDevelopParams = false, $aContextParams = null, $bWithAllowAllFlag = false);

	/**
	 * Export the DBSearch as a structure (array of arrays...) suitable for a conversion to JSON
	 *
	 * @internal
	 *
	 * @return mixed[string]
	 */
	abstract public function ToJSON();

	protected static $m_aOQLQueries = [];

	/**
	 * FromOQL with AllowAllData enabled
	 *
	 * The goal is to  not filter out depending on user rights.
	 * In particular when we are currently in the process of evaluating the user rights...
	 *
	 * @internal
	 * @see DBSearch::FromOQL()
	 *
	 * @param string $sQuery
	 * @param null   $aParams
	 *
	 * @return DBSearch
	 * @throws OQLException
	 */
	public static function FromOQL_AllData($sQuery, $aParams = null)
	{
		$oRes = self::FromOQL($sQuery, $aParams);
		$oRes->AllowAllData();
		return $oRes;
	}

	/**
	 * Create a new DBSearch from the given OQL.
	 *
	 * This is the simplest way to create a DBSearch.
	 * For almost every cases, this is the easiest way.
	 *
	 * @api
	 * @see DBSearch::ToOQL()
	 *
	 * @param string $sQuery The OQL to convert to a DBSearch
	 * @param array $aParams array of <mixed> params index by <string> name
	 * @param ModelReflection|null $oMetaModel The MetaModel to use when checking the consistency of the OQL
	 *
	 * @return DBObjectSearch|DBUnionSearch
	 *
	 * @throws OQLException
	 */
	public static function FromOQL($sQuery, $aParams = null, ModelReflection $oMetaModel = null)
	{
		if (empty($sQuery)) {
			return null;
		}

		// Query caching
		$sQueryId = md5($sQuery);
		$bOQLCacheEnabled = true;
		if ($bOQLCacheEnabled) {
			if (array_key_exists($sQueryId, self::$m_aOQLQueries)) {
				// hit!
				$oResultFilter = self::$m_aOQLQueries[$sQueryId]->DeepClone();
			} elseif (self::$m_bUseAPCCache) {
				// Note: For versions of APC older than 3.0.17, fetch() accepts only one parameter
				//
				$sAPCCacheId = 'itop-'.MetaModel::GetEnvironmentId().'-dbsearch-cache-'.$sQueryId;
				$oKPI = new ExecutionKPI();
				$result = apc_fetch($sAPCCacheId);
				$oKPI->ComputeStats('Search APC (fetch)', $sQuery);

				if (is_object($result)) {
					$oResultFilter = $result;
					self::$m_aOQLQueries[$sQueryId] = $oResultFilter->DeepClone();
				}
			}
		}

		/** @var DBObjectSearch | null $oResultFilter */
		if (!isset($oResultFilter)) {
			$oKPI = new ExecutionKPI();

			$oOql = new OqlInterpreter($sQuery);
			$oOqlQuery = $oOql->ParseQuery();

			if ($oMetaModel === null) {
				$oMetaModel = new ModelReflectionRuntime();
			}
			$oOqlQuery->Check($oMetaModel, $sQuery); // Exceptions thrown in case of issue

			$oResultFilter = $oOqlQuery->ToDBSearch($sQuery);

			$oKPI->ComputeStats('Parse OQL', $sQuery);

			if ($bOQLCacheEnabled) {
				self::$m_aOQLQueries[$sQueryId] = $oResultFilter->DeepClone();

				if (self::$m_bUseAPCCache) {
					$oKPI = new ExecutionKPI();
					apc_store($sAPCCacheId, $oResultFilter, self::$m_iQueryCacheTTL);
					$oKPI->ComputeStats('Search APC (store)', $sQueryId);
				}
			}
		}

		if (!is_null($aParams)) {
			$oResultFilter->SetInternalParams($aParams);
		}

		// Set the default fields
		$oResultFilter->Init();

		return $oResultFilter;
	}

	/**
	 * Fetch the result has an array structure.
	 *
	 * Alternative to object mapping: the data are transfered directly into an array
	 * This is 10 times faster than creating a set of objects, and makes sense when optimization is required
	 * But this speed comes at the cost of not obtaining the easy to manipulates DBObject instances but simple array structure.
	 *
	 * @internal
	 *
	 * @param array $aColumns The columns you'd like to fetch.
	 * @param array $aOrderBy Array of '[<classalias>.]attcode' => bAscending
	 * @param array $aArgs
	 *
	 * @return array|void
	 *
	 * @throws \CoreException
	 * @throws \MissingQueryArgument
	 * @throws \MySQLException
	 * @throws \MySQLHasGoneAwayException
	 */
	public function ToDataArray($aColumns = [], $aOrderBy = [], $aArgs = [])
	{
		$sSQL = $this->MakeSelectQuery($aOrderBy, $aArgs);
		$resQuery = CMDBSource::Query($sSQL);
		if (!$resQuery) {
			return;
		}

		if (count($aColumns) == 0) {
			$aColumns = array_keys(MetaModel::ListAttributeDefs($this->GetClass()));
			// Add the standard id (as first column)
			array_unshift($aColumns, 'id');
		}

		$aQueryCols = CMDBSource::GetColumns($resQuery, $sSQL);

		$sClassAlias = $this->GetClassAlias();
		$aColMap = [];
		foreach ($aColumns as $sAttCode) {
			$sColName = $sClassAlias.$sAttCode;
			if (in_array($sColName, $aQueryCols)) {
				$aColMap[$sAttCode] = $sColName;
			}
		}

		$aRes = [];
		while ($aRow = CMDBSource::FetchArray($resQuery)) {
			$aMappedRow = [];
			foreach ($aColMap as $sAttCode => $sColName) {
				$aMappedRow[$sAttCode] = $aRow[$sColName];
			}
			$aRes[] = $aMappedRow;
		}
		CMDBSource::FreeResult($resQuery);
		return $aRes;
	}

	/**
	 * Selects a column ($sAttCode) from the specified class ($sClassAlias - default main class) of the DBsearch object and gives the result as an array
	 * @param string $sAttCode
	 * @param string|null $sClassAlias
	 *
	 * @return array
	 * @throws ConfigException
	 * @throws CoreException
	 * @throws MissingQueryArgument
	 * @throws MySQLException
	 * @throws MySQLHasGoneAwayException
	 */
	public function SelectAttributeToArray(string $sAttCode, ?string $sClassAlias = null): array
	{
		if (is_null($sClassAlias)) {
			$sClassAlias = $this->GetClassAlias();
		}

		$sClass = $this->GetClass();
		if ($sAttCode === 'id') {
			$aAttToLoad[$sClassAlias] = [];
		} else {
			$aAttToLoad[$sClassAlias][$sAttCode] = MetaModel::GetAttributeDef($sClass, $sAttCode);
		}

		$sSQL = $this->MakeSelectQuery([], [], $aAttToLoad);
		$resQuery = CMDBSource::Query($sSQL);
		if (!$resQuery) {
			return [];
		}

		$sColName = $sClassAlias.$sAttCode;

		$aRes = [];
		while ($aRow = CMDBSource::FetchArray($resQuery)) {
			$aMappedRow = [];
			if ($sAttCode === 'id') {
				$aMappedRow[$sAttCode] = $aRow[$sColName];
			} else {
				$aMappedRow[$sAttCode] = $aAttToLoad[$sClassAlias][$sAttCode]->FromSQLToValue($aRow, $sColName);
			}
			$aRes[] = $aMappedRow;
		}
		CMDBSource::FreeResult($resQuery);
		return $aRes;
	}

	////////////////////////////////////////////////////////////////////////////
	//
	// Construction of the SQL queries
	//
	////////////////////////////////////////////////////////////////////////////
	protected static $m_aQueryStructCache = [];

	/**
	 * Generate a Group By SQL query from the current search
	 *
	 * @internal
	 *
	 * @param array $aArgs
	 * @param array $aGroupByExpr array('alias' => Expression)
	 * @param bool $bExcludeNullValues
	 * @param array $aSelectExpr array('alias' => Expression) Additional expressions added to the request
	 * @param array $aOrderBy array('alias' => bool) true = ASC false = DESC
	 * @param int $iLimitCount
	 * @param int $iLimitStart
	 *
	 * @return string SQL query generated
	 *
	 * @throws Exception
	 */
	public function MakeGroupByQuery($aArgs, $aGroupByExpr, $bExcludeNullValues = false, $aSelectExpr = [], $aOrderBy = [], $iLimitCount = 0, $iLimitStart = 0)
	{
		// Sanity check
		foreach ($aGroupByExpr as $sAlias => $oExpr) {
			if (!($oExpr instanceof Expression)) {
				throw new CoreException("Wrong parameter for 'Group By' for [$sAlias] (an array('alias' => Expression) is awaited)");
			}
		}
		foreach ($aSelectExpr as $sAlias => $oExpr) {
			if (array_key_exists($sAlias, $aGroupByExpr)) {
				throw new CoreException("Alias collision between 'Group By' and 'Select Expressions' [$sAlias]");
			}
			if (!($oExpr instanceof Expression)) {
				throw new CoreException("Wrong parameter for 'Select Expressions' for [$sAlias] (an array('alias' => Expression) is awaited)");
			}
		}
		foreach ($aOrderBy as $sAlias => $bAscending) {
			if (!array_key_exists($sAlias, $aGroupByExpr) && !array_key_exists($sAlias, $aSelectExpr) && ($sAlias != '_itop_count_')) {
				$aAllowedAliases = array_keys($aSelectExpr);
				$aAllowedAliases = array_merge($aAllowedAliases, array_keys($aGroupByExpr));
				$aAllowedAliases[] = '_itop_count_';
				throw new CoreException("Wrong alias [$sAlias] for 'Order By'. Allowed values are: ", null, implode(", ", $aAllowedAliases));
			}
			if (!is_bool($bAscending)) {
				throw new CoreException("Wrong direction in ORDER BY spec, found '$bAscending' and expecting a boolean value for '$sAlias''");
			}
		}

		if ($bExcludeNullValues) {
			// Null values are not handled (though external keys set to 0 are allowed)
			$oQueryFilter = $this->DeepClone();
			foreach ($aGroupByExpr as $oGroupByExp) {
				$oNull = new FunctionExpression('ISNULL', [$oGroupByExp]);
				$oNotNull = new BinaryExpression($oNull, '!=', new TrueExpression());
				$oQueryFilter->AddConditionExpression($oNotNull);
			}
		} else {
			$oQueryFilter = $this;
		}

		$aAttToLoad = [];
		$oSQLQuery = $oQueryFilter->GetSQLQuery([], $aArgs, $aAttToLoad, null, 0, 0, false, $aGroupByExpr, $aSelectExpr);

		$aScalarArgs = MetaModel::PrepareQueryArguments($aArgs, $this->GetInternalParams(), $this->GetExpectedArguments());
		try {
			$bBeautifulSQL = self::$m_bTraceQueries || self::$m_bDebugQuery || self::$m_bIndentQueries;
			$sRes = $oSQLQuery->RenderGroupBy($aScalarArgs, $bBeautifulSQL, $aOrderBy, $iLimitCount, $iLimitStart);
		}
		// Catch CoreException to add info before throwing again
		// Other exceptions will be thrown directly
		catch (CoreException $e) {
			// Add some information...
			$e->addInfo('OQL', $this->ToOQL());
			throw $e;
		}
		$this->AddQueryTraceGroupBy($aArgs, $aGroupByExpr, $bExcludeNullValues, $aSelectExpr, $aOrderBy, $iLimitCount, $iLimitStart, $sRes);
		return $sRes;
	}

	/**
	 * Generate a SQL query from the current search
	 *
	 * @param array $aOrderBy Array of '[<classalias>.]attcode' => bAscending
	 * @param array $aArgs
	 * @param null $aAttToLoad
	 * @param null $aExtendedDataSpec
	 * @param int $iLimitCount
	 * @param int $iLimitStart
	 * @param bool $bGetCount
	 * @param bool $bBeautifulSQL
	 *
	 * @return string
	 * @throws \ConfigException
	 * @throws \CoreException
	 * @throws \MissingQueryArgument
	 * @internal
	 *
	 */
	public function MakeSelectQuery($aOrderBy = [], $aArgs = [], $aAttToLoad = null, $aExtendedDataSpec = null, $iLimitCount = 0, $iLimitStart = 0, $bGetCount = false, $bBeautifulSQL = true)
	{
		// Check the order by specification, and prefix with the class alias
		// and make sure that the ordering columns are going to be selected
		//
		$sClass = $this->GetClass();
		$sClassAlias = $this->GetClassAlias();
		$aOrderSpec = [];
		foreach ($aOrderBy as $sFieldAlias => $bAscending) {
			if (!is_bool($bAscending)) {
				throw new CoreException("Wrong direction in ORDER BY spec, found '$bAscending' and expecting a boolean value");
			}

			$iDotPos = strpos($sFieldAlias, '.');
			if ($iDotPos === false) {
				$sAttClass = $sClass;
				$sAttClassAlias = $sClassAlias;
				$sAttCode = $sFieldAlias;
			} else {
				$sAttClassAlias = substr($sFieldAlias, 0, $iDotPos);
				$sAttClass = $this->GetClassName($sAttClassAlias);
				$sAttCode = substr($sFieldAlias, $iDotPos + 1);
			}

			if ($sAttCode != 'id') {
				MyHelpers::CheckValueInArray('field name in ORDER BY spec', $sAttCode, MetaModel::GetAttributesList($sAttClass));

				$oAttDef = MetaModel::GetAttributeDef($sAttClass, $sAttCode);
				foreach ($oAttDef->GetOrderBySQLExpressions($sAttClassAlias) as $sSQLExpression) {
					$aOrderSpec[$sSQLExpression] = $bAscending;
				}
			} else {
				$aOrderSpec['`'.$sAttClassAlias.$sAttCode.'`'] = $bAscending;
			}

			// Make sure that the columns used for sorting are present in the loaded columns
			if (!is_null($aAttToLoad) && !isset($aAttToLoad[$sAttClassAlias][$sAttCode])) {
				$aAttToLoad[$sAttClassAlias][$sAttCode] = MetaModel::GetAttributeDef($sAttClass, $sAttCode);
			}
		}

		$oSQLQuery = $this->GetSQLQuery($aOrderBy, $aArgs, $aAttToLoad, $aExtendedDataSpec, $iLimitCount, $iLimitStart, $bGetCount);

		if ($this->m_bNoContextParameters) {
			// Only internal parameters
			$aScalarArgs = $this->GetInternalParams();
		} else {
			// The complete list of arguments will include magic arguments (e.g. current_user->attcode)
			$aScalarArgs = MetaModel::PrepareQueryArguments($aArgs, $this->GetInternalParams(), $this->GetExpectedArguments());
		}
		try {
			$sRes = $oSQLQuery->RenderSelect($aOrderSpec, $aScalarArgs, $iLimitCount, $iLimitStart, $bGetCount, $bBeautifulSQL);
			if ($sClassAlias == '_itop_') {
				IssueLog::Info('SQL Query (_itop_): '.$sRes);
			}
		} catch (MissingQueryArgument $e) {
			// Add some information...
			$e->addInfo('OQL', $this->ToOQL());
			throw $e;
		}
		$this->AddQueryTraceSelect($oSQLQuery->GetSourceOQL(), $aOrderBy, $aScalarArgs, $aAttToLoad, $aExtendedDataSpec, $iLimitCount, $iLimitStart, $bGetCount, $sRes);
		return $sRes;
	}

	/**
	 * @param bool $bMustHaveOneResultMax if true will throw a CoreOqlMultipleResultsFound if multiple results
	 * @param array $aOrderBy
	 * @param array $aSearchParams
	 *
	 * @return null|\DBObject query result
	 * @throws \CoreOqlMultipleResultsForbiddenException if multiple results found and parameter enforce the check
	 * @throws \CoreException
	 * @throws \CoreUnexpectedValue
	 * @throws \MySQLException
	 *
	 * @since 2.7.0 N°2555
	 */
	public function GetFirstResult($bMustHaveOneResultMax = true, $aOrderBy = [], $aSearchParams = [])
	{
		$oSet = new DBObjectSet($this, [], $aSearchParams, null, 2);
		$oFirstResult = $oSet->Fetch();
		if ($oFirstResult === null) { // useless but here for readability ;)
			return null;
		}

		if ($bMustHaveOneResultMax) {
			$oSecondResult = $oSet->Fetch();
			if ($oSecondResult !== null) {
				throw new CoreOqlMultipleResultsForbiddenException(
					'Search returned multiple results, this is forbidden. Query was: '.$this->ToOQL()
				);
			}
		}

		return $oFirstResult;
	}

	/**
	 * @internal
	 * @return mixed
	 */
	abstract protected function IsDataFiltered();

	/**
	 * @internal
	 * @return mixed
	 */
	abstract protected function SetDataFiltered();

	/**
	 * @param      $aOrderBy
	 * @param      $aArgs
	 * @param      $aAttToLoad
	 * @param      $aExtendedDataSpec
	 * @param      $iLimitCount
	 * @param      $iLimitStart
	 * @param      $bGetCount
	 * @param null $aGroupByExpr
	 * @param null $aSelectExpr
	 *
	 * @return SQLObjectQuery
	 * @throws \CoreException
	 * @internal
	 *
	 */
	protected function GetSQLQuery($aOrderBy, $aArgs, $aAttToLoad, $aExtendedDataSpec, $iLimitCount, $iLimitStart, $bGetCount, $aGroupByExpr = null, $aSelectExpr = null)
	{
		$oSearch = $this;
		if (!$this->IsAllDataAllowed() && !$this->IsDataFiltered()) {
			foreach ($this->GetSelectedClasses() as $sClassAlias => $sClass) {
				$oVisibleObjects = UserRights::GetSelectFilter($sClass, $this->GetModifierProperties('UserRightsGetSelectFilter'));
				if ($oVisibleObjects === false) {
					// Make sure this is a valid search object, saying NO for all
					$oVisibleObjects = DBObjectSearch::FromEmptySet($sClass);
				}
				if (is_object($oVisibleObjects)) {
					$oVisibleObjects->AllowAllData();
					$oSearch = $oSearch->Filter($sClassAlias, $oVisibleObjects);
					$oSearch->SetDataFiltered();
				}
			}
		}

		if (is_array($aGroupByExpr)) {
			foreach ($aGroupByExpr as $sAlias => $oGroupByExp) {
				/** @var \Expression $oGroupByExp */

				$aFields = $oGroupByExp->ListRequiredFields();
				foreach ($aFields as $sFieldAlias) {
					$aMatches = [];
					if (preg_match('/^([^.]+)\\.([^.]+)$/', $sFieldAlias, $aMatches)) {
						$sFieldClass = $this->GetClassName($aMatches[1]);
						$oAttDef = MetaModel::GetAttributeDef($sFieldClass, $aMatches[2]);
						if ($oAttDef instanceof iAttributeNoGroupBy) {
							throw new Exception("Grouping on '$sFieldClass' fields is not supported.");
						}
					}
				}
			}
		}

		$oSQLQuery = $oSearch->GetSQLQueryStructure($aAttToLoad, $bGetCount, $aGroupByExpr, null, $aSelectExpr);
		$oSQLQuery->SetSourceOQL($oSearch->ToOQL());

		// Join to an additional table, if required...
		//
		if ($aExtendedDataSpec != null) {
			$sTableAlias = '_extended_data_';
			$aExtendedFields = [];
			foreach ($aExtendedDataSpec['fields'] as $sColumn) {
				$sColRef = $this->GetClassAlias().'_extdata_'.$sColumn;
				$aExtendedFields[$sColRef] = new FieldExpressionResolved($sColumn, $sTableAlias);
			}
			$oSQLQueryExt = new SQLObjectQuery($aExtendedDataSpec['table'], $sTableAlias, $aExtendedFields);
			$oSQLQuery->AddInnerJoin($oSQLQueryExt, 'id', $aExtendedDataSpec['join_key'] /*, $sTableAlias*/);
		}

		return $oSQLQuery;
	}

	/**
	 * @internal
	 *
	 * @param      $aAttToLoad
	 * @param      $bGetCount
	 * @param null $aGroupByExpr
	 * @param null $aSelectedClasses
	 * @param null $aSelectExpr
	 *
	 * @return mixed
	 */
	abstract public function GetSQLQueryStructure(
		$aAttToLoad,
		$bGetCount,
		$aGroupByExpr = null,
		$aSelectedClasses = null,
		$aSelectExpr = null
	);

	/**
	 * Shortcut to add efficient IN condition
	 *
	 * @internal
	 *
	 * @param      $sFilterCode
	 * @param      $aValues
	 * @param bool $bPositiveMatch if true a `IN` is performed, if false, a `NOT IN` is performed
	 *
	 * @return mixed
	 */
	abstract public function AddConditionForInOperatorUsingParam($sFilterCode, $aValues, $bPositiveMatch = true);

	/**
	 * @internal
	 * @return string a unique param name
	 */
	protected function GenerateUniqueParamName()
	{
		return str_replace('.', '', 'param_'.microtime(true).rand(0, 100));
	}

	////////////////////////////////////////////////////////////////////////////
	//
	// Cache/Trace/Log queries
	//
	////////////////////////////////////////////////////////////////////////////
	protected static $m_bDebugQuery = false;
	protected static $m_aQueriesLog = [];
	protected static $m_bQueryCacheEnabled = false;
	protected static $m_bUseAPCCache = false;
	protected static $m_iQueryCacheTTL = 3600;
	protected static $m_bTraceQueries = false;
	protected static $m_bIndentQueries = false;
	protected static $m_bOptimizeQueries = false;

	/**
	 * @internal
	 */
	public static function StartDebugQuery()
	{
		$aBacktrace = debug_backtrace();
		self::$m_bDebugQuery = true;
	}

	/**
	 * @internal
	 */
	public static function StopDebugQuery()
	{
		self::$m_bDebugQuery = false;
	}

	/**
	 * @internal
	 *
	 * @param bool $bEnabled
	 * @param bool $bUseAPC
	 * @param int  $iTimeToLive
	 */
	public static function EnableQueryCache($bEnabled, $bUseAPC, $iTimeToLive = 3600)
	{
		self::$m_bQueryCacheEnabled = $bEnabled;
		self::$m_bUseAPCCache = $bUseAPC;
		self::$m_iQueryCacheTTL = $iTimeToLive;
	}

	/**
	 * @internal
	 * @param $bEnabled
	 */
	public static function EnableQueryTrace($bEnabled)
	{
		self::$m_bTraceQueries = $bEnabled;
	}

	/**
	 * @internal
	 * @param $bEnabled
	 */
	public static function EnableQueryIndentation($bEnabled)
	{
		self::$m_bIndentQueries = $bEnabled;
	}

	/**
	 * @internal
	 * @param $bEnabled
	 */
	public static function EnableOptimizeQuery($bEnabled)
	{
		self::$m_bOptimizeQueries = $bEnabled;
	}

	/**
	 * @param $sOql
	 * @param $aOrderBy
	 * @param $aArgs
	 * @param $aAttToLoad
	 * @param $aExtendedDataSpec
	 * @param $iLimitCount
	 * @param $iLimitStart
	 * @param $bGetCount
	 * @param $sSql
	 *
	 * @throws \ConfigException
	 * @throws \CoreException
	 * @internal
	 *
	 */
	protected function AddQueryTraceSelect($sOql, $aOrderBy, $aArgs, $aAttToLoad, $aExtendedDataSpec, $iLimitCount, $iLimitStart, $bGetCount, $sSql)
	{
		if (self::$m_bTraceQueries) {
			$aQueryData = [
				'type' => 'select',
				'order_by' => $aOrderBy,
				'att_to_load' => $aAttToLoad,
				'limit_count' => $iLimitCount,
				'limit_start' => $iLimitStart,
				'is_count' => $bGetCount,
			];

			DBSearch::EnableQueryTrace(false);
			$aQueryData['oql'] = $this->ToOQL(true, $aArgs);
			DBSearch::EnableQueryTrace(true);

			if (!empty($aAttToLoad)) {
				$aAttToLoadNames = [];
				foreach ($aAttToLoad as $sClass => $aAttributes) {
					$aAttToLoadNames[$sClass] = [];
					foreach ($aAttributes as $sAttCode => $oAttDef) {
						$aAttToLoadNames[$sClass][] = $sAttCode;
					}
				}
			} else {
				$aAttToLoadNames = null;
			}
			$aQueryData['att_to_load'] = $aAttToLoadNames;

			$hLogFile = @fopen(APPROOT.'log/oql_records.txt', 'a');
			if ($hLogFile !== false) {
				flock($hLogFile, LOCK_EX);
				fwrite($hLogFile, serialize($aQueryData)."\n");
				fflush($hLogFile);
				flock($hLogFile, LOCK_UN);
				fclose($hLogFile);
			}
		}
	}

	/**
	 * @param $aArgs
	 * @param $aGroupByExpr
	 * @param $bExcludeNullValues
	 * @param $aSelectExpr
	 * @param $aOrderBy
	 * @param $iLimitCount
	 * @param $iLimitStart
	 * @param $sSql
	 *
	 * @throws \ConfigException
	 * @throws \CoreException
	 * @throws \MySQLException
	 * @internal
	 *
	 */
	protected function AddQueryTraceGroupBy($aArgs, $aGroupByExpr, $bExcludeNullValues, $aSelectExpr, $aOrderBy, $iLimitCount, $iLimitStart, $sSql)
	{
		if (self::$m_bTraceQueries) {
			$aQueryData = [
				'type' => 'group_by',
				'order_by' => $aOrderBy,
				'group_by_expr' => $aGroupByExpr,
				'exclude_null_values' => $bExcludeNullValues,
				'select_expr' => $aSelectExpr,
				'limit_count' => $iLimitCount,
				'limit_start' => $iLimitStart,
			];

			$aQueryData['oql'] = $this->ToOQL(true, $aArgs);
			$aQueryData['group_by_expr'] = Expression::ConvertArrayToOQL($aQueryData['group_by_expr'], $aArgs);
			$aQueryData['select_expr'] = Expression::ConvertArrayToOQL($aQueryData['select_expr'], $aArgs);

			$hLogFile = @fopen(APPROOT.'log/oql_group_by_records.txt', 'a');
			if ($hLogFile !== false) {
				flock($hLogFile, LOCK_EX);
				fwrite($hLogFile, serialize($aQueryData)."\n");
				fflush($hLogFile);
				flock($hLogFile, LOCK_UN);
				fclose($hLogFile);
			}
		}
	}

	/**
	 * @internal
	 *
	 * @param $aQueryData
	 * @param $sOql
	 * @param $sSql
	 *
	 * @throws MySQLException
	 */
	protected static function AddQueryTrace($aQueryData, $sOql, $sSql)
	{
		if (self::$m_bTraceQueries) {
			$sQueryId = md5(serialize($aQueryData));
			$sMySQLQueryId = md5($sSql);
			if (!isset(self::$m_aQueriesLog[$sQueryId])) {
				self::$m_aQueriesLog[$sQueryId]['data'] = serialize($aQueryData);
				self::$m_aQueriesLog[$sQueryId]['oql'] = $sOql;
				self::$m_aQueriesLog[$sQueryId]['hits'] = 1;
			} else {
				self::$m_aQueriesLog[$sQueryId]['hits']++;
			}
			if (!isset(self::$m_aQueriesLog[$sQueryId]['queries'][$sMySQLQueryId])) {
				self::$m_aQueriesLog[$sQueryId]['queries'][$sMySQLQueryId]['sql'] = $sSql;
				self::$m_aQueriesLog[$sQueryId]['queries'][$sMySQLQueryId]['count'] = 1;
				$iTableCount = count(CMDBSource::ExplainQuery($sSql));
				self::$m_aQueriesLog[$sQueryId]['queries'][$sMySQLQueryId]['table_count'] = $iTableCount;
			} else {
				self::$m_aQueriesLog[$sQueryId]['queries'][$sMySQLQueryId]['count']++;
			}
		}
	}

	/**
	 * @internal
	 */
	public static function RecordQueryTrace()
	{
		if (!self::$m_bTraceQueries) {
			return;
		}

		$iOqlCount = count(self::$m_aQueriesLog);
		$iSqlCount = 0;
		foreach (self::$m_aQueriesLog as $sQueryId => $aOqlData) {
			$iSqlCount += $aOqlData['hits'];
		}
		$sHtml = "<h2>Stats on SELECT queries: OQL=$iOqlCount, SQL=$iSqlCount</h2>\n";
		foreach (self::$m_aQueriesLog as $sQueryId => $aOqlData) {
			$sOql = $aOqlData['oql'];
			$sHits = $aOqlData['hits'];

			$sHtml .= "<p><b>$sHits</b> hits for OQL query: $sOql</p>\n";
			$sHtml .= "<ul id=\"ClassesRelationships\" class=\"treeview\">\n";
			foreach ($aOqlData['queries'] as $aSqlData) {
				$sQuery = $aSqlData['sql'];
				$sSqlHits = $aSqlData['count'];
				$iTableCount = $aSqlData['table_count'];
				$sHtml .= "<li><b>$sSqlHits</b> hits for SQL ($iTableCount tables): <pre style=\"font-size:60%\">$sQuery</pre></li>\n";
			}
			$sHtml .= "</ul>\n";
		}

		$sLogFile = 'queries.latest';
		file_put_contents(APPROOT.'data/'.$sLogFile.'.html', $sHtml);

		$sLog = "<?php\n\$aQueriesLog = ".var_export(self::$m_aQueriesLog, true).";";
		file_put_contents(APPROOT.'data/'.$sLogFile.'.log', $sLog);

		// Cumulate the queries
		$sAllQueries = APPROOT.'data/queries.log';
		if (file_exists($sAllQueries)) {
			// Merge the new queries into the existing log
			include($sAllQueries);
			$aQueriesLog = [];
			foreach (self::$m_aQueriesLog as $sQueryId => $aOqlData) {
				if (!array_key_exists($sQueryId, $aQueriesLog)) {
					$aQueriesLog[$sQueryId] = $aOqlData;
				}
			}
		} else {
			$aQueriesLog = self::$m_aQueriesLog;
		}
		$sLog = "<?php\n\$aQueriesLog = ".var_export($aQueriesLog, true).";";
		file_put_contents($sAllQueries, $sLog);
	}

	/**
	 * @internal
	 * @param $value
	 */
	protected static function DbgTrace($value)
	{
		if (!self::$m_bDebugQuery) {
			return;
		}
		$aBacktrace = debug_backtrace();
		$iCallStackPos = count($aBacktrace) - self::$m_bDebugQuery;
		$sIndent = "";
		for ($i = 0 ; $i < $iCallStackPos ; $i++) {
			$sIndent .= " .-=^=-. ";
		}
		$aCallers = [];
		foreach ($aBacktrace as $aStackInfo) {
			$aCallers[] = $aStackInfo["function"];
		}
		$sCallers = "Callstack: ".implode(', ', $aCallers);
		$sFunction = "<b title=\"$sCallers\">".$aBacktrace[1]["function"]."</b>";

		if (is_object($value)) {
			echo "$sIndent$sFunction:\n<pre>\n";
			print_r($value);
			echo "</pre>\n";
		} else {
			echo "$sIndent$sFunction: $value<br/>\n";
		}
	}

	/**
	 * Updates archive_flag and archive_date fields in the whole class hierarchy
	 *
	 * @see \DBObject::DBWriteArchiveFlag()
	 *
	 * @param boolean $bArchive
	 *
	 * @throws Exception
	 * @todo implement the change tracking
	 */
	public function DBBulkWriteArchiveFlag($bArchive)
	{
		$sClass = $this->GetClass();
		if (!MetaModel::IsArchivable($sClass)) {
			throw new Exception($sClass.' is not an archivable class');
		}

		$iFlag = $bArchive ? 1 : 0;

		$oSet = new DBObjectSet($this);
		if (MetaModel::IsStandaloneClass($sClass)) {
			$oSet->OptimizeColumnLoad([$this->GetClassAlias() => []]);
			$aIds = [$sClass => $oSet->GetColumnAsArray('id')];
		} else {
			$oSet->OptimizeColumnLoad([$this->GetClassAlias() => ['finalclass']]);
			$aTemp = $oSet->GetColumnAsArray('finalclass');
			$aIds = [];
			foreach ($aTemp as $iObjectId => $sObjectClass) {
				$aIds[$sObjectClass][$iObjectId] = $iObjectId;
			}
		}
		foreach ($aIds as $sFinalClass => $aObjectIds) {
			$sIds = implode(', ', $aObjectIds);

			$sArchiveRoot = MetaModel::GetAttributeOrigin($sFinalClass, 'archive_flag');
			$sRootTable = MetaModel::DBGetTable($sArchiveRoot);
			$sRootKey = MetaModel::DBGetKey($sArchiveRoot);
			$aJoins = ["`$sRootTable`"];
			$aUpdates = [];
			foreach (MetaModel::EnumParentClasses($sFinalClass, ENUM_PARENT_CLASSES_ALL) as $sParentClass) {
				if (!MetaModel::IsValidAttCode($sParentClass, 'archive_flag')) {
					continue;
				}

				$sTable = MetaModel::DBGetTable($sParentClass);
				$aUpdates[] = "`$sTable`.`archive_flag` = $iFlag";
				if ($sParentClass == $sArchiveRoot) {
					if ($bArchive) {
						// Set the date (do not change it)
						$sDate = '"'.date(AttributeDate::GetSQLFormat()).'"';
						$aUpdates[] = "`$sTable`.`archive_date` = coalesce(`$sTable`.`archive_date`, $sDate)";
					} else {
						// Reset the date
						$aUpdates[] = "`$sTable`.`archive_date` = null";
					}
				} else {
					$sKey = MetaModel::DBGetKey($sParentClass);
					$aJoins[] = "`$sTable` ON `$sTable`.`$sKey` = `$sRootTable`.`$sRootKey`";
				}
			}
			$sJoins = implode(' INNER JOIN ', $aJoins);
			$sValues = implode(', ', $aUpdates);
			$sUpdateQuery = "UPDATE $sJoins SET $sValues WHERE `$sRootTable`.`$sRootKey` IN ($sIds)";
			CMDBSource::Query($sUpdateQuery);
		}
	}

	/**
	 * @internal
	 */
	public function UpdateContextFromUser()
	{
		$this->SetShowObsoleteData(utils::ShowObsoleteData());
	}

	/**
	 * To ease the debug of filters
	 * @internal
	 *
	 * @return string
	 *
	 */
	public function __toString()
	{
		return $this->ToOQL(true);
	}

	/**
	 * @return array{\VariableExpression}
	 *
	 * @deprecated use DBSearch::GetExpectedArguments() instead
	 */
	public function ListParameters(): array
	{
		return $this->GetExpectedArguments();
	}

	/**
	 * Get parameters from the condition expression(s)
	 *
	 * @return array{\VariableExpression}
	 */
	abstract public function GetExpectedArguments(): array;
}