/**
* Returns the number of rows that the given query will return.
*
* @param array $arSql Array with sql parts and at least keys
* 'from' and 'where' set.
* @return int Number of rows returned.
*/
protected function getCount($arSql)
{
$sql = SparqlEngineDb_SqlMerger::getCount($this->query, $arSql);
$dbResult = $this->dbConn->execute($sql);
$nCount = 0;
foreach ($dbResult as $row) {
$nCount = intval($row[0]);
break;
}
return $nCount;
}
/**
* Sends the sql to the database and returns the results.
*
* @internal Switches between ADOConnection::Execute() and
* ADOConnection::SelectLimit() depending on the $query parameter's
* $solutionModifier "limit" and "offset" settings.
* Uses $query variable.
*
* @param array $arSql Array that gets a SQL query string once imploded
*
* @return mixed Anything ADOConnection::Execute() may return
* @throws Exception If Database query does not work
*/
function queryDb($arSql, $nOffset, $nLimit)
{
$strSql = SparqlEngineDb_SqlMerger::getSelect($this->query, $arSql);
if ($strSql == '()') {
return new ADORecordSet(false);
}
// I want associative arrays.
$oldmode = $this->dbConn->SetFetchMode(ADODB_FETCH_ASSOC);
if (isset($GLOBALS['debugSparql']) && $GLOBALS['debugSparql']) {
echo 'SQL query: ' . $strSql . "\n";
}
if ($nLimit === null && $nOffset == 0) {
$ret = $this->dbConn->execute($strSql);
} else {
if ($nLimit === null) {
$ret = $this->dbConn->SelectLimit($strSql, -1, $nOffset);
} else {
$ret = $this->dbConn->SelectLimit($strSql, $nLimit, $nOffset);
}
}
//... but others maybe not
$this->dbConn->SetFetchMode($oldmode);
if (!$ret) {
//Error occured
throw new Exception('ADOdb error: ' . $this->dbConn->ErrorMsg() . "\n" . $strSql);
}
return $ret;
}