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Sqlsrv driver: support for limit and offset on MS SQL server. #73

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Sqlsrv driver: support for limit and offset on MS SQL server. #73

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24 changes: 17 additions & 7 deletions src/Database/Drivers/SqlsrvDriver.php
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Original file line number Diff line number Diff line change
Expand Up @@ -18,10 +18,13 @@ class SqlsrvDriver extends Nette\Object implements Nette\Database\ISupplementalD
/** @var Nette\Database\Connection */
private $connection;

/** @var string */
private $version;

public function __construct(Nette\Database\Connection $connection, array $options)
{
$this->connection = $connection;
$this->version = $connection->getPdo()->getAttribute(\PDO::ATTR_SERVER_VERSION);
}


Expand Down Expand Up @@ -88,15 +91,22 @@ public function formatLike($value, $pos)
*/
public function applyLimit(& $sql, $limit, $offset)
{
if ($limit >= 0) {
$sql = preg_replace('#^\s*(SELECT(\s+DISTINCT|\s+ALL)?|UPDATE|DELETE)#i', '$0 TOP ' . (int) $limit, $sql, 1, $count);
if (!$count) {
throw new Nette\InvalidArgumentException('SQL query must begin with SELECT, UPDATE or DELETE command.');
if (version_compare($this->version, 11, '<')) { // 11 == SQL Server 2012
if ($limit >= 0) {
$sql = preg_replace('#^\s*(SELECT(\s+DISTINCT|\s+ALL)?|UPDATE|DELETE)#i', '$0 TOP ' . (int) $limit, $sql, 1, $count);
if (!$count) {
throw new Nette\InvalidArgumentException('SQL query must begin with SELECT, UPDATE or DELETE command.');
}
}
}

if ($offset > 0) {
throw new Nette\NotSupportedException('Offset is not supported by this database.');
if ($offset > 0) {
throw new Nette\NotSupportedException('Offset is not supported by this database.');
}
} else {
if ($limit > 0 || $offset >= 0) {
$sql .= ' OFFSET ' . (int) $offset . ' ROWS '
. 'FETCH NEXT ' . (int) $limit . ' ROWS ONLY';
}
}
}

Expand Down