DibiPdoDriver: added support for MsSql2012 Offset

Since MsSql2012 allow using of OFFSET, I added this option to the driver for PDO. Driver will automaticly recognize this is proper version and use the new offset.

dibi/drivers/DibiPdoDriver.php

@@ -38,6 +38,9 @@ class DibiPdoDriver extends DibiObject implements IDibiDriver, IDibiResultDriver
 	/** @var string */
 	private $driverName;
 
+	/** @var string */
+	private $serverVersion;
+
 
 	/**
 	 * @throws DibiNotSupportedException
@@ -75,6 +78,7 @@ class DibiPdoDriver extends DibiObject implements IDibiDriver, IDibiResultDriver
 		}
 
 		$this->driverName = $this->connection->getAttribute(PDO::ATTR_DRIVER_NAME);
+		$this->serverVersion = $this->connection->getAttribute(PDO::ATTR_SERVER_VERSION);
 	}
 
 
@@ -396,10 +400,19 @@ class DibiPdoDriver extends DibiObject implements IDibiDriver, IDibiResultDriver
 				}
 				break;
 
-			case 'odbc':
-			case 'dblib':
 			case 'mssql':
 			case 'sqlsrv':
+			case 'dblib':
+				if (version_compare($this->serverVersion, '11.0') >= 0) {
+					if ($offset >= 0 || $limit >= 0) {
+						$sql .= ' OFFSET ' . (int) $offset . ' ROWS'
+							. ($limit > 0 ? ' FETCH NEXT ' . (int) $limit . ' ROWS ONLY' : '');
+					}
+					break;
+				}
+				// intentionally break omitted
+
+			case 'odbc':
 				if ($offset < 1) {
 					$sql = 'SELECT TOP ' . (int) $limit . ' * FROM (' . $sql . ') t';
 					break;

tests/dibi/PdoMssql.limits.phpt

@@ -0,0 +1,80 @@
+<?php
+
+/**
+ * @dataProvider ../databases.ini
+ */
+
+use Tester\Assert;
+
+require __DIR__ . '/bootstrap.php';
+
+if ($config['system'] !== 'mssql' || $config['driver'] !== 'pdo') {
+	Tester\Environment::skip("Not supported system '$config[system]'.");
+}
+
+$tests = function($conn){
+	$version = $conn->getDriver()->getResource()->getAttribute(PDO::ATTR_SERVER_VERSION);
+
+	// MsSQL2012+
+	if(version_compare($version, '11.0') >= 0) {
+		// Limit and offset
+		Assert::same(
+			'SELECT 1 OFFSET 10 ROWS FETCH NEXT 10 ROWS ONLY',
+			$conn->translate('SELECT 1 %ofs %lmt', 10, 10)
+		);
+
+		// Limit only
+		Assert::same(
+			'SELECT 1 OFFSET 0 ROWS FETCH NEXT 10 ROWS ONLY',
+			$conn->translate('SELECT 1 %lmt', 10)
+		);
+
+		// Offset only
+		Assert::same(
+			'SELECT 1 OFFSET 10 ROWS',
+			$conn->translate('SELECT 1 %ofs', 10)
+		);
+
+		// Offset invalid
+		Assert::same(
+			'SELECT 1',
+			$conn->translate('SELECT 1 %ofs', -10)
+		);
+
+		// Limit invalid
+		Assert::same(
+			'SELECT 1',
+			$conn->translate('SELECT 1 %lmt', -10)
+		);
+
+		// Limit invalid, offset valid
+		Assert::same(
+			'SELECT 1',
+			$conn->translate('SELECT 1 %ofs %lmt', 10, -10)
+		);
+
+		// Limit valid, offset invalid
+		Assert::same(
+			'SELECT 1',
+			$conn->translate('SELECT 1 %ofs %lmt', -10, 10)
+		);
+	} else {
+		Assert::same(
+			'SELECT TOP 1 * FROM (SELECT 1) t',
+			$conn->translate('SELECT 1 %lmt', 1)
+		);
+
+		Assert::same(
+			'SELECT 1',
+			$conn->translate('SELECT 1 %lmt', -10)
+		);
+
+		Assert::exception(
+			$conn->translate('SELECT 1 %ofs %lmt', 10, 10),
+			'DibiNotSupportedException'
+		);
+	}
+};
+
+$conn = new DibiConnection($config);
+$tests($conn);