Fixed AppVeyor build configuration and the issue on SQL Server

.appveyor.yml

@@ -131,17 +131,25 @@ before_test:
       }
 
 test_script:
-  - cd C:\projects\dbal
   - ps: >-
       if ($env:db_version) {
         $env:phpunit_config = "tests\appveyor\$($env:db).$($env:db_version).$($env:driver).appveyor.xml"
       } else {
         $env:phpunit_config = "tests\appveyor\$($env:db).$($env:driver).appveyor.xml"
       }
-  - ps: >-
+
       if ($env:coverage -eq "yes") {
         vendor\bin\phpunit -c $($env:phpunit_config) --coverage-clover clover.xml
-        appveyor-retry ocular code-coverage:upload --format=php-clover clover.xml
       } else {
         vendor\bin\phpunit -c $($env:phpunit_config)
       }
+
+      if ($LastExitCode -ne 0) {
+        $host.SetShouldExit($LastExitCode)
+      }
+
+after_test:
+  - ps: >-
+      if ($env:coverage -eq "yes") {
+        appveyor-retry ocular code-coverage:upload --format=php-clover clover.xml
+      }

lib/Doctrine/DBAL/Platforms/SQLServerPlatform.php

@@ -1278,7 +1278,7 @@ protected function doModifyLimitQuery($query, $limit, $offset = null)
         // Even if the TOP n is very large, the use of a CTE will
         // allow the SQL Server query planner to optimize it so it doesn't
         // actually scan the entire range covered by the TOP clause.
-        if (! preg_match('/^(\s*SELECT\s+(?:DISTINCT\s+)?)(.*)$/im', $query, $matches)) {
+        if (! preg_match('/^(\s*SELECT\s+(?:DISTINCT\s+)?)(.*)$/is', $query, $matches)) {
             return $query;
         }