Fix handling host and port configuration in sqlsrv and pdo_sqlsrv drivers

lib/Doctrine/DBAL/Driver/AbstractSQLServerDriver/PortWithoutHost.php

+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\DBAL\Driver\AbstractSQLServerDriver;
+
+use Doctrine\DBAL\Driver\AbstractDriverException;
+
+/**
+ * @internal
+ *
+ * @psalm-immutable
+ */
+final class PortWithoutHost extends AbstractDriverException
+{
+    public static function new() : self
+    {
+        return new self('Connection port specified without the host');
+    }
+}

lib/Doctrine/DBAL/Driver/PDOSqlsrv/Driver.php

@@ -3,6 +3,7 @@
 namespace Doctrine\DBAL\Driver\PDOSqlsrv;
 
 use Doctrine\DBAL\Driver\AbstractSQLServerDriver;
+use Doctrine\DBAL\Driver\AbstractSQLServerDriver\PortWithoutHost;
 use function is_int;
 use function sprintf;
 
@@ -48,10 +49,12 @@ class Driver extends AbstractSQLServerDriver
 
         if (isset($params['host'])) {
             $dsn .= $params['host'];
-        }
 
-        if (isset($params['port']) && ! empty($params['port'])) {
-            $dsn .= ',' . $params['port'];
+            if (isset($params['port'])) {
+                $dsn .= ',' . $params['port'];
+            }
+        } elseif (isset($params['port'])) {
+            throw PortWithoutHost::new();
         }
 
         if (isset($params['dbname'])) {

lib/Doctrine/DBAL/Driver/SQLSrv/Driver.php

@@ -3,6 +3,7 @@
 namespace Doctrine\DBAL\Driver\SQLSrv;
 
 use Doctrine\DBAL\Driver\AbstractSQLServerDriver;
+use Doctrine\DBAL\Driver\AbstractSQLServerDriver\PortWithoutHost;
 
 /**
  * Driver for ext/sqlsrv.
@@ -14,13 +15,16 @@ class Driver extends AbstractSQLServerDriver
      */
     public function connect(array $params, $username = null, $password = null, array $driverOptions = [])
     {
-        if (! isset($params['host'])) {
-            throw new SQLSrvException("Missing 'host' in configuration for sqlsrv driver.");
-        }
+        $serverName = '';
+
+        if (isset($params['host'])) {
+            $serverName = $params['host'];
 
-        $serverName = $params['host'];
-        if (isset($params['port'])) {
-            $serverName .= ', ' . $params['port'];
+            if (isset($params['port'])) {
+                $serverName .= ',' . $params['port'];
+            }
+        } elseif (isset($params['port'])) {
+            throw PortWithoutHost::new();
         }
 
         if (isset($params['dbname'])) {

tests/Doctrine/Tests/DBAL/Driver/AbstractSQLServerDriverTest.php

@@ -3,8 +3,7 @@
 namespace Doctrine\Tests\DBAL\Driver;
 
 use Doctrine\DBAL\Connection;
-use Doctrine\DBAL\Driver;
-use Doctrine\DBAL\Driver\AbstractSQLServerDriver;
+use Doctrine\DBAL\Driver\AbstractSQLServerDriver\PortWithoutHost;
 use Doctrine\DBAL\Platforms\AbstractPlatform;
 use Doctrine\DBAL\Platforms\SQLServer2005Platform;
 use Doctrine\DBAL\Platforms\SQLServer2008Platform;
@@ -13,13 +12,8 @@ use Doctrine\DBAL\Platforms\SQLServerPlatform;
 use Doctrine\DBAL\Schema\AbstractSchemaManager;
 use Doctrine\DBAL\Schema\SQLServerSchemaManager;
 
-class AbstractSQLServerDriverTest extends AbstractDriverTest
+abstract class AbstractSQLServerDriverTest extends AbstractDriverTest
 {
-    protected function createDriver() : Driver
-    {
-        return $this->getMockForAbstractClass(AbstractSQLServerDriver::class);
-    }
-
     protected function createPlatform() : AbstractPlatform
     {
         return new SQLServer2008Platform();
@@ -64,4 +58,10 @@ class AbstractSQLServerDriverTest extends AbstractDriverTest
             ['12', SQLServer2012Platform::class],
         ];
     }
+
+    public function testPortWithoutHost() : void
+    {
+        $this->expectException(PortWithoutHost::class);
+        $this->driver->connect(['port' => 1433]);
+    }
 }