Drop support for MySQL 5.6 and older

.github/workflows/continuous-integration.yml

@@ -205,8 +205,7 @@ jobs:
         php-version:
           - "8.0"
         mariadb-version:
-          - "10.0"
-          - "10.2"
+          - "10.3"
           - "10.5"
         extension:
           - "mysqli"

UPGRADE.md

@@ -8,6 +8,14 @@ awareness about deprecated code.
 
 # Upgrade to 4.0
 
+## BC BREAK: Removed support for MySQL 5.6 and older
+
+MySQL 5.6 and older are not supported anymore. The following classes have been merged into their respective
+parent classes:
+
+* `Doctrine\DBAL\Platforms\MySQL57Platform`
+* `Doctrine\DBAL\Platforms\Keywords\MySQL57Keywords`
+
 ## BC BREAK: Removed active support for Postgres 9
 
 Postgres 9 is not actively supported anymore. The following classes have been merged into their respective parent class:

docs/en/reference/platforms.rst

@@ -33,8 +33,7 @@ can be found as follows:
 MySQL
 ^^^^^
 
--  ``MySQLPlatform`` for version 5.0 and above.
--  ``MySQL57Platform`` for version 5.7 (5.7.9 GA) and above.
+-  ``MySQLPlatform`` for version 5.7 (5.7.9 GA) and above.
 -  ``MySQL80Platform`` for version 8.0 (8.0 GA) and above.
 
 MariaDB

psalm.xml.dist

@@ -46,11 +46,6 @@
                     is no longer supported.
                 -->
                 <file name="src/Tools/Console/ConsoleRunner.php"/>
-                <!--
-                    TODO: remove in 4.0.0
-                -->
-                <referencedClass name="Doctrine\DBAL\Platforms\Keywords\MySQL57Keywords"/>
-                <referencedClass name="Doctrine\DBAL\Platforms\MySQL57Platform"/>
             </errorLevel>
         </DeprecatedClass>
         <DeprecatedMethod>

src/Driver/AbstractMySQLDriver.php

@@ -11,12 +11,10 @@
 use Doctrine\DBAL\Platforms\AbstractPlatform;
 use Doctrine\DBAL\Platforms\Exception\InvalidPlatformVersion;
 use Doctrine\DBAL\Platforms\MariaDb1027Platform;
-use Doctrine\DBAL\Platforms\MySQL57Platform;
 use Doctrine\DBAL\Platforms\MySQL80Platform;
 use Doctrine\DBAL\Platforms\MySQLPlatform;
 use Doctrine\DBAL\Schema\MySQLSchemaManager;
 use Doctrine\DBAL\ServerVersionProvider;
-use Doctrine\Deprecations\Deprecation;
 
 use function assert;
 use function preg_match;
@@ -46,19 +44,8 @@ public function getDatabasePlatform(ServerVersionProvider $versionProvider): MyS
             if (version_compare($oracleMysqlVersion, '8', '>=')) {
                 return new MySQL80Platform();
             }
-
-            if (version_compare($oracleMysqlVersion, '5.7.9', '>=')) {
-                return new MySQL57Platform();
-            }
         }
 
-        Deprecation::trigger(
-            'doctrine/dbal',
-            'https://github.com/doctrine/dbal/pull/5060',
-            'MySQL 5.6 support is deprecated and will be removed in DBAL 4.'
-                . ' Consider upgrading to MySQL 5.7 or later.'
-        );
-
         return new MySQLPlatform();
     }
 

src/Platforms/Keywords/MySQL80Keywords.php

@@ -9,7 +9,7 @@
 /**
  * MySQL 8.0 reserved keywords list.
  */
-class MySQL80Keywords extends MySQL57Keywords
+class MySQL80Keywords extends MySQLKeywords
 {
     public function getName(): string
     {
@@ -23,9 +23,7 @@ public function getName(): string
      */
     protected function getKeywords(): array
     {
-        $keywords = parent::getKeywords();
-
-        $keywords = array_merge($keywords, [
+        return array_merge(parent::getKeywords(), [
             'ADMIN',
             'ARRAY',
             'CUBE',
@@ -58,7 +56,5 @@ protected function getKeywords(): array
             'SYSTEM',
             'WINDOW',
         ]);
-
-        return $keywords;
     }
 }