Rework handling quoted object names and reserved SQL keywords

UPGRADE.md

@@ -8,6 +8,28 @@ awareness about deprecated code.
 
 # Upgrade to 5.0
 
+## BC BREAK: Removed Reserved Keyword Lists
+
+The following components have been removed:
+
+1. The `KeywordList` class and all its subclasses.
+2. The methods `AbstractPlatform::createReservedKeywordsList()` and `::getReservedKeywordsList()`.
+3. The `AbstractPlatform::$_keywords` property.
+
+Prior to this change, DBAL would automatically quote reserved keywords and, as a side effect, preserve their case
+on platforms that adhere to the SQL-92 standard (i.e., preserve lowercase identifiers on Oracle and IBM DB2,
+and uppercase ones on PostgreSQL).
+
+With this change, DBAL will:
+1. Normalize the case of unquoted identifiers to match the behavior of the target database platform:
+    - Oracle and IBM DB2 – uppercase.
+    - PostgreSQL – lowercase.
+    - All other platforms – no modification.
+2. Consistently quote all identifiers in SQL, regardless of whether they are keywords or not.
+
+To preserve lowercase identifiers on Oracle and IBM DB2 or uppercase identifiers on PostgreSQL, quote the identifiers
+explicitly.
+
 ## BC BREAK: Removed `AbstractPlatform::quoteIdentifier()` and `Connection::quoteIdentifier()`
 
 The `AbstractPlatform::quoteIdentifier()` and `Connection::quoteIdentifier()` methods have been removed.

psalm.xml.dist

@@ -42,24 +42,6 @@
                 <file name="src/Driver/OCI8/ConvertPositionalToNamedPlaceholders.php"/>
             </errorLevel>
         </ConflictingReferenceConstraint>
-        <DeprecatedClass>
-            <errorLevel type="suppress">
-                <!--
-                    https://github.com/doctrine/dbal/pull/6607
-                    TODO: remove in 5.0.0
-                -->
-                <referencedClass name="Doctrine\DBAL\Platforms\Keywords\KeywordList" />
-                <referencedClass name="Doctrine\DBAL\Platforms\Keywords\DB2Keywords" />
-                <referencedClass name="Doctrine\DBAL\Platforms\Keywords\MariaDBKeywords" />
-                <referencedClass name="Doctrine\DBAL\Platforms\Keywords\MySQLKeywords" />
-                <referencedClass name="Doctrine\DBAL\Platforms\Keywords\MySQL84Keywords" />
-                <referencedClass name="Doctrine\DBAL\Platforms\Keywords\PostgreSQLKeywords" />
-                <referencedClass name="Doctrine\DBAL\Platforms\Keywords\OracleKeywords" />
-                <referencedClass name="Doctrine\DBAL\Platforms\Keywords\SQLiteKeywords" />
-                <referencedClass name="Doctrine\DBAL\Platforms\Keywords\SQLServerKeywords" />
-                <referencedClass name="Doctrine\DBAL\Platforms\MySQL84Platform" />
-            </errorLevel>
-        </DeprecatedClass>
         <DeprecatedMethod>
             <errorLevel type="suppress">
                 <!--
@@ -73,24 +55,8 @@
 
                 <!-- TODO for PHPUnit 11 -->
                 <referencedMethod name="PHPUnit\Framework\TestCase::iniSet"/>
-
-                <!--
-                    https://github.com/doctrine/dbal/pull/6607
-                    TODO: remove in 5.0.0
-                -->
-                <referencedMethod name="Doctrine\DBAL\Platforms\AbstractPlatform::createReservedKeywordsList" />
-                <referencedMethod name="Doctrine\DBAL\Platforms\AbstractPlatform::getReservedKeywordsList" />
             </errorLevel>
         </DeprecatedMethod>
-        <DeprecatedProperty>
-            <errorLevel type="suppress">
-                <!--
-                    https://github.com/doctrine/dbal/pull/6607
-                    TODO: remove in 5.0.0
-                -->
-                <referencedProperty name="Doctrine\DBAL\Platforms\AbstractPlatform::$_keywords" />
-            </errorLevel>
-        </DeprecatedProperty>
         <DocblockTypeContradiction>
             <errorLevel type="suppress">
                 <!--

src/Driver/AbstractMySQLDriver.php

@@ -12,7 +12,6 @@
 use Doctrine\DBAL\Platforms\MariaDB1010Platform;
 use Doctrine\DBAL\Platforms\MariaDB1060Platform;
 use Doctrine\DBAL\Platforms\MariaDBPlatform;
-use Doctrine\DBAL\Platforms\MySQL84Platform;
 use Doctrine\DBAL\Platforms\MySQLPlatform;
 use Doctrine\DBAL\ServerVersionProvider;
 
@@ -46,10 +45,6 @@ public function getDatabasePlatform(ServerVersionProvider $versionProvider): Abs
             return new MariaDBPlatform();
         }
 
-        if (version_compare($version, '8.4.0', '>=')) {
-            return new MySQL84Platform();
-        }
-
         return new MySQLPlatform();
     }
 

src/Platforms/AbstractMySQLPlatform.php

@@ -7,16 +7,13 @@
 use Doctrine\DBAL\Connection;
 use Doctrine\DBAL\Exception;
 use Doctrine\DBAL\Exception\InvalidColumnType\ColumnValuesRequired;
-use Doctrine\DBAL\Platforms\Keywords\KeywordList;
-use Doctrine\DBAL\Platforms\Keywords\MySQLKeywords;
 use Doctrine\DBAL\Schema\AbstractAsset;
 use Doctrine\DBAL\Schema\ForeignKeyConstraint;
 use Doctrine\DBAL\Schema\Index;
 use Doctrine\DBAL\Schema\MySQLSchemaManager;
 use Doctrine\DBAL\Schema\TableDiff;
 use Doctrine\DBAL\TransactionIsolationLevel;
 use Doctrine\DBAL\Types\Types;
-use Doctrine\Deprecations\Deprecation;
 
 use function array_map;
 use function array_merge;
@@ -757,19 +754,6 @@ protected function initializeDoctrineTypeMappings(): void
         ];
     }
 
-    /** @deprecated */
-    protected function createReservedKeywordsList(): KeywordList
-    {
-        Deprecation::triggerIfCalledFromOutside(
-            'doctrine/dbal',
-            'https://github.com/doctrine/dbal/pull/6607',
-            '%s is deprecated.',
-            __METHOD__,
-        );
-
-        return new MySQLKeywords();
-    }
-
     /**
      * {@inheritDoc}
      *

src/Platforms/AbstractPlatform.php

@@ -16,7 +16,6 @@
 use Doctrine\DBAL\LockMode;
 use Doctrine\DBAL\Platforms\Exception\NoColumnsSpecifiedForTable;
 use Doctrine\DBAL\Platforms\Exception\NotSupported;
-use Doctrine\DBAL\Platforms\Keywords\KeywordList;
 use Doctrine\DBAL\Schema\AbstractSchemaManager;
 use Doctrine\DBAL\Schema\Column;
 use Doctrine\DBAL\Schema\ForeignKeyConstraint;
@@ -36,7 +35,6 @@
 use Doctrine\DBAL\Types;
 use Doctrine\DBAL\Types\Exception\TypeNotFound;
 use Doctrine\DBAL\Types\Type;
-use Doctrine\Deprecations\Deprecation;
 
 use function addcslashes;
 use function array_map;
@@ -74,13 +72,6 @@ abstract class AbstractPlatform
     /** @var string[]|null */
     protected ?array $doctrineTypeMapping = null;
 
-    /**
-     * Holds the KeywordList instance for the current platform.
-     *
-     * @deprecated
-     */
-    protected ?KeywordList $_keywords = null;
-
     /**
      * Returns the SQL snippet that declares a boolean column.
      *
@@ -2125,31 +2116,6 @@ public function rollbackSavePoint(string $savepoint): string
         return 'ROLLBACK TO SAVEPOINT ' . $savepoint;
     }
 
-    /**
-     * Returns the keyword list instance of this platform.
-     *
-     * @deprecated
-     */
-    final public function getReservedKeywordsList(): KeywordList
-    {
-        Deprecation::triggerIfCalledFromOutside(
-            'doctrine/dbal',
-            'https://github.com/doctrine/dbal/pull/6607',
-            '%s is deprecated.',
-            __METHOD__,
-        );
-
-        // Store the instance so it doesn't need to be generated on every request.
-        return $this->_keywords ??= $this->createReservedKeywordsList();
-    }
-
-    /**
-     * Creates an instance of the reserved keyword list of this platform.
-     *
-     * @deprecated
-     */
-    abstract protected function createReservedKeywordsList(): KeywordList;
-
     /**
      * Quotes a literal string.
      * This method is NOT meant to fix SQL injections!

src/Platforms/DB2Platform.php

@@ -6,8 +6,6 @@
 
 use Doctrine\DBAL\Connection;
 use Doctrine\DBAL\Platforms\Exception\NotSupported;
-use Doctrine\DBAL\Platforms\Keywords\DB2Keywords;
-use Doctrine\DBAL\Platforms\Keywords\KeywordList;
 use Doctrine\DBAL\Schema\ColumnDiff;
 use Doctrine\DBAL\Schema\DB2SchemaManager;
 use Doctrine\DBAL\Schema\Identifier;
@@ -18,7 +16,6 @@
 use Doctrine\DBAL\TransactionIsolationLevel;
 use Doctrine\DBAL\Types\DateTimeType;
 use Doctrine\DBAL\Types\Types;
-use Doctrine\Deprecations\Deprecation;
 
 use function array_merge;
 use function count;
@@ -592,19 +589,6 @@ public function supportsSavepoints(): bool
         return false;
     }
 
-    /** @deprecated */
-    protected function createReservedKeywordsList(): KeywordList
-    {
-        Deprecation::triggerIfCalledFromOutside(
-            'doctrine/dbal',
-            'https://github.com/doctrine/dbal/pull/6607',
-            '%s is deprecated.',
-            __METHOD__,
-        );
-
-        return new DB2Keywords();
-    }
-
     public function createSchemaManager(Connection $connection): DB2SchemaManager
     {
         return new DB2SchemaManager($connection, $this);