Stop relying on Type::__toString

It is a somewhat fragile thing to do.

lib/Doctrine/DBAL/Platforms/AbstractPlatform.php

@@ -1556,7 +1556,7 @@ abstract class AbstractPlatform
             $columnData['version'] = $column->hasPlatformOption("version") ? $column->getPlatformOption('version') : false;
             $columnData['comment'] = $this->getColumnComment($column);
 
-            if (strtolower($columnData['type']) == "string" && $columnData['length'] === null) {
+            if ($columnData['type'] instanceof Types\StringType && $columnData['length'] === null) {
                 $columnData['length'] = 255;
             }
 
@@ -2279,15 +2279,17 @@ abstract class AbstractPlatform
         if (isset($field['default'])) {
             $default = " DEFAULT '".$field['default']."'";
             if (isset($field['type'])) {
-                if (in_array((string) $field['type'], ["Integer", "BigInt", "SmallInt"])) {
+                $type = $field['type'];
+                if ($type instanceof Types\PhpIntegerMappingType) {
                     $default = " DEFAULT ".$field['default'];
-                } elseif (in_array((string) $field['type'], ['DateTime', 'DateTimeTz']) && $field['default'] == $this->getCurrentTimestampSQL()) {
+                } elseif ($type instanceof Types\PhpDateTimeMappingType
+                    && $field['default'] == $this->getCurrentTimestampSQL()) {
                     $default = " DEFAULT ".$this->getCurrentTimestampSQL();
-                } elseif ((string) $field['type'] == 'Time' && $field['default'] == $this->getCurrentTimeSQL()) {
+                } elseif ($type instanceof Types\TimeType && $field['default'] == $this->getCurrentTimeSQL()) {
                     $default = " DEFAULT ".$this->getCurrentTimeSQL();
-                } elseif ((string) $field['type'] == 'Date' && $field['default'] == $this->getCurrentDateSQL()) {
+                } elseif ($type instanceof Types\DateType && $field['default'] == $this->getCurrentDateSQL()) {
                     $default = " DEFAULT ".$this->getCurrentDateSQL();
-                } elseif ((string) $field['type'] == 'Boolean') {
+                } elseif ($type instanceof Types\BooleanType) {
                     $default = " DEFAULT '" . $this->convertBooleans($field['default']) . "'";
                 }
             }

lib/Doctrine/DBAL/Platforms/SQLServerPlatform.php

@@ -27,6 +27,7 @@ use Doctrine\DBAL\Schema\Identifier;
 use Doctrine\DBAL\Schema\Index;
 use Doctrine\DBAL\Schema\Table;
 use Doctrine\DBAL\Schema\TableDiff;
+use Doctrine\DBAL\Types;
 
 /**
  * The SQLServerPlatform provides the behavior, features and SQL dialect of the
@@ -1554,15 +1555,18 @@ class SQLServerPlatform extends AbstractPlatform
             return " DEFAULT '" . $field['default'] . "'";
         }
 
-        if (in_array((string) $field['type'], ['Integer', 'BigInt', 'SmallInt'])) {
+        $type = $field['type'];
+
+        if ($type instanceof Types\PhpIntegerMappingType) {
             return " DEFAULT " . $field['default'];
         }
 
-        if (in_array((string) $field['type'], ['DateTime', 'DateTimeTz']) && $field['default'] == $this->getCurrentTimestampSQL()) {
+        if ($type instanceof Types\PhpDateTimeMappingType
+            && $field['default'] == $this->getCurrentTimestampSQL()) {
             return " DEFAULT " . $this->getCurrentTimestampSQL();
         }
 
-        if ((string) $field['type'] == 'Boolean') {
+        if ($type instanceof Types\BooleanType) {
             return " DEFAULT '" . $this->convertBooleans($field['default']) . "'";
         }
 

lib/Doctrine/DBAL/Platforms/SqlitePlatform.php

@@ -27,6 +27,7 @@ use Doctrine\DBAL\Schema\Identifier;
 use Doctrine\DBAL\Schema\Index;
 use Doctrine\DBAL\Schema\Table;
 use Doctrine\DBAL\Schema\TableDiff;
+use Doctrine\DBAL\Types;
 
 /**
  * The SqlitePlatform class describes the specifics and dialects of the SQLite
@@ -904,7 +905,7 @@ class SqlitePlatform extends AbstractPlatform
             if ( ! $columnDiff->fromColumn instanceof Column ||
                 ! $columnDiff->column instanceof Column ||
                 ! $columnDiff->column->getAutoincrement() ||
-                ! (string) $columnDiff->column->getType() === 'Integer'
+                ! $columnDiff->column->getType() instanceof Types\IntegerType
             ) {
                 continue;
             }
@@ -915,9 +916,9 @@ class SqlitePlatform extends AbstractPlatform
                 continue;
             }
 
-            $fromColumnType = (string) $columnDiff->fromColumn->getType();
+            $fromColumnType = $columnDiff->fromColumn->getType();
 
-            if ($fromColumnType === 'SmallInt' || $fromColumnType === 'BigInt') {
+            if ($fromColumnType instanceof Types\SmallIntType || $fromColumnType instanceof Types\BigIntType) {
                 unset($diff->changedColumns[$oldColumnName]);
             }
         }
@@ -942,17 +943,17 @@ class SqlitePlatform extends AbstractPlatform
             }
 
             $field = array_merge(['unique' => null, 'autoincrement' => null, 'default' => null], $column->toArray());
-            $type = (string) $field['type'];
+            $type = $field['type'];
             switch (true) {
                 case isset($field['columnDefinition']) || $field['autoincrement'] || $field['unique']:
-                case $type == 'DateTime' && $field['default'] == $this->getCurrentTimestampSQL():
-                case $type == 'Date' && $field['default'] == $this->getCurrentDateSQL():
-                case $type == 'Time' && $field['default'] == $this->getCurrentTimeSQL():
+                case $type instanceof Types\DateTimeType && $field['default'] == $this->getCurrentTimestampSQL():
+                case $type instanceof Types\DateType && $field['default'] == $this->getCurrentDateSQL():
+                case $type instanceof Types\TimeType && $field['default'] == $this->getCurrentTimeSQL():
                     return false;
             }
 
             $field['name'] = $column->getQuotedName($this);
-            if (strtolower($field['type']) == 'string' && $field['length'] === null) {
+            if ($type instanceof Types\StringType && $field['length'] === null) {
                 $field['length'] = 255;
             }
 

lib/Doctrine/DBAL/Types/BigIntType.php

@@ -27,7 +27,7 @@ use Doctrine\DBAL\Platforms\AbstractPlatform;
  * @author robo
  * @since 2.0
  */
-class BigIntType extends Type
+class BigIntType extends Type implements PhpIntegerMappingType
 {
     /**
      * {@inheritdoc}

lib/Doctrine/DBAL/Types/DateTimeType.php

@@ -26,7 +26,7 @@ use Doctrine\DBAL\Platforms\AbstractPlatform;
  *
  * @since 2.0
  */
-class DateTimeType extends Type
+class DateTimeType extends Type implements PhpDateTimeMappingType
 {
     /**
      * {@inheritdoc}

lib/Doctrine/DBAL/Types/DateTimeTzType.php

@@ -44,7 +44,7 @@ use Doctrine\DBAL\Platforms\AbstractPlatform;
  * @author Jonathan Wage <jonwage@gmail.com>
  * @author Roman Borschel <roman@code-factory.org>
  */
-class DateTimeTzType extends Type
+class DateTimeTzType extends Type implements PhpDateTimeMappingType
 {
     /**
      * {@inheritdoc}

lib/Doctrine/DBAL/Types/IntegerType.php

@@ -27,7 +27,7 @@ use Doctrine\DBAL\Platforms\AbstractPlatform;
  * @author Roman Borschel <roman@code-factory.org>
  * @since 2.0
  */
-class IntegerType extends Type
+class IntegerType extends Type implements PhpIntegerMappingType
 {
     /**
      * {@inheritdoc}

lib/Doctrine/DBAL/Types/PhpDateTimeMappingType.php

+<?php
+/*
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the MIT license. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\DBAL\Types;
+
+use Doctrine\DBAL\Platforms\AbstractPlatform;
+
+/**
+ * Implementations should map a database type to a PHP DateTimeInterface instance.
+ * @internal
+ */
+interface PhpDateTimeMappingType
+{
+}

lib/Doctrine/DBAL/Types/PhpIntegerMappingType.php

+<?php
+/*
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the MIT license. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\DBAL\Types;
+
+use Doctrine\DBAL\Platforms\AbstractPlatform;
+
+/**
+ * Implementations should map a database type to a PHP integer.
+ * @internal
+ */
+interface PhpIntegerMappingType
+{
+}

lib/Doctrine/DBAL/Types/SmallIntType.php

@@ -26,7 +26,7 @@ use Doctrine\DBAL\Platforms\AbstractPlatform;
  *
  * @author robo
  */
-class SmallIntType extends Type
+class SmallIntType extends Type implements PhpIntegerMappingType
 {
     /**
      * {@inheritdoc}

tests/Doctrine/Tests/DBAL/Functional/Ticket/DBAL461Test.php

@@ -3,6 +3,7 @@
 namespace Doctrine\Tests\DBAL\Functional\Ticket;
 
 use Doctrine\DBAL\Schema\SQLServerSchemaManager;
+use Doctrine\DBAL\Types\DecimalType;
 
 /**
  * @group DBAL-461
@@ -31,6 +32,6 @@ class DBAL461Test extends \PHPUnit\Framework\TestCase
             'comment' => null,
         ));
 
-        self::assertEquals('Decimal', (string)$column->getType());
+        $this->assertInstanceOf(DecimalType::class, $column->getType());
     }
 }