fix default values for TEXT/BLOB column type on MySQL

lib/Doctrine/DBAL/Platforms/MySqlPlatform.php

@@ -23,6 +23,8 @@ use Doctrine\DBAL\DBALException;
 use Doctrine\DBAL\Schema\TableDiff;
 use Doctrine\DBAL\Schema\Index;
 use Doctrine\DBAL\Schema\Table;
+use Doctrine\DBAL\Types\BlobType;
+use Doctrine\DBAL\Types\TextType;
 
 /**
  * The MySqlPlatform provides the behavior, features and SQL dialect of the
@@ -463,6 +465,19 @@ class MySqlPlatform extends AbstractPlatform
         return $sql;
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function getDefaultValueDeclarationSQL($field)
+    {
+        // Unset the default value if the given field definition does not allow default values.
+        if ($field['type'] instanceof TextType || $field['type'] instanceof BlobType) {
+            $field['default'] = null;
+        }
+
+        return parent::getDefaultValueDeclarationSQL($field);
+    }
+
     /**
      * Build SQL for table options
      *
@@ -570,6 +585,15 @@ class MySqlPlatform extends AbstractPlatform
             /* @var $columnDiff \Doctrine\DBAL\Schema\ColumnDiff */
             $column = $columnDiff->column;
             $columnArray = $column->toArray();
+
+            // Don't propagate default value changes for unsupported column types.
+            if ($columnDiff->hasChanged('default') &&
+                count($columnDiff->changedProperties) === 1 &&
+                ($columnArray['type'] instanceof TextType || $columnArray['type'] instanceof BlobType)
+            ) {
+                continue;
+            }
+
             $columnArray['comment'] = $this->getColumnComment($column);
             $queryParts[] =  'CHANGE ' . ($columnDiff->getOldColumnName()->getQuotedName($this)) . ' '
                     . $this->getColumnDeclarationSQL($column->getQuotedName($this), $columnArray);

tests/Doctrine/Tests/DBAL/Functional/Schema/MySqlSchemaManagerTest.php

@@ -117,4 +117,40 @@ class MySqlSchemaManagerTest extends SchemaManagerFunctionalTestCase
         $this->assertFalse($table->hasPrimaryKey());
         $this->assertFalse($table->getColumn('id')->getAutoincrement());
     }
+
+    /**
+     * @group DBAL-789
+     */
+    public function testDoesNotPropagateDefaultValuesForUnsupportedColumnTypes()
+    {
+        $table = new Table("text_blob_default_value");
+        $table->addColumn('def_text', 'text', array('default' => 'def'));
+        $table->addColumn('def_text_null', 'text', array('notnull' => false, 'default' => 'def'));
+        $table->addColumn('def_blob', 'blob', array('default' => 'def'));
+        $table->addColumn('def_blob_null', 'blob', array('notnull' => false, 'default' => 'def'));
+
+        $this->_sm->dropAndCreateTable($table);
+
+        $onlineTable = $this->_sm->listTableDetails("text_blob_default_value");
+
+        $this->assertNull($onlineTable->getColumn('def_text')->getDefault());
+        $this->assertNull($onlineTable->getColumn('def_text_null')->getDefault());
+        $this->assertFalse($onlineTable->getColumn('def_text_null')->getNotnull());
+        $this->assertNull($onlineTable->getColumn('def_blob')->getDefault());
+        $this->assertNull($onlineTable->getColumn('def_blob_null')->getDefault());
+        $this->assertFalse($onlineTable->getColumn('def_blob_null')->getNotnull());
+
+        $comparator = new Comparator();
+
+        $this->_sm->alterTable($comparator->diffTable($table, $onlineTable));
+
+        $onlineTable = $this->_sm->listTableDetails("text_blob_default_value");
+
+        $this->assertNull($onlineTable->getColumn('def_text')->getDefault());
+        $this->assertNull($onlineTable->getColumn('def_text_null')->getDefault());
+        $this->assertFalse($onlineTable->getColumn('def_text_null')->getNotnull());
+        $this->assertNull($onlineTable->getColumn('def_blob')->getDefault());
+        $this->assertNull($onlineTable->getColumn('def_blob_null')->getDefault());
+        $this->assertFalse($onlineTable->getColumn('def_blob_null')->getNotnull());
+    }
 }

tests/Doctrine/Tests/DBAL/Platforms/AbstractMySQLPlatformTestCase.php

@@ -501,4 +501,28 @@ abstract class AbstractMySQLPlatformTestCase extends AbstractPlatformTestCase
             'CREATE INDEX `bar` ON `table` (id)',
         );
     }
+
+    public function testDoesNotPropagateDefaultValuesForUnsupportedColumnTypes()
+    {
+        $table = new Table("text_blob_default_value");
+        $table->addColumn('def_text', 'text', array('default' => 'def'));
+        $table->addColumn('def_text_null', 'text', array('notnull' => false, 'default' => 'def'));
+        $table->addColumn('def_blob', 'blob', array('default' => 'def'));
+        $table->addColumn('def_blob_null', 'blob', array('notnull' => false, 'default' => 'def'));
+
+        $this->assertSame(
+            array('CREATE TABLE text_blob_default_value (def_text LONGTEXT NOT NULL, def_text_null LONGTEXT DEFAULT NULL, def_blob LONGBLOB NOT NULL, def_blob_null LONGBLOB DEFAULT NULL) DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE = InnoDB'),
+            $this->_platform->getCreateTableSQL($table)
+        );
+
+        $diffTable = clone $table;
+        $diffTable->changeColumn('def_text', array('default' => null));
+        $diffTable->changeColumn('def_text_null', array('default' => null));
+        $diffTable->changeColumn('def_blob', array('default' => null));
+        $diffTable->changeColumn('def_blob_null', array('default' => null));
+
+        $comparator = new Comparator();
+
+        $this->assertEmpty($this->_platform->getAlterTableSQL($comparator->diffTable($table, $diffTable)));
+    }
 }