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+# Upgrade to 2.3
+
+## Oracle Session Init now sets Numeric Character
+
+Before 2.3 the Oracle Session Init did not care about the numeric character of the Session.
+This could lead to problems on non english locale systems that required a comma as a floating
+point seperator in Oracle. Since 2.3, using the Oracle Session Init on connection start the
+client session will be altered to set the numeric character to ".,":
+
+    ALTER SESSION SET NLS_NUMERIC_CHARACTERS = '.,'
+
+See [DBAL-345](http://www.doctrine-project.org/jira/browse/DBAL-345) for more details.
+
+## Doctrine\DBAL\Connection and Doctrine\DBAL\Statement
+
+The query related methods including but not limited to executeQuery, exec, query, and executeUpdate
+now wrap the driver exceptions such as PDOException with DBALException to add more debugging
+information such as the executed SQL statement, and any bound parameters.
+
+If you want to retrieve the driver specific exception, you can retrieve it by calling the
+``getPrevious()`` method on DBALException.
+
+Before:
+
+    catch(\PDOException $ex) {
+        // ...
+    }
+
+After:
+
+    catch(\Doctrine\DBAL\DBALException $ex) {
+        $pdoException = $ex->getPrevious();
+        // ...
+    }
+
+## Doctrine\DBAL\Connection#setCharsetSQL() removed
+
+This method only worked on MySQL and it is considered unsafe on MySQL to use SET NAMES UTF-8 instead
+of setting the charset directly on connection already. Replace this behavior with the
+connection charset option:
+
+Before:
+
+    $conn = DriverManager::getConnection(array(..));
+    $conn->setCharset('UTF8');
+
+After:
+
+    $conn = DriverManager::getConnection(array('charset' => 'UTF8', ..));
+
+## Doctrine\DBAL\Schema\Table#renameColumn() removed
+
+Doctrine\DBAL\Schema\Table#renameColumn() was removed, because it drops and recreates
+the column instead. There is no fix available, because a schema diff
+cannot reliably detect if a column was renamed or one column was created
+and another one dropped.
+
+You should use explicit SQL ALTER TABLE statements to change columns names.
+
+## Schema Filter paths
+
+The Filter Schema assets expression is not wrapped in () anymore for the regexp automatically.
+
+Before:
+
+    $config->setFilterSchemaAssetsExpression('foo');
+
+After:
+
+    $config->setFilterSchemaAssetsExpression('(foo)');
+
+## Creating MySQL Tables now defaults to UTF-8
+
+If you are creating a new MySQL Table through the Doctrine API, charset/collate are
+now set to 'utf8'/'utf8_unicode_ci' by default. Previously the MySQL server defaults were used.
+
+# Upgrade to 2.2
+
+## Doctrine\DBAL\Connection#insert and Doctrine\DBAL\Connnection#update
+
+Both methods now accept an optional last parameter $types with binding types of the values passed.
+This can potentially break child classes that have overwritten one of these methods.
+
+## Doctrine\DBAL\Connection#executeQuery
+
+Doctrine\DBAL\Connection#executeQuery() got a new last parameter "QueryCacheProfile $qcp"
+
+## Doctrine\DBAL\Driver\Statement split
+
+The Driver statement was split into a ResultStatement and the normal statement extending from it.
+This seperates the configuration and the retrieval API from a statement.
+
+## MsSql Platform/SchemaManager renamed
+
+The MsSqlPlatform was renamed to SQLServerPlatform, the MsSqlSchemaManager was renamed
+to SQLServerSchemaManager.
+
+## Cleanup SQLServer Platform version mess
+
+DBAL 2.1 and before were actually only compatible to SQL Server 2008, not earlier versions.
+Still other parts of the platform did use old features instead of newly introduced datatypes
+in SQL Server 2005. Starting with DBAL 2.2 you can pick the Doctrine abstraction exactly
+matching your SQL Server version.
+
+The PDO SqlSrv driver now uses the new `SQLServer2008Platform` as default platform.
+This platform uses new features of SQL Server as of version 2008. This also includes a switch
+in the used fields for "text" and "blob" field types to:
+
+    "text" => "VARCHAR(MAX)"
+    "blob" => "VARBINARY(MAX)"
+
+Additionally `SQLServerPlatform` in DBAL 2.1 and before used "DATE", "TIME" and "DATETIME2" for dates.
+This types are only available since version 2008 and the introduction of an explicit
+SQLServer 2008 platform makes this dependency explicit.
+
+An `SQLServer2005Platform` was also introduced to differentiate the features between
+versions 2003, earlier and 2005.
+
+With this change the `SQLServerPlatform` now throws an exception for using limit queries
+with an offset, since SQLServer 2003 and lower do not support this feature.
+
+To use the old SQL Server Platform, because you are using SQL Server 2003 and below use
+the following configuration code:
+
+    use Doctrine\DBAL\DriverManager;
+    use Doctrine\DBAL\Platforms\SQLServerPlatform;
+    use Doctrine\DBAL\Platforms\SQLServer2005Platform;
+
+    // You are using SQL Server 2003 or earlier
+    $conn = DriverManager::getConnection(array(
+        'driver' => 'pdo_sqlsrv',
+        'platform' => new SQLServerPlatform()
+        // .. additional parameters
+    ));
+
+    // You are using SQL Server 2005
+    $conn = DriverManager::getConnection(array(
+        'driver' => 'pdo_sqlsrv',
+        'platform' => new SQLServer2005Platform()
+        // .. additional parameters
+    ));
+
+    // You are using SQL Server 2008
+    $conn = DriverManager::getConnection(array(
+        'driver' => 'pdo_sqlsrv',
+        // 2008 is default platform
+        // .. additional parameters
+    ));