Merge pull request #4112 from morozov/deprecate-driver-exception-error-code

Deprecate DriverException::getErrorCode()

UPGRADE.md

 # Upgrade to 2.11
 
+## `DriverException::getErrorCode()` is deprecated
+
+The `DriverException::getErrorCode()` is deprecated as redundant and inconsistently supported by drivers. Use `::getCode()` or `::getSQLState()` instead.
+
 ## Non-interface driver methods have been marked internal
 
 The non-interface methods of driver-level classes have been marked internal:

lib/Doctrine/DBAL/Driver/Exception.php

@@ -14,6 +14,8 @@ interface Exception extends Throwable
     /**
      * Returns the driver specific error code if available.
      *
+     * @deprecated Use {@link getCode()} or {@link getSQLState()} instead
+     *
      * Returns null if no driver specific error code is available
      * for the error raised by the driver.
      *