[DBAL-407] Implement error detection on duplicate key for mysql and sqlite

lib/Doctrine/DBAL/DBALException.php

@@ -91,7 +91,7 @@ class DBALException extends \Exception
         }
         $msg .= ":\n\n".$driverEx->getMessage();
 
-        return new self($msg, 0, $driverEx);
+        return new self($msg, $driver->convertExceptionCode($driverEx), $driverEx);
     }
 
     /**

lib/Doctrine/DBAL/Driver/PDOMySql/Driver.php

@@ -20,6 +20,7 @@
 namespace Doctrine\DBAL\Driver\PDOMySql;
 
 use Doctrine\DBAL\Connection;
+use Doctrine\DBAL\DBALException;
 
 /**
  * PDO MySql driver.
@@ -114,6 +115,11 @@ class Driver implements \Doctrine\DBAL\Driver
      */
     public function convertExceptionCode(\Exception $exception)
     {
+        switch ($exception->getCode()) {
+            case 23000:
+                return DBALException::ERROR_DUPLICATE_KEY;
+        }
+
         return 0;
     }
 }

lib/Doctrine/DBAL/Driver/PDOSqlite/Driver.php

@@ -18,6 +18,7 @@
  */
 
 namespace Doctrine\DBAL\Driver\PDOSqlite;
+use Doctrine\DBAL\DBALException;
 
 /**
  * The PDO Sqlite driver.
@@ -118,6 +119,11 @@ class Driver implements \Doctrine\DBAL\Driver
      */
     public function convertExceptionCode(\Exception $exception)
     {
+        switch ($exception->getCode()) {
+            case 23000:
+                return DBALException::ERROR_DUPLICATE_KEY;
+        }
+
         return 0;
     }
 }