diff --git a/draft/DB.php b/draft/DB.php
index cc0ab8c0f..d71cd533e 100644
--- a/draft/DB.php
+++ b/draft/DB.php
@@ -28,6 +28,44 @@
  * @package     Doctrine
  */
 class Doctrine_DB2 implements Countable, IteratorAggregate, Doctrine_Adapter_Interface {
+    /**
+     * error constants
+     */
+    const ERR                       = -1;
+    const ERR_SYNTAX                = -2;
+    const ERR_CONSTRAINT            = -3;
+    const ERR_NOT_FOUND             = -4;
+    const ERR_ALREADY_EXISTS        = -5;
+    const ERR_UNSUPPORTED           = -6;
+    const ERR_MISMATCH              = -7;
+    const ERR_INVALID               = -8;
+    const ERR_NOT_CAPABLE           = -9;
+    const ERR_TRUNCATED             = -10;
+    const ERR_INVALID_NUMBER        = -11;
+    const ERR_INVALID_DATE          = -12;
+    const ERR_DIVZERO               = -13;
+    const ERR_NODBSELECTED          = -14;
+    const ERR_CANNOT_CREATE         = -15;
+    const ERR_CANNOT_DELETE         = -16;
+    const ERR_CANNOT_DROP           = -17;
+    const ERR_NOSUCHTABLE           = -18;
+    const ERR_NOSUCHFIELD           = -19;
+    const ERR_NEED_MORE_DATA        = -20;
+    const ERR_NOT_LOCKED            = -21;
+    const ERR_VALUE_COUNT_ON_ROW    = -22;
+    const ERR_INVALID_DSN           = -23;
+    const ERR_CONNECT_FAILED        = -24;
+    const ERR_EXTENSION_NOT_FOUND   = -25;
+    const ERR_NOSUCHDB              = -26;
+    const ERR_ACCESS_VIOLATION      = -27;
+    const ERR_CANNOT_REPLACE        = -28;
+    const ERR_CONSTRAINT_NOT_NULL   = -29;
+    const ERR_DEADLOCK              = -30;
+    const ERR_CANNOT_ALTER          = -31;
+    const ERR_MANAGER               = -32;
+    const ERR_MANAGER_PARSE         = -33;
+    const ERR_LOADMODULE            = -34;
+    const ERR_INSUFFICIENT_DATA     = -35;
     /**
      * @var array $instances        all the instances of this class
      */
diff --git a/lib/Doctrine/Db/Mysql.php b/lib/Doctrine/Db/Mysql.php
index d260d106c..5863e3fbf 100644
--- a/lib/Doctrine/Db/Mysql.php
+++ b/lib/Doctrine/Db/Mysql.php
@@ -28,5 +28,29 @@ Doctrine::autoload('Doctrine_Db');
  * @version     $Id$
  */
 class Doctrine_Db_Mysql extends Doctrine_Db {
-
+    protected static $errorCodeMap = array(
+                                      1004 => Doctrine_Db::ERR_CANNOT_CREATE,
+                                      1005 => Doctrine_Db::ERR_CANNOT_CREATE,
+                                      1006 => Doctrine_Db::ERR_CANNOT_CREATE,
+                                      1007 => Doctrine_Db::ERR_ALREADY_EXISTS,
+                                      1008 => Doctrine_Db::ERR_CANNOT_DROP,
+                                      1022 => Doctrine_Db::ERR_ALREADY_EXISTS,
+                                      1044 => Doctrine_Db::ERR_ACCESS_VIOLATION,
+                                      1046 => Doctrine_Db::ERR_NODBSELECTED,
+                                      1048 => Doctrine_Db::ERR_CONSTRAINT,
+                                      1049 => Doctrine_Db::ERR_NOSUCHDB,
+                                      1050 => Doctrine_Db::ERR_ALREADY_EXISTS,
+                                      1051 => Doctrine_Db::ERR_NOSUCHTABLE,
+                                      1054 => Doctrine_Db::ERR_NOSUCHFIELD,
+                                      1061 => Doctrine_Db::ERR_ALREADY_EXISTS,
+                                      1062 => Doctrine_Db::ERR_ALREADY_EXISTS,
+                                      1064 => Doctrine_Db::ERR_SYNTAX,
+                                      1091 => Doctrine_Db::ERR_NOT_FOUND,
+                                      1100 => Doctrine_Db::ERR_NOT_LOCKED,
+                                      1136 => Doctrine_Db::ERR_VALUE_COUNT_ON_ROW,
+                                      1142 => Doctrine_Db::ERR_ACCESS_VIOLATION,
+                                      1146 => Doctrine_Db::ERR_NOSUCHTABLE,
+                                      1216 => Doctrine_Db::ERR_CONSTRAINT,
+                                      1217 => Doctrine_Db::ERR_CONSTRAINT,
+                                      );
 }
diff --git a/lib/Doctrine/Db/Sqlite.php b/lib/Doctrine/Db/Sqlite.php
index 7a2364431..91be34636 100644
--- a/lib/Doctrine/Db/Sqlite.php
+++ b/lib/Doctrine/Db/Sqlite.php
@@ -28,5 +28,36 @@ Doctrine::autoload('Doctrine_Db');
  * @version     $Id$
  */
 class Doctrine_Db_Sqlite extends Doctrine_Db {
+    protected static $errorRegexps = array(
+                              '/^no such table:/'                    => Doctrine_Db::ERR_NOSUCHTABLE,
+                              '/^no such index:/'                    => Doctrine_Db::ERR_NOT_FOUND,
+                              '/^(table|index) .* already exists$/'  => Doctrine_Db::ERR_ALREADY_EXISTS,
+                              '/PRIMARY KEY must be unique/i'        => Doctrine_Db::ERR_CONSTRAINT,
+                              '/is not unique/'                      => Doctrine_Db::ERR_CONSTRAINT,
+                              '/columns .* are not unique/i'         => Doctrine_Db::ERR_CONSTRAINT,
+                              '/uniqueness constraint failed/'       => Doctrine_Db::ERR_CONSTRAINT,
+                              '/may not be NULL/'                    => Doctrine_Db::ERR_CONSTRAINT_NOT_NULL,
+                              '/^no such column:/'                   => Doctrine_Db::ERR_NOSUCHFIELD,
+                              '/column not present in both tables/i' => Doctrine_Db::ERR_NOSUCHFIELD,
+                              '/^near ".*": syntax error$/'          => Doctrine_Db::ERR_SYNTAX,
+                              '/[0-9]+ values for [0-9]+ columns/i'  => Doctrine_Db::ERR_VALUE_COUNT_ON_ROW,
+                              );
 
+    /**
+     * This method is used to collect information about an error
+     *
+     * @param integer $error
+     * @return array
+     * @access public
+     */
+    public function processErrorInfo(array $errorInfo) {
+        foreach (self::$errorRegexps as $regexp => $code) {
+            if (preg_match($regexp, $native_msg)) {
+                $error = $code;
+                break;
+            }
+        }
+
+        return array($error, $native_code, $native_msg);
+    }
 }