[DBAL-178] Fixed an undescriptive error message and a problem when using...

[DBAL-178] Fixed an undescriptive error message and a problem when using custom types and their reverse engineering from the database. Allows Type#getMappedDatabaseTypes() to be implemented in custom types, mapping to vendor database types during reverse engineering.

lib/Doctrine/DBAL/DBALException.php

@@ -78,7 +78,11 @@ class DBALException extends \Exception
 
     public static function unknownColumnType($name)
     {
-        return new self('Unknown column type '.$name.' requested.');
+        return new self('Unknown column type "'.$name.'" requested. Any Doctrine type that you use has ' .
+            'to be registered with \Doctrine\DBAL\Types\Type::addType(). You can get a list of all the ' .
+            'known types with \Doctrine\DBAL\Types\Type::getTypeMap(). If the type name is empty you might ' .
+            'have a problem with the cache or forgot some mapping information.'
+        );
     }
 
     public static function typeNotFound($name)

lib/Doctrine/DBAL/Platforms/AbstractPlatform.php

@@ -185,6 +185,21 @@ abstract class AbstractPlatform
      */
     abstract protected function initializeDoctrineTypeMappings();
 
+    /**
+     * Initialize Doctrine Type Mappings with the platform defaults
+     * and with all additional type mappings.
+     */
+    private function initializeAllDoctrineTypeMappings()
+    {
+        $this->initializeDoctrineTypeMappings();
+
+        foreach (Type::getTypesMap() as $typeName => $className) {
+            foreach (Type::getType($typeName)->getMappedDatabaseTypes($this) as $dbType) {
+                $this->doctrineTypeMapping[$dbType] = $typeName;
+            }
+        }
+    }
+
     /**
      * Gets the SQL snippet used to declare a VARCHAR column type.
      *
@@ -254,7 +269,7 @@ abstract class AbstractPlatform
     public function registerDoctrineTypeMapping($dbType, $doctrineType)
     {
         if ($this->doctrineTypeMapping === null) {
-            $this->initializeDoctrineTypeMappings();
+            $this->initializeAllDoctrineTypeMappings();
         }
 
         if (!Types\Type::hasType($doctrineType)) {
@@ -274,7 +289,7 @@ abstract class AbstractPlatform
     public function getDoctrineTypeMapping($dbType)
     {
         if ($this->doctrineTypeMapping === null) {
-            $this->initializeDoctrineTypeMappings();
+            $this->initializeAllDoctrineTypeMappings();
         }
 
         $dbType = strtolower($dbType);
@@ -294,7 +309,7 @@ abstract class AbstractPlatform
     public function hasDoctrineTypeMappingFor($dbType)
     {
         if ($this->doctrineTypeMapping === null) {
-            $this->initializeDoctrineTypeMappings();
+            $this->initializeAllDoctrineTypeMappings();
         }
 
         $dbType = strtolower($dbType);

lib/Doctrine/DBAL/Types/Type.php

@@ -277,4 +277,15 @@ abstract class Type
     {
         return $sqlExpr;
     }
+
+    /**
+     * Get an array of database types that map to this Doctrine type.
+     *
+     * @param AbstractPlatform $platform
+     * @return array
+     */
+    public function getMappedDatabaseTypes(AbstractPlatform $platform)
+    {
+        return array();
+    }
 }