Add support for all MySql BLOB type declarations

Choose between TINYBLOB, BLOB, MEDIUMBLOB and LONGBLOB based on the length of the field.
Behaves the same way as the TEXT type declaration.

lib/Doctrine/DBAL/Platforms/MySqlPlatform.php

@@ -710,10 +710,34 @@ class MySqlPlatform extends AbstractPlatform
     }
 
     /**
-     * {@inheritDoc}
+     * Gets the SQL Snippet used to declare a BLOB column type.
+     *     TINYBLOB   : 2 ^  8 - 1 = 255
+     *     BLOB       : 2 ^ 16 - 1 = 65535
+     *     MEDIUMBLOB : 2 ^ 24 - 1 = 16777215
+     *     LONGBLOB   : 2 ^ 32 - 1 = 4294967295
+     *
+     * @param array $field
+     *
+     * @return string
      */
     public function getBlobTypeDeclarationSQL(array $field)
     {
+        if ( ! empty($field['length']) && is_numeric($field['length'])) {
+            $length = $field['length'];
+
+            if ($length <= 255) {
+                return 'TINYBLOB';
+            }
+
+            if ($length <= 65535) {
+                return 'BLOB';
+            }
+
+            if ($length <= 16777215) {
+                return 'MEDIUMBLOB';
+            }
+        }
+
         return 'LONGBLOB';
     }
 }