- WIP on Collation

src/Common/Sql.php

@@ -62,7 +62,7 @@ abstract class Sql {
             } 
         };
     }
-    
+
     public static function raw(string $sql) : object
     {
         return static::identifier($sql);
@@ -84,8 +84,12 @@ abstract class Sql {
         return $value;
     }
 
-    public static function parameter($value) : string
+    public static function collate(string $name) : string
     {
-        
+        if ( ! preg_match('/^[a-z0-9$_]+$/i',$name) ) {
+            throw new \InvalidArgumentException(sprintf("Given identifier '%s' should contains supported characters in function name (a-Z, 0-9, $ and _)", $name));
+        }
+
+        return static::raw(sprintf("COLLATE %s", $name));
     }
 }