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core/Driver/SQL/Expression/Add.class.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Driver\SQL\Expression;
+
+use Driver\SQL\Condition\Compare;
+
+class Add extends Compare {
+
+  public function __construct($col, $val) {
+    parent::__construct($col, $val, "+");
+  }
+
+}

core/Driver/SQL/MySQL.class.php

@@ -13,6 +13,7 @@ use \Driver\SQL\Column\DateTimeColumn;
 use Driver\SQL\Column\BoolColumn;
 use Driver\SQL\Column\JsonColumn;
 
+use Driver\SQL\Expression\Add;
 use Driver\SQL\Strategy\Strategy;
 use \Driver\SQL\Strategy\UpdateStrategy;
 
@@ -172,8 +173,13 @@ class MySQL extends SQL {
         if ($value instanceof Column) {
           $columnName = $this->columnName($value->getName());
           $updateValues[] = "$leftColumn=$columnName";
+        } else if($value instanceof Add) {
+          $columnName = $this->columnName($value->getColumn());
+          $operator = $value->getOperator();
+          $value = $value->getValue();
+          $updateValues[] = "$leftColumn=$columnName$operator" . $this->addValue($value, $params);
         } else {
-          $updateValues[] = "`$leftColumn=" . $this->addValue($value, $params);
+          $updateValues[] = "$leftColumn=" . $this->addValue($value, $params);
         }
       }
 

core/Driver/SQL/SQL.class.php

@@ -292,6 +292,12 @@ abstract class SQL {
     }
   }
 
+  public function sum($col) {
+    $sumCol = strtolower(str_replace(".","_", $col)) .  "_sum";
+    $col = $this->columnName($col);
+    return new Keyword("SUM($col) AS $sumCol");
+  }
+
   public function distinct($col) {
     $col = $this->columnName($col);
     return new Keyword("DISTINCT($col)");