SQL expression rewrite, Pagination, some frontend stuff

Core/Driver/SQL/Expression/Count.class.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Core\Driver\SQL\Expression;
+
+use Core\Driver\SQL\SQL;
+
+class Count extends Alias {
+  public function __construct(mixed $value = "*", string $alias = "count") {
+    parent::__construct($value, $alias);
+  }
+
+  function addValue(SQL $sql, array &$params): string {
+    $value = $this->getValue();
+    if (is_string($value)) {
+      if ($value === "*") {
+        return "COUNT(*)";
+      } else {
+        return "COUNT(" . $sql->columnName($value) . ")";
+      }
+    } else {
+      return "COUNT(" . $sql->addValue($value, $params) . ")";
+    }
+  }
+}