pagination + sql expressions + frontend improvements

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

@@ -0,0 +1,28 @@
+<?php
+
+namespace Core\Driver\SQL\Expression;
+
+use Core\Driver\SQL\SQL;
+
+abstract class AbstractFunction extends Expression {
+
+  private string $functionName;
+  private mixed $value;
+
+  public function __construct(string $functionName, mixed $value) {
+    $this->functionName = $functionName;
+    $this->value = $value;
+  }
+
+  public function getExpression(SQL $sql, array &$params): string {
+    return $this->functionName . "(" . $sql->addValue($this->getValue(), $params) . ")";
+  }
+
+  public function getFunctionName(): string {
+    return $this->functionName;
+  }
+
+  public function getValue(): mixed {
+    return $this->value;
+  }
+}