bugfix

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

@@ -0,0 +1,25 @@
+<?php
+
+namespace Core\Driver\SQL\Expression;
+
+use Core\Driver\SQL\SQL;
+
+class Coalesce extends Expression {
+
+  private array $values;
+
+  public function __construct(mixed ...$values) {
+    $this->values = $values;
+  }
+
+  function getExpression(SQL $sql, array &$params): string {
+    $values = implode(",", array_map(function ($value) use ($sql, &$params) {
+      if (is_string($value)) {
+        return $sql->columnName($value);
+      } else {
+        return $sql->addValue($value, $params);
+      }
+    }, $this->values));
+    return "COALESCE($values)";
+  }
+}

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

@@ -0,0 +1,22 @@
+<?php
+
+namespace Core\Driver\SQL\Expression;
+
+use Core\Driver\SQL\SQL;
+
+class NullIf extends Expression {
+
+  private mixed $lhs;
+  private mixed $rhs;
+
+  public function __construct(mixed $lhs, mixed $rhs) {
+    $this->lhs = $lhs;
+    $this->rhs = $rhs;
+  }
+
+  function getExpression(SQL $sql, array &$params): string {
+    $lhs = $sql->addValue($this->lhs, $params);
+    $rhs = $sql->addValue($this->rhs, $params);
+    return "NULLIF($lhs, $rhs)";
+  }
+}