初始化

app/models/Inventory.php

@@ -0,0 +1,43 @@
+<?php
+namespace app\models;
+
+use core\base\Model;
+
+/**
+ * 库存模型
+ */
+class Inventory extends Model
+{
+    protected $table = 'inventory';
+
+    public function getAll()
+    {
+        return $this->order(['id DESC'])->fetchAll();
+    }
+
+    public function getById($id)
+    {
+        return $this->where(['id = :id'], [':id' => $id])->fetch();
+    }
+
+    public function getLowStock()
+    {
+        return $this->where(['quantity <= min_stock AND min_stock > 0'])->order(['quantity ASC'])->fetchAll();
+    }
+
+    public function getCount()
+    {
+        $sql = 'SELECT COUNT(*) AS cnt, SUM(quantity) AS total_qty FROM ' . $this->getTable();
+        $stmt = $this->pdo->prepare($sql);
+        $stmt->execute();
+        return $stmt->fetch();
+    }
+
+    public function search($keyword)
+    {
+        return $this->where(
+            ['product_name LIKE :kw OR product_model LIKE :kw2 OR category LIKE :kw3'],
+            [':kw' => "%{$keyword}%", ':kw2' => "%{$keyword}%", ':kw3' => "%{$keyword}%"]
+        )->order(['id DESC'])->fetchAll();
+    }
+}