初始化

app/models/PurchaseOrder.php

@@ -0,0 +1,36 @@
+<?php
+namespace app\models;
+
+use core\base\Model;
+
+/**
+ * 采购订单模型
+ */
+class PurchaseOrder extends Model
+{
+    protected $table = 'purchase_order';
+
+    public function getAll()
+    {
+        return $this->order(['id DESC'])->fetchAll();
+    }
+
+    public function getById($id)
+    {
+        return $this->where(['id = :id'], [':id' => $id])->fetch();
+    }
+
+    public function getBySupplier($supplierId)
+    {
+        return $this->where(['supplier_id = :sid'], [':sid' => $supplierId])->order(['id DESC'])->fetchAll();
+    }
+
+    public function getCount()
+    {
+        $sql = 'SELECT COUNT(*) AS cnt FROM ' . $this->getTable();
+        $stmt = $this->pdo->prepare($sql);
+        $stmt->execute();
+        $row = $stmt->fetch();
+        return (int)($row['cnt'] ?? 0);
+    }
+}