feat: 读写分离

src/main/java/com/yupi/project/service/OrderService.java

@@ -0,0 +1,36 @@
+package com.yupi.project.service;
+
+import com.yupi.project.mapper.OrderMapper;
+import com.yupi.project.model.entity.OrderDO;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+/**
+ * @author Administrator
+ */
+@Service
+public class OrderService {
+
+    @Autowired
+    private OrderMapper orderMapper;
+
+    @Transactional
+    public void add(OrderDO order) {
+        // <1.1> 这里先假模假样的读取一下。读取从库
+        OrderDO exists = orderMapper.selectById(1);
+        System.out.println(exists);
+
+        // <1.2> 插入订单
+        orderMapper.insert(order);
+
+        // <1.3> 这里先假模假样的读取一下。读取主库
+        exists = orderMapper.selectById(1);
+        System.out.println(exists);
+    }
+
+    public OrderDO findById(Integer id) {
+        return orderMapper.selectById(id);
+    }
+
+}