feat: 读写分离

src/main/java/com/yupi/project/mapper/OrderMapper.java

@@ -1,12 +1,13 @@
 package com.yupi.project.mapper;
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import com.yupi.project.model.entity.OrderDO;
 import org.apache.ibatis.annotations.Mapper;
 
 @Mapper
-public interface OrderMapper {
+public interface OrderMapper extends BaseMapper<OrderDO> {
 
 
 
-    void insert(OrderDO order);
+//    void insert(OrderDO order);
 
 }

src/main/java/com/yupi/project/model/entity/OrderDO.java

@@ -1,6 +1,8 @@
 package com.yupi.project.model.entity;
 
+import com.baomidou.mybatisplus.annotation.TableName;
 import lombok.Data;
+import lombok.experimental.Accessors;
 
 import java.io.Serializable;
 
@@ -9,6 +11,8 @@ import java.io.Serializable;
  * @author Administrator
  */
 @Data
+@TableName(value = "orders")
+@Accessors(chain = true)
 public class OrderDO implements Serializable {
 
     /**

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);
+    }
+
+}