express refactor

src/main/java/com/peanut/modules/book/service/ExpressOrderService.java

@@ -0,0 +1,18 @@
+package com.peanut.modules.book.service;
+
+import com.baomidou.mybatisplus.extension.service.IService;
+import com.peanut.modules.book.entity.ExpressOrder;
+import org.springframework.stereotype.Service;
+
+@Service
+public interface ExpressOrderService extends IService<ExpressOrder> {
+    /**
+     * 新增快递订单信息
+     *
+     * @param expressOrder 快递订单
+     * @return object - id
+     */
+    int insertNewExpressOrder(ExpressOrder expressOrder);
+
+
+}