订单查询，订单更新，新增订单，删除订单的后端实现

backend/src/main/java/com/backend/service/impl/ExpressServiceImpl.java

@@ -0,0 +1,44 @@
+package com.backend.service.impl;
+
+
+import com.backend.mapper.ExpressMapper;
+import com.backend.pojo.Express;
+import com.backend.service.ExpressService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.Date;
+
+@Service
+public class ExpressServiceImpl implements ExpressService {
+
+    @Autowired
+    private ExpressMapper expressMapper;
+
+    @Override
+    public Express findExpressById(String expressid) {
+        return expressMapper.findExpressById(expressid);
+    }
+
+    @Override
+    public void insert(final String expressId,
+                       final String sename, final String sephone, final String seaddress,
+                       final String rename, final String rephone, final String readdress,
+                       final Integer issign, final Date signtime) {
+        expressMapper.add(expressId, sename, sephone, seaddress, rename, rephone, readdress, issign, signtime);
+    }
+
+    @Override
+    public void update(Express express) {
+        expressMapper.update(express);
+    }
+
+    @Override
+    public void delete(final Express express) {
+        expressMapper.delete(express);
+    }
+
+
+
+
+}