Added get-headid api

backend/main.go

@@ -434,6 +434,17 @@ func connect() {
 				"result": result,
 			})
 
+    case "get-headid":
+			err = db.QueryRow("SELECT IFNULL(employeeid, '') AS result FROM employee WHERE is_head = 1").Scan(&result)
+			if err != nil {
+				c.AbortWithError(http.StatusBadRequest, err)
+				c.String(http.StatusBadRequest, err.Error())
+				return
+			}
+			c.JSON(http.StatusOK, gin.H{
+				"result": result,
+			})
+
 		}
 
 	})