How to package the parsed Excel data into objects and write this object set into the database?

The phenomenon and background of the problem

Today, I am learning parsing Excel file , Write the parsed data into the database , But the parsed data is a set , I don't know how to write to the database , Always report mistakes

Problem related code , Do not paste screenshots

mapper Code

mybatis Of xml file

service layer

This is a controller layer , Will be resolved list The objects in the collection are written to the database

This is the analysis Excel Get the object

This is the content of the error report , I didn't know how to do it for hours , Write only list The first one in the collection , The latter cannot be written into the database
org.apache.ibatis.binding.BindingException: Mapper method 'com.xjh.exceljiexi.mapper.UserExcelModelMapper.insert' has an unsupported return type: class com.xjh.exceljiexi.domain.UserExcelModel
at org.apache.ibatis.binding.MapperMethod.rowCountResult(MapperMethod.java:118) ~[mybatis-3.5.9.jar:3.5.9]
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:62) ~[mybatis-3.5.9.jar:3.5.9]
at org.apache.ibatis.binding.MapperProxy$PlainMethodInvoker.invoke(MapperProxy.java:145) ~[mybatis-3.5.9.jar:3.5.9]
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:86) ~[mybatis-3.5.9.jar:3.5.9]
at com.sun.proxy.$Proxy59.insert(Unknown Source) ~[na:na]
at com.xjh.exceljiexi.service.impl.UserExcelModelImpl.addUser(UserExcelModelImpl.java:24) ~[classes/:na]
at com.xjh.exceljiexi.controller.FileController.readExcel(FileController.java:53) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_301]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_301]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_301]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_301]

This error has been stuck for threeorfour hours , How to modify the code to complete this function ？ Ask for an answer

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Take the answer ：

Have a look at , I didn't find anything wrong , But I have a little suggestion , You can set breakpoints when inserting data into the database , Check the currently inserted domain Whether the object is wrong , If it's normal , That means all your previous codes are correct , Only myBatis There are some problems here . Then continue to look slowly

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