总结：出现这种情况，显而易见，就是查询的数据在数据库中不止一条，而我调用的selectOne方法，返回值是一个User对象，导致报错
点击查看错误代码
LambdaQueryWrapper<user> queryWrapper = new LambdaQueryWrapper<>();
queryWrapper.eq(StringUtils.isNotBlank(userId), User::getUserId, userId);
User user = userMapper.selectOne(queryWrapper);
</user>
点击查看报错信息
com.baomidou.mybatisplus.core.exceptions.MybatisPlusException: One record is expected, but the query result is multiple records
at com.baomidou.mybatisplus.core.toolkit.ExceptionUtils.mpe(ExceptionUtils.java:49)
at com.baomidou.mybatisplus.core.mapper.BaseMapper.selectOne(BaseMapper.java:176)
at java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627)
at com.baomidou.mybatisplus.core.override.MybatisMapperProxy$DefaultMethodInvoker.invoke(MybatisMapperProxy.java:162)
at com.baomidou.mybatisplus.core.override.MybatisMapperProxy.invoke(MybatisMapperProxy.java:89)
at com.sun.proxy.$Proxy119.selectOne(Unknown Source)
at com.xxxxx.taview.mcn.service.impl.McnUserServiceImpl.getMcnUserById(McnUserServiceImpl.java:41)
at com.xxxxx.taview.mcn.controller.McnUserController.getMcnUserByUSerID(McnUserController.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150)
Original: https://www.cnblogs.com/huoyl/p/error2.html
Author: h*z
Title: 报错One record is expected, but the query result is multiple records
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