這個錯誤主要原因是：數據庫的配置出問題，比如寫錯庫名什么的，仔細檢查下。
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Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
HTTP Status 500 - org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException
MyBatis 報錯: MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException
Spring+mybatis錯誤：org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.binding.
Spring錯誤：org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.binding.Bi
錯誤：嚴重: Servlet.service() for servlet [appServlet] in context with path [] threw exception [Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 3
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 2 at org.m