org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.bdqn.dao.BookDao.updateBook

This exception is thrown by MyBatis when it cannot find a mapped statement in the configuration. In this case, the error message specifically states that the bound statement "com.bdqn.dao.BookDao.updateBook" could not be found.

To resolve this issue, you should check your MyBatis configuration file and ensure that the statement is properly mapped. You can also verify that the namespace and ID of the statement in your Java code match the configuration file. If the issue persists, you may need to recompile your code or restart your application server.