使用MySQL+ibatis进行插入测试的时候，报错：信息如下：
测试插入mon.jdbc.exception.NestedSQLException: --- The error occurred in com/study/ibatis/Student.xml. --- The error occurred while applying a parameter map. --- Check the addStudent-InlineParameterMap. --- Check the statement (update failed). --- Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry 1 for key PRIMARYat com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.executeUpdate(MappedStatement.java:107)at com.ibat
