报错信息涉及代码及请求 报错原因因为我传入的是start_time和end_time,接收的为start_mon和end_mon,字段不对,参数为空,不能以空值执行数据库查询,所以出现非法运算符和值组合解决办法加个条件判断是否为空,如果为空返回错误提示信息
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