spring 接收表单 不填的话为"" 怎么转换成null呢

Question

@RequestMapping(value = "/addProduct")
public void addProducts(ProductExtends pe, HttpServletRequest request, HttpServletResponse response) throws Exception
{｝

09:38:34,272 DEBUG insertSelective:139 - ==>  Preparing: insert into PRODUCT ( PKID, PRODUCTCODEID, MODELCODE, CREATEDATE, DONEDATE, REMARK ) values ( ?, ?, ?, ?, ?, ? ) 

09:38:34,272 DEBUG insertSelective:139 - ==> Parameters: 131430(Long), 251522(Long), 3(String), 2016-06-15 09:38:34.268(Timestamp), 2016-06-15 09:38:34.268(Timestamp), (String)

pe里的remark没有填写，但是后台插入了空值""
有没有把""转换为null对象？
比如@DateTimeFormat(pattern="yyyy-MM-dd HH:mm")//映射日期格式 这种转换器之类的

Answer 1

可以在插入前把""转换成null,这样查询出来就行了呗,或者查询出来先判断,转换一下