oracle中date类型的比较

字段 dtCreatDates 在oracle中为DATE类型,java类中为 DATE类型.

private Date dtCreatDate;

现在从条件框返回一个格式为"2015-06-03"的String类型的字符串,在service中用sql语句进行日期的条件查询.

那么需要将string类型转换为日期类型,再与日期类型进行比较...

代码如下:

Service:
String hql = "SELECT COUNT(*) FROM Instructions  ";
hql =hql+where;

String strStartDate=ParamUtil.getString(request,"strStartDate","");//格式为:2010-05-03
String strEndDate=ParamUtil.getString(request,"strEndDate","");//格式为:2016-06-01

if(!strStartDate.equals("")){
tWhere+=" and dtCreatDate>=to_date('"+strStartDate+" 00:00:00','yyyy-mm-dd hh24:mi:ss')";
}
if(!strEndDate.equals("")){
tWhere+=" and dtCreatDate<=to_date('"+strEndDate+" 23:59:59','yyyy-mm-dd hh24:mi:ss')";
}

int count = objSvr.getCount(tWhere);

打印的语句如下:

WHERE intVirDel<>1 and dtCreatDate>=to_date('2016-06-01 00:00:00','yyyy-mm-dd hh24:mi:ss') and dtCreatDate<=to_date('2016-06-24 23:59:59','yyyy-mm-dd hh24:mi:ss')