从数据库中获取介于两个日期之间的数据

Question

I have a data base which has various columns among which are the columns "Effective Date" and "Termination Date"

The situation is before adding a record I need to make sure that there is no overlapping record for the given set of Effective and Termination dates. How could I implement this? I am building the app with MVC using LINQ.

Thanks!

Answer 1

You should check any of records startDate and TerminationDate are in your new record's start and termination date or not, you can do this with linq:

bool overlap = db.Records.Any(x=>(x.TerminationDate >= givenRecord.StartDate 
                  && x.StartDate <= givenRecord.TerminationDate) ||
                  (x.TerminationDate <= givenRecord.TerminationDate 
                  && x.StartDate >= givenRecord.StartDate));

Answer 2

var result = (from t in dbContext.table
             where t.EffectiveDate.Value <= yourDate && 
             t.TerminationDate.Value >= youDate
             select t).Count();
if(result > 0)
{
//Overlap
}