//------------LINQ Query for Inserting Records ------------------
public void insertRecords()
{
using(var db=new WaterUsageEntities())
{
Random rnd = new Random();
db.Configuration.AutoDetectChangesEnabled = false;
for(int pid=1;pid<=1000;pid++) //Person
{
for(int mid=1;mid<=24;mid++) //Month
{
for(int day=1;day<=30;day++) //Day
{
wusage w=new wusage();
w.person_id=pid;
w.month_id=mid;
w.day = day;
w.w_usage=rnd.Next(1,12);
db.wusages.Add(w);
}
}
if (pid % 400 == 0)
{
db.SaveChanges();
Console.WriteLine("\n\nCommit");
}
}
db.SaveChanges();
}
}
//-------------LINQ Query to select person with usage > 200 ---------------
public void selectRecords()
{
using (var db = new WaterUsageEntities())
{
var records = from p in db.People
join w in db.wusages on p.person_id equals w.person_id
join m in db.months on w.month_id equals m.month_id
group new { w.w_usage } by new { w.person_id, p.pname, m.mname, m.year } into g
where g.Key.mname == "January" && g.Key.year == 2012 && g.Sum(w => w.w_usage)>200
select new {pid=g.Key.person_id,name=g.Key.pname,year=g.Key.year,mname=g.Key.mname,usage=g.Sum(w=>w.w_usage)};
Console.WriteLine("PersonId || Name || Month || Year || Usage");
foreach (var row in records)
{
Console.WriteLine("{0} || {1} || {2} || {3} || {4}", row.pid, row.name, row.mname, row.year, row.usage);
}
}
}
