public static void AggregateFunctionTest()
{
MsSqlContext context = new MsSqlContext(DbHelper.ConnectionString);
var q = context.Query <User>();
q = q.Where(a => a.Id > 0);
var xxx = q.Select(a => DbFunctions.Count()).First();
q.Select(a => new { Count = DbFunctions.Count(), LongCount = DbFunctions.LongCount(), Sum = DbFunctions.Sum(a.Age), Max = DbFunctions.Max(a.Age), Min = DbFunctions.Min(a.Age), Average = DbFunctions.Average(a.Age) }).First();
var count = q.Count();
var longCount = q.LongCount();
var sum = q.Sum(a => a.Age);
var max = q.Max(a => a.Age);
var min = q.Min(a => a.Age);
var avg = q.Average(a => a.Age);
Console.WriteLine(1);
}
public static void GroupQueryTest()
{
MsSqlContext context = new MsSqlContext(DbHelper.ConnectionString);
object ret = null;
var q = context.Query <User>();
var r = q.GroupBy(a => a.Id).Having(a => a.Id > 1).Select(a => new { a.Id, Count = DbFunctions.Count(), Sum = DbFunctions.Sum(a.Id), Max = DbFunctions.Max(a.Id), Min = DbFunctions.Min(a.Id), Avg = DbFunctions.Average(a.Id) }).ToList();
q.GroupBy(a => a.Age).Having(a => a.Age > 1).Select(a => new { a.Age, Count = DbFunctions.Count(), Sum = DbFunctions.Sum(a.Age), Max = DbFunctions.Max(a.Age), Min = DbFunctions.Min(a.Age), Avg = DbFunctions.Average(a.Age) }).ToList();
var r1 = q.GroupBy(a => a.Age).Having(a => DbFunctions.Count() > 0).Select(a => new { a.Age, Count = DbFunctions.Count(), Sum = DbFunctions.Sum(a.Age), Max = DbFunctions.Max(a.Age), Min = DbFunctions.Min(a.Age), Avg = DbFunctions.Average(a.Age) }).ToList();
var g = q.GroupBy(a => a.Gender);
//g = g.ThenBy(a => a.Name);
//g = g.Having(a => a.Id > 0);
//g = g.Having(a => a.Name.Length > 0);
var gq = g.Select(a => new { Count = DbFunctions.Count() });
//gq = gq.Skip(1);
//gq = gq.Take(100);
//gq = gq.Where(a => a > -1);
ret = gq.ToList();
var c = gq.Count();
ConsoleHelper.WriteLineAndReadKey();
}