public void FromClauseWithAlias()
{
OrderCollection collection = new OrderCollection();
collection.es.Connection.Name = "ForeignKeyTest";
OrderQuery oq = new OrderQuery("o");
OrderItemQuery oiq = new OrderItemQuery("oi");
// Calculate total price per order
switch (collection.es.Connection.ProviderSignature.DataProviderName)
{
//case "EntitySpaces.SqlServerCeProvider":
// Assert.Ignore("Not supported.");
// break;
case "EntitySpaces.NpgsqlProvider":
case "EntitySpaces.Npgsql2Provider":
case "EntitySpaces.OracleClientProvider":
oq.Select(oq.CustID, oq.OrderDate, "<sub.\"OrderTotal\">");
break;
default:
oq.Select(oq.CustID, oq.OrderDate, "<sub.OrderTotal>");
break;
}
oq.From
(
oiq.Select(oiq.OrderID,
(oiq.UnitPrice * oiq.Quantity).Sum().As("OrderTotal"))
.GroupBy(oiq.OrderID)
).As("sub");
oq.InnerJoin(oq).On(oq.OrderID == oiq.OrderID);
oq.OrderBy(oq.OrderID.Ascending);
Assert.IsTrue(collection.Load(oq));
Assert.AreEqual(5, collection.Count);
Assert.AreEqual(13.11m, collection[0].GetColumn("OrderTotal"));
}
public void FromClauseUsingInstance()
{
OrderCollection collection = new OrderCollection();
collection.es.Connection.Name = "ForeignKeyTest";
// Select an arbitrary number of rows from
// any starting row.
int startRow = 4;
int numberOfRows = 7;
// OrderItem SubQuery 1
// Get all rows through start + number, ascending
OrderItemQuery oisq = new OrderItemQuery("ois");
oisq.es.Top = startRow + numberOfRows - 1;
oisq.Select(oisq.OrderID, oisq.ProductID, oisq.Quantity);
oisq.OrderBy(oisq.OrderID.Ascending,
oisq.ProductID.Ascending);
// OrderItem SubQuery 2
// Get just the number of rows, descending
OrderItemQuery oisq2 = new OrderItemQuery("ois2");
oisq2.es.Top = numberOfRows;
oisq2.From(oisq).As("sub1");
switch (collection.es.Connection.ProviderSignature.DataProviderName)
{
//case "EntitySpaces.SqlServerCeProvider":
// Assert.Ignore("Not supported.");
// break;
case "EntitySpaces.NpgsqlProvider":
case "EntitySpaces.Npgsql2Provider":
oisq2.OrderBy("<sub1.\"OrderID\">", esOrderByDirection.Descending);
oisq2.OrderBy("<sub1.\"ProductID\">", esOrderByDirection.Descending);
break;
case "EntitySpaces.OracleClientProvider":
Assert.Ignore("Not supported.");
break;
default:
oisq2.OrderBy("<sub1.OrderID>", esOrderByDirection.Descending);
oisq2.OrderBy("<sub1.ProductID>", esOrderByDirection.Descending);
break;
}
// Put it back in ascending order
OrderQuery oq = new OrderQuery("o");
oq.From(oisq2).As("sub2");
switch (collection.es.Connection.ProviderSignature.DataProviderName)
{
case "EntitySpaces.NpgsqlProvider":
case "EntitySpaces.Npgsql2Provider":
oq.OrderBy("<sub2.\"OrderID\">", esOrderByDirection.Ascending);
oq.OrderBy("<sub2.\"ProductID\">", esOrderByDirection.Ascending);
break;
default:
oq.OrderBy("<sub2.OrderID>", esOrderByDirection.Ascending);
oq.OrderBy("<sub2.ProductID>", esOrderByDirection.Ascending);
break;
}
Assert.IsTrue(collection.Load(oq));
Assert.AreEqual(7, collection.Count);
Assert.AreEqual(10, collection[0].GetColumn("Quantity"));
}
public void FromClause()
{
OrderCollection collection = new OrderCollection();
collection.es.Connection.Name = "ForeignKeyTest";
switch (collection.es.Connection.ProviderSignature.DataProviderName)
{
//case "EntitySpaces.SqlServerCeProvider":
// Assert.Ignore("Not supported.");
// break;
default:
OrderQuery oq = new OrderQuery("o");
OrderItemQuery oiq = new OrderItemQuery("oi");
// The inner Select contains an aggregate,
// which requires a GroupBy for each non-aggregate in the Select.
// The outer Select includes the aggregate from the inner Select,
// plus columns where no GroupBy was desired.
oq.Select(oq.CustID, oq.OrderDate, oiq.UnitPrice);
oq.From
(
oiq.Select(oiq.OrderID, oiq.UnitPrice.Sum()).GroupBy(oiq.OrderID)
).As("sub");
oq.InnerJoin(oq).On(oq.OrderID == oiq.OrderID);
oq.OrderBy(oq.OrderID.Ascending);
Assert.IsTrue(collection.Load(oq));
Assert.AreEqual(5, collection.Count);
Decimal up = Convert.ToDecimal(collection[0].GetColumn("UnitPrice"));
Assert.AreEqual(5.11m, Math.Round(up, 2));
break;
}
}
