public void WhereExistsANDedTogether()
{
EmployeeCollection collection = new EmployeeCollection();
collection.es.Connection.ConnectionString =
UnitTestBase.GetFktString(collection.es.Connection);
EmployeeQuery eq1 = new EmployeeQuery("e1");
EmployeeQuery eq2 = new EmployeeQuery("e2");
EmployeeQuery eq3 = new EmployeeQuery("e3");
eq1.Where(eq1.Exists(eq2), eq1.Exists(eq3));
Assert.IsTrue(collection.Load(eq1));
Assert.AreEqual(5, collection.Count);
string lq = collection.Query.es.LastQuery;
string[] one = lq.Split('1');
Assert.AreEqual(2, one.GetLength(0));
string[] two = lq.Split('2');
Assert.AreEqual(2, two.GetLength(0));
string[] three = lq.Split('3');
Assert.AreEqual(2, three.GetLength(0));
}
public void WhereExists()
{
EmployeeCollection collection = new EmployeeCollection();
collection.es.Connection.ConnectionString =
UnitTestBase.GetFktString(collection.es.Connection);
// SubQuery of Employees with a null Supervisor column.
EmployeeQuery sq = new EmployeeQuery("s");
sq.es.Distinct = true;
sq.Select(sq.EmployeeID);
sq.Where(sq.Supervisor.IsNull());
// If even one employee has a null supervisor,
// i.e., the above query has a result set,
// then run a list of all employees.
EmployeeQuery eq = new EmployeeQuery("e");
eq.Select(eq.EmployeeID, eq.Supervisor);
eq.Where(eq.Exists(sq));
Assert.IsTrue(collection.Load(eq));
Assert.AreEqual(5, collection.Count);
}
public void WhereExistsFalse()
{
EmployeeCollection collection = new EmployeeCollection();
collection.es.Connection.ConnectionString =
UnitTestBase.GetFktString(collection.es.Connection);
// EmployeeID is required and will never be NULL
EmployeeQuery sq = new EmployeeQuery("s");
sq.es.Distinct = true;
sq
.Select(sq.EmployeeID)
.Where(sq.EmployeeID.IsNull());
// This should produce no results as the
// inner query does not exist.
EmployeeQuery eq = new EmployeeQuery("e");
eq
.Select(eq.EmployeeID, eq.Supervisor)
.Where(eq.Exists(sq));
Assert.IsFalse(collection.Load(eq));
}