public void ItShouldHandleASimpleUnionAll()
{
var stream =
AST.SqlExpression.NewSelect(
AST.SelectExpression.NewPlain(
AST.PlainSelectExpression.NewSet(
S.UnionAll(
S.PlainSelect(
S.Select(S.Star <Person>()),
S.From <Person>(),
S.Where(
S.BinExp(S.Col <Person>("Age"), AST.BinaryOperation.GreaterThan, S.Const(42)))),
S.PlainSelect(
S.Select(S.Star <Person>()),
S.From <Person>(),
S.Where(
S.BinExp(S.Col <Person>("Name"), AST.BinaryOperation.Equal, S.Const("'Kalle'"))))
))));
var result = SqlGen.SqlifyExpression(AnsiSql.Dialect, stream);
var expected =
"SELECT PersonRef.* FROM Person PersonRef WHERE PersonRef.Age > 42 " +
"UNION ALL " +
"SELECT PersonRef.* FROM Person PersonRef WHERE PersonRef.Name = 'Kalle'";
Assert.That(result, Is.EqualTo(expected));
}
public void ItShouldBePossibleToDoARecursiveCommonTableExpression()
{
var stream =
S.SelectNode(
S.With(
S.TableDef <RecursivePerson>(
S.UnionAll(
S.PlainSelect(
S.Select(
S.AliasedCol(S.Const(0), "Level"),
S.Col <Person>("Name"),
S.Col <Person>("ParentId")),
S.From <Person>(),
S.Where(
S.BinExp(S.Col <Person>("Name"), BinaryOperation.Equal, S.Const("'Kalle'")))),
S.PlainSelect(
S.Select(
S.AliasedCol(
S.BinExp(S.Col <RecursivePerson>("Level"), BinaryOperation.Add, S.Const(1)), "Level"),
S.Col <Person>("Name"),
S.Col <Person>("ParentId")),
S.From <Person>(
S.Join <Person, RecursivePerson>(
AST.JoinType.InnerJoin,
S.BinExp(S.Col <Person>("Id"), BinaryOperation.Equal, S.Col <RecursivePerson>("ParentId")))))))),
S.PlainSelect(
S.Select(S.Star <RecursivePerson>()),
S.From <RecursivePerson>()));
var result = SqlGen.SqlifyExpression(Dialects.AnsiSql.Dialect, stream);
var expected =
"WITH RecursivePerson AS (" +
"SELECT 0 AS Level, PersonRef.Name, PersonRef.ParentId FROM Person PersonRef WHERE PersonRef.Name = 'Kalle' " +
"UNION ALL " +
"SELECT RecursivePersonRef.Level + 1 AS Level, PersonRef.Name, PersonRef.ParentId " +
"FROM Person PersonRef " +
"INNER JOIN RecursivePerson RecursivePersonRef ON PersonRef.Id = RecursivePersonRef.ParentId" +
") " +
"SELECT RecursivePersonRef.* FROM RecursivePerson RecursivePersonRef";
Assert.That(result, Is.EqualTo(expected));
}