public void ItShouldBePossibleToInnerJoinATableOnItselfSeveralTimes()
{
var child = Table <Person> .WithReferenceName("child");
var parent = Table <Person> .WithReferenceName("parent");
var grandparent = Table <Person> .WithReferenceName("grandparent");
var expr = Select.Column(grandparent, gp => new { gp.Name, gp.Age })
.From(child)
.InnerJoin(child, parent, (c, p) => c.ParentId == p.Id)
.InnerJoin(child, parent, grandparent, (c, p, gp) => p.ParentId == gp.Id && c.LivesAtHouseId == gp.LivesAtHouseId);
var result = expr.ToSqlExpression();
var expected =
S.SelectNode(
S.Select(
S.Col(grandparent, "Name"),
S.Col(grandparent, "Age")),
S.From(
child,
S.Join(
child,
parent,
grandparent,
JoinType.InnerJoin,
S.BinExp(
S.BinExp(S.Col(parent, "ParentId"), BinaryOperation.Equal, S.Col(grandparent, "Id")),
BinaryOperation.And,
S.BinExp(S.Col(child, "LivesAtHouseId"), BinaryOperation.Equal, S.Col(grandparent, "LivesAtHouseId")))),
S.Join(child, parent, JoinType.InnerJoin, S.BinExp(S.Col(child, "ParentId"), BinaryOperation.Equal, S.Col(parent, "Id")))));
Assert.That(result, Is.EqualTo(expected));
}
public void ItShouldBePossibleToUseMultipleHavingExpressions()
{
var stream =
S.SelectNode(
S.Select(
S.Col <Person>("Name"),
S.Aggregate(AggregateType.Avg, S.Col <Person>("Age")),
S.Col <Car>("Brand"),
S.Aggregate(AggregateType.Min, S.Col <Car>("Age"))),
S.From <Person>(
S.Join <Person, Car>(JoinType.InnerJoin, S.BinExp(S.Col <Person>("Id"), BinaryOperation.Equal, S.Col <Car>("DriverId")))),
groupBy:
S.GroupBy(
new[] { S.Col <Person>("Name"), S.Col <Car>("Brand"), },
S.And(S.BinExp(S.Aggregate(AggregateType.Avg, S.Col <Person>("Age")), BinaryOperation.GreaterThan, S.Const(42))),
S.And(S.BinExp(S.Aggregate(AggregateType.Min, S.Col <Car>("Age")), BinaryOperation.GreaterThan, S.Const(2)))));
var result = SqlGen.SqlifyExpression(AnsiSql.Dialect, stream);
Assert.That(
result,
Is.EqualTo(
"SELECT PersonRef.Name, AVG(PersonRef.Age), CarRef.Brand, MIN(CarRef.Age) " +
"FROM Person PersonRef " +
"INNER JOIN Car CarRef ON PersonRef.Id = CarRef.DriverId " +
"GROUP BY PersonRef.Name, CarRef.Brand " +
"HAVING AVG(PersonRef.Age) > 42 " +
"AND MIN(CarRef.Age) > 2"));
}
private SqlExpression GetExpectedJoinStream(JoinType joinKeyword)
{
return
(S.SelectNode(
S.Select(S.Star <Person>(), S.Star <Car>()),
S.From <Person>(
S.Join <Person, Car>(joinKeyword, S.BinExp(S.Col <Person>("Id"), BinaryOperation.Equal, S.Col <Car>("DriverId")))
)));
}
public void ItShouldBePossibleToSelectFromSeveralCommonTableExpressions()
{
var oldies = Table <PersonLite> .WithTableAlias("Oldies");
var younglings = Table <PersonLite> .WithTableAlias("YoungOnes");
var expr =
S.SelectNode(
S.With(
S.TableDef(
younglings,
S.Select(S.Col <Person>("Name"), S.Col <Person>("Age")),
S.From <Person>(),
S.Where(S.BinExp(S.Col <Person>("Age"), BinaryOperation.LessThanOrEqual, S.Const(15)))),
S.TableDef(
oldies,
S.Select(S.Col <Person>("Name"), S.Col <Person>("Age")),
S.From <Person>(),
S.Where(S.BinExp(S.Col <Person>("Age"), BinaryOperation.GreaterThan, S.Const(40))))
),
S.Select(S.Col(oldies, "Name"), S.Col(younglings, "Name")),
S.From(
oldies,
S.Join(
oldies,
younglings,
Domain.AST.JoinType.InnerJoin,
S.BinExp(
S.BinExp(S.Col(oldies, "Age"), BinaryOperation.Subtract, S.Const(30)),
BinaryOperation.Equal,
S.Col(younglings, "Age"))))
);
var result = SqlGen.SqlifyExpression(Dialects.AnsiSql.Dialect, expr);
var expected =
"WITH Oldies AS (" +
"SELECT PersonRef.Name, PersonRef.Age " +
"FROM Person PersonRef " +
"WHERE PersonRef.Age > 40" +
"), YoungOnes AS (" +
"SELECT PersonRef.Name, PersonRef.Age " +
"FROM Person PersonRef " +
"WHERE PersonRef.Age <= 15" +
") " +
"SELECT OldiesRef.Name, YoungOnesRef.Name " +
"FROM Oldies OldiesRef " +
"INNER JOIN YoungOnes YoungOnesRef ON OldiesRef.Age - 30 = YoungOnesRef.Age";
Assert.That(result, Is.EqualTo(expected));
}
public void ItShouldBeAbleToSqlifyMultipleTableJoins()
{
var stream =
S.SelectNode(
S.Select(S.Star <Person>(), S.Star <Car>(), S.Star <House>()),
S.From <House>(
S.Join <House, Person>(JoinType.InnerJoin, S.BinExp(S.Col <House>("Id"), BinaryOperation.Equal, S.Col <Person>("LivesAtHouseId"))),
S.Join <Person, Car>(JoinType.LeftJoin, S.BinExp(S.Col <Person>("Id"), BinaryOperation.Equal, S.Col <Car>("DriverId")))));
var result = SqlGen.SqlifyExpression(AnsiSql.Dialect, stream);
Assert.That(
result,
Is.EqualTo(
@"SELECT PersonRef.*, CarRef.*, HouseRef.* " +
"FROM House HouseRef " +
"INNER JOIN Person PersonRef ON HouseRef.Id = PersonRef.LivesAtHouseId " +
"LEFT JOIN Car CarRef ON PersonRef.Id = CarRef.DriverId"));
}
public void ItShouldBePossibleToJoinATableToItself()
{
var child = Table <Person> .WithReferenceName("child");
var parent = Table <Person> .WithReferenceName("parent");
var stream =
S.SelectNode(
S.Select(S.Col(child, "Name"), S.Col(parent, "Name")),
S.From(
child,
S.Join(child, parent, JoinType.InnerJoin, S.BinExp(S.Col(child, "ParentId"), BinaryOperation.Equal, S.Col(parent, "Id")))));
var result = SqlGen.SqlifyExpression(AnsiSql.Dialect, stream);
Assert.That(result,
Is.EqualTo("SELECT child.Name, parent.Name FROM Person child " +
"INNER JOIN Person parent ON child.ParentId = parent.Id"));
}
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));
}
public void ItShouldBePossibleToOrderBySeveralColumns()
{
var stream =
S.SelectNode(
S.Select(S.Star <Person>(), S.Star <Car>()),
S.From <Person>(
S.Join <Person, Car>(JoinType.InnerJoin, S.BinExp(S.Col <Person>("Id"), BinaryOperation.Equal, S.Col <Car>("DriverId")))),
orderBy:
S.OrderBy(
S.OrderClause(S.Col <Person>("Age"), Direction.Ascending),
S.OrderClause(S.Col <Car>("Brand"), Direction.Descending)));
var result = SqlGen.SqlifyExpression(AnsiSql.Dialect, stream);
Assert.That(
result,
Is.EqualTo(
@"SELECT PersonRef.*, CarRef.* FROM Person PersonRef " +
"INNER JOIN Car CarRef ON PersonRef.Id = CarRef.DriverId " +
"ORDER BY PersonRef.Age ASC, CarRef.Brand DESC"));
}
public void ItShouldBePossibleToGroupByColumnsFromSeveralTables()
{
var stream =
S.SelectNode(
S.Select(S.Col <Person>("Age"), S.Col <Car>("Brand"), S.Aggregate(AggregateType.Count, S.Null())),
S.From <Person>(
S.Join <Person, Car>(
JoinType.InnerJoin,
S.BinExp(S.Col <Person>("Id"), BinaryOperation.Equal, S.Col <Car>("DriverId")))),
groupBy: S.GroupBy(S.Col <Person>("Age"), S.Col <Car>("Brand")));
var result = SqlGen.SqlifyExpression(AnsiSql.Dialect, stream);
Assert.That(
result,
Is.EqualTo(
"SELECT PersonRef.Age, CarRef.Brand, COUNT(*) " +
"FROM Person PersonRef " +
"INNER JOIN Car CarRef ON PersonRef.Id = CarRef.DriverId " +
"GROUP BY PersonRef.Age, CarRef.Brand"));
}
public void ItShouldBePossibleToJoinATableToItself()
{
var child = Table <Person> .WithReferenceName("child");
var parent = Table <Person> .WithReferenceName("parent");
var expr = Select.Column(child, p => new { p.Name })
.Column(parent, p => new { p.Name })
.From(child)
.InnerJoin(child, parent, (p1, p2) => p1.ParentId == p2.Id);
var result = expr.ToSqlExpression();
var expected =
S.SelectNode(
S.Select(S.Col(parent, "Name"), S.Col(child, "Name")),
S.From(
child,
S.Join(child, parent, JoinType.InnerJoin, S.BinExp(S.Col(child, "ParentId"), BinaryOperation.Equal, S.Col(parent, "Id")))));
Assert.That(result, Is.EqualTo(expected));
}
public void ItShouldBePossibleToInnerJoinATableOnSeveralOtherTables()
{
var expr = Select.Star <Car>()
.From <House>()
.InnerJoin <House, Person>((h, p) => h.Id == p.LivesAtHouseId)
.InnerJoin <House, Person, Car>((h, p, c) => c.Brand == h.Address && p.LivesAtHouseId == h.Id);
var result = expr.ToSqlExpression();
var expected =
S.SelectNode(
S.Select(S.Star <Car>()),
S.From <House>(
S.Join <House, Person, Car>(
JoinType.InnerJoin,
S.BinExp(
S.BinExp(S.Col <Car>("Brand"), BinaryOperation.Equal, S.Col <House>("Address")),
BinaryOperation.And,
S.BinExp(S.Col <Person>("LivesAtHouseId"), BinaryOperation.Equal, S.Col <House>("Id")))),
S.Join <House, Person>(
JoinType.InnerJoin,
S.BinExp(S.Col <House>("Id"), BinaryOperation.Equal, S.Col <Person>("LivesAtHouseId")))));
Assert.That(result, Is.EqualTo(expected));
}
public void ItCanGenerateSqlForAConcatFunctionCall()
{
var stream =
S.SelectNode(
S.Select(S.Func(AST.FunctionType.Concat, new[] { S.Col <Person>("Name"), S.Col <Car>("Brand"), S.Col <Person>("Name") })),
S.From <Person>(
S.Join <Person, Car>(
AST.JoinType.InnerJoin,
S.BinExp(S.Col <Person>("Id"), BinaryOperation.Equal, S.Col <Car>("DriverId")))),
S.Where(
S.BinExp(
S.Func(AST.FunctionType.Concat, new[] { S.Col <Person>("Name"), S.Col <Car>("Brand"), }),
BinaryOperation.Equal,
S.Const("'kallesaab'"))));
var result = SqlGen.SqlifyExpression(AnsiSql.Dialect, stream);
string expected =
"SELECT CONCAT(PersonRef.Name, CarRef.Brand, PersonRef.Name) " +
"FROM Person PersonRef " +
"INNER JOIN Car CarRef ON PersonRef.Id = CarRef.DriverId " +
"WHERE CONCAT(PersonRef.Name, CarRef.Brand) = 'kallesaab'";
Assert.That(result, Is.EqualTo(expected));
}
