func TestExcept(t *testing.T) {
relationOne := nodes.Relation("table_one")
relationTwo := nodes.Relation("table_two")
relationThree := nodes.Relation("table_three")
one := nodes.SelectStatement(relationOne)
two := nodes.SelectStatement(relationTwo)
three := nodes.SelectStatement(relationThree)
one.Combinator = nodes.Except(one, two)
two.Combinator = nodes.Except(two, three)
expected := `(SELECT FROM "table_one" EXCEPT (SELECT FROM "table_two" EXCEPT SELECT FROM "table_three"))`
if got, _ := sql.Accept(one); expected != got {
t.Errorf("TestUnion was expected to return %s, got %s", expected, got)
}
}
func TestSelectStatement(t *testing.T) {
relation := nodes.Relation("table")
stmt := nodes.SelectStatement(relation)
expected := `SELECT FROM "table"`
if got, _ := sql.Accept(stmt); expected != got {
t.Errorf("TestSelectStatement was expected to return %s, got %s", expected, got)
}
}
// SelectManager factory method.
func Selection(relation *nodes.RelationNode) (selection *SelectManager) {
selection = new(SelectManager)
selection.Tree = nodes.SelectStatement(relation)
selection.Context = selection.Tree.Cores[0]
return
}