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This commit is contained in:
Roland Bock 2024-06-26 07:11:01 +02:00
parent c70ceaceb0
commit 6eb791430a
2 changed files with 88 additions and 6 deletions
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5
include/sqlpp11/alias.h
View File

@ -41,6 +41,11 @@ namespace sqlpp
using _alias_t = typename AliasProvider::_alias_t;
sqlpp::compat::optional<expression_alias_t> if_(bool condition) const
{
return condition ? sqlpp::compat::make_optional(*this) : sqlpp::compat::nullopt;
}
expression_alias_t(Expression expression) : _expression(expression)
{
}

87
tests/core/types/result_row.cpp
View File

@ -31,9 +31,19 @@
namespace
{
template<typename A, typename B>
constexpr bool is_same_type()
{
return std::is_same<A, B>::value;
}
constexpr auto bar = test::TabBar{};
constexpr auto foo = test::TabFoo{};
auto db = MockDb{};
}
int main()
{
static_assert(not sqlpp::can_be_null_t<decltype(bar.id)>::value, "");
static_assert(sqlpp::can_be_null_t<decltype(foo.doubleN)>::value, "");
static_assert(not sqlpp::can_be_null_t<decltype(foo.textNnD)>::value, "");
@ -41,16 +51,81 @@ namespace
const auto seven = sqlpp::value(7).as(sqlpp::alias::s);
static_assert(not sqlpp::can_be_null_t<decltype(seven)>::value, "");
auto db = MockDb{};
void single_table()
// Select non-optional column or alias of it.
for (const auto& row : db(select(foo.id, foo.id.as(sqlpp::alias::a), foo.textNnD, foo.textNnD.as(sqlpp::alias::b))
.from(foo)
.unconditionally()))
{
static_assert(is_same_type<decltype(row.id), int64_t>(), "");
static_assert(is_same_type<decltype(row.a), int64_t>(), "");
static_assert(is_same_type<decltype(row.textNnD), sqlpp::compat::string_view>(), "");
static_assert(is_same_type<decltype(row.b), sqlpp::compat::string_view>(), "");
}
// Optionally select non-optional column or alias of it.
for (const auto& row : db(select(foo.id.if_(true), foo.id.as(sqlpp::alias::a).if_(true), foo.textNnD.if_(true),
foo.textNnD.as(sqlpp::alias::b).if_(true))
.from(foo)
.unconditionally()))
{
static_assert(is_same_type<decltype(row.id), sqlpp::compat::optional<int64_t>>(), "");
static_assert(is_same_type<decltype(row.a), sqlpp::compat::optional<int64_t>>(), "");
static_assert(is_same_type<decltype(row.textNnD), sqlpp::compat::optional<sqlpp::compat::string_view>>(), "");
static_assert(is_same_type<decltype(row.b), sqlpp::compat::optional<sqlpp::compat::string_view>>(), "");
}
// Select optional column or alias of it.
for (const auto& row : db(select(bar.intN, bar.intN.as(sqlpp::alias::a), bar.textN, bar.textN.as(sqlpp::alias::b))
.from(bar)
.unconditionally()))
{
static_assert(is_same_type<decltype(row.intN), sqlpp::compat::optional<int64_t>>(), "");
static_assert(is_same_type<decltype(row.a), sqlpp::compat::optional<int64_t>>(), "");
static_assert(is_same_type<decltype(row.textN), sqlpp::compat::optional<sqlpp::compat::string_view>>(), "");
static_assert(is_same_type<decltype(row.b), sqlpp::compat::optional<sqlpp::compat::string_view>>(), "");
}
// Optionally select optional column or alias of it.
for (const auto& row : db(select(bar.intN.if_(true), bar.intN.as(sqlpp::alias::a).if_(true), bar.textN.if_(true),
bar.textN.as(sqlpp::alias::b).if_(true))
.from(bar)
.unconditionally()))
{
// optional optional are still represented as one level of optional
static_assert(is_same_type<decltype(row.intN), sqlpp::compat::optional<int64_t>>(), "");
static_assert(is_same_type<decltype(row.a), sqlpp::compat::optional<int64_t>>(), "");
static_assert(is_same_type<decltype(row.textN), sqlpp::compat::optional<sqlpp::compat::string_view>>(), "");
static_assert(is_same_type<decltype(row.b), sqlpp::compat::optional<sqlpp::compat::string_view>>(), "");
}
// Select value and optional value.
sqlpp::value(7);
/*
for (const auto& row : db(select(sqlpp::value(7).as(sqlpp::alias::a),
sqlpp::value(sqlpp::compat::optional<int>(7)).as(sqlpp::alias::b))))
*/
{
/*
static_assert(is_same_type<decltype(row.a), int64_t>(), "");
static_assert(is_same_type<decltype(row.a), sqlpp::compat::optional<int64_t>>(), "");
static_assert(is_same_type<decltype(row.textN), sqlpp::compat::optional<sqlpp::compat::string_view>>(), "");
static_assert(is_same_type<decltype(row.b), sqlpp::compat::optional<sqlpp::compat::string_view>>(), "");
*/
}
#if 0
{
// result fields are as nullable as the expressions they represent
const auto rows = db(select(bar.id, bar.boolNn, seven).from(bar).unconditionally());
const auto rows = db(select(bar.id, bar.boolNn, bar.intN, seven).from(bar).unconditionally());
auto& x = rows.front();
#warning: test with nullable columns, too.
#warning: test with all kinds of functions as well.
#warning: We should actually test for the exact type!
static_assert(not is_optional<decltype(x.id)>::value, "");
static_assert(not is_optional<decltype(x.boolNn)>::value, "");
static_assert(is_optional<decltype(x.intN)>::value, "");
static_assert(not is_optional<decltype(x.s)>::value, "");
}
}
@ -63,10 +138,11 @@ namespace
#warning: test with nullable columns, too.
#warning: test with all kinds of functions as well.
#warning: We should actually test for the exact type!
const auto rows = db(select(bar.id.if_(true), bar.boolNn.if_(true)/*, seven*/).from(bar).unconditionally());
const auto rows = db(select(bar.id.if_(true), bar.boolNn.if_(true), bar.intN.if_(true) /*, seven*/).from(bar).unconditionally());
auto& x = rows.front();
static_assert(is_optional<decltype(x.id)>::value, "");
static_assert(is_optional<decltype(x.boolNn)>::value, "");
static_assert(is_optional<decltype(x.intN)>::value, "");
}
}
@ -251,4 +327,5 @@ int main(int, char* [])
optional_columns();
join();
aggregates();
#endif
}