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82 lines
3.7 KiB
C++
82 lines
3.7 KiB
C++
#include <gtest/gtest.h>
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#include <rfl.hpp>
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#include <rfl/json.hpp>
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#include <sqlgen.hpp>
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#include <sqlgen/sqlite.hpp>
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#include <vector>
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namespace test_joins_nested {
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struct Person {
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sqlgen::PrimaryKey<uint32_t> id;
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std::string first_name;
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std::string last_name;
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double age;
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};
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struct Relationship {
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uint32_t parent_id;
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uint32_t child_id;
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};
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TEST(sqlite, test_joins_nested) {
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const auto people1 = std::vector<Person>(
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{Person{
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.id = 0, .first_name = "Homer", .last_name = "Simpson", .age = 45},
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Person{
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.id = 1, .first_name = "Marge", .last_name = "Simpson", .age = 40},
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Person{.id = 2, .first_name = "Bart", .last_name = "Simpson", .age = 10},
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Person{.id = 3, .first_name = "Lisa", .last_name = "Simpson", .age = 8},
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Person{
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.id = 4, .first_name = "Maggie", .last_name = "Simpson", .age = 0}});
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const auto relationships =
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std::vector<Relationship>({Relationship{.parent_id = 0, .child_id = 2},
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Relationship{.parent_id = 0, .child_id = 3},
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Relationship{.parent_id = 0, .child_id = 4},
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Relationship{.parent_id = 1, .child_id = 2},
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Relationship{.parent_id = 1, .child_id = 3},
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Relationship{.parent_id = 1, .child_id = 4}});
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using namespace sqlgen;
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struct ParentAndChild {
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std::string last_name;
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std::string first_name_parent;
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std::string first_name_child;
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double parent_age_at_birth;
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};
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const auto get_children =
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select_from<Relationship, "t1">("parent_id"_t1 | as<"id">,
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"first_name"_t2 | as<"first_name">,
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"age"_t2 | as<"age">) |
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left_join<Person, "t2">("id"_t2 == "child_id"_t1);
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const auto get_people =
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select_from<Person, "t1">(
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"last_name"_t1 | as<"last_name">,
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"first_name"_t1 | as<"first_name_parent">,
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"first_name"_t2 | as<"first_name_child">,
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("age"_t1 - "age"_t2) | as<"parent_age_at_birth">) |
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inner_join<"t2">(get_children, "id"_t1 == "id"_t2) |
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order_by("id"_t1, "id"_t2) | to<std::vector<ParentAndChild>>;
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const auto people = sqlite::connect()
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.and_then(write(std::ref(people1)))
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.and_then(write(std::ref(relationships)))
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.and_then(get_people)
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.value();
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const std::string expected_query =
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R"(SELECT t1."last_name" AS "last_name", t1."first_name" AS "first_name_parent", t2."first_name" AS "first_name_child", (t1."age") - (t2."age") AS "parent_age_at_birth" FROM "Person" t1 INNER JOIN (SELECT t1."parent_id" AS "id", t2."first_name" AS "first_name", t2."age" AS "age" FROM "Relationship" t1 LEFT JOIN "Person" t2 ON t2."id" = t1."child_id") t2 ON t1."id" = t2."id" ORDER BY t1."id", t2."id")";
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const std::string expected =
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R"([{"last_name":"Simpson","first_name_parent":"Homer","first_name_child":"Bart","parent_age_at_birth":35.0},{"last_name":"Simpson","first_name_parent":"Homer","first_name_child":"Lisa","parent_age_at_birth":37.0},{"last_name":"Simpson","first_name_parent":"Homer","first_name_child":"Maggie","parent_age_at_birth":45.0},{"last_name":"Simpson","first_name_parent":"Marge","first_name_child":"Bart","parent_age_at_birth":30.0},{"last_name":"Simpson","first_name_parent":"Marge","first_name_child":"Lisa","parent_age_at_birth":32.0},{"last_name":"Simpson","first_name_parent":"Marge","first_name_child":"Maggie","parent_age_at_birth":40.0}])";
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EXPECT_EQ(sqlite::to_sql(get_people), expected_query);
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EXPECT_EQ(rfl::json::write(people), expected);
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}
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} // namespace test_joins_nested
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