Added support for CREATE TABLE AS and CREATE VIEW AS (thus adding support for views) (#40)

tests/sqlite/test_create_table_as.cpp

@@ -0,0 +1,60 @@
+#include <gtest/gtest.h>
+
+#include <rfl.hpp>
+#include <rfl/json.hpp>
+#include <sqlgen.hpp>
+#include <sqlgen/sqlite.hpp>
+#include <vector>
+
+namespace test_create_table_as {
+
+struct Person {
+  sqlgen::PrimaryKey<uint32_t> id;
+  std::string first_name;
+  std::string last_name;
+  int age;
+};
+
+struct Name {
+  std::string first_name;
+  std::string last_name;
+};
+
+TEST(sqlite, test_create_table_as) {
+  using namespace sqlgen;
+  using namespace sqlgen::literals;
+
+  const auto people = std::vector<Person>(
+      {Person{
+           .id = 0, .first_name = "Homer", .last_name = "Simpson", .age = 45},
+       Person{
+           .id = 1, .first_name = "Marge", .last_name = "Simpson", .age = 40},
+       Person{.id = 2, .first_name = "Bart", .last_name = "Simpson", .age = 10},
+       Person{.id = 3, .first_name = "Lisa", .last_name = "Simpson", .age = 8},
+       Person{
+           .id = 4, .first_name = "Maggie", .last_name = "Simpson", .age = 0}});
+
+  const auto names_query = select_from<Person>("first_name"_c, "last_name"_c);
+
+  const auto get_names = create_as<Name>(names_query) | if_not_exists;
+
+  const auto names = sqlgen::sqlite::connect()
+                         .and_then(drop<Name> | if_exists)
+                         .and_then(drop<Person> | if_exists)
+                         .and_then(write(std::ref(people)))
+                         .and_then(get_names)
+                         .and_then(sqlgen::read<std::vector<Name>>)
+                         .value();
+
+  const std::string expected_query =
+      R"(CREATE TABLE IF NOT EXISTS "Name" AS SELECT "first_name", "last_name" FROM "Person")";
+
+  const std::string expected =
+      R"([{"first_name":"Homer","last_name":"Simpson"},{"first_name":"Marge","last_name":"Simpson"},{"first_name":"Bart","last_name":"Simpson"},{"first_name":"Lisa","last_name":"Simpson"},{"first_name":"Maggie","last_name":"Simpson"}])";
+
+  EXPECT_EQ(sqlite::to_sql(get_names), expected_query);
+  EXPECT_EQ(rfl::json::write(names), expected);
+}
+
+}  // namespace test_create_table_as
+