small query compiler progress

demo/main.cpp

@@ -41,6 +41,7 @@ struct book
     namespace field = matador::utils::access;
     field::primary_key(op, "id", id);
     field::attribute(op, "title", title, 511);
+    field::has_one(op, "authors", book_author, matador::utils::default_foreign_attributes);
     field::attribute(op, "published_in", published_in);
   }
 };
@@ -50,7 +51,8 @@ int main()
   using namespace matador::sql;
   const std::string env_var{"MATADOR_BACKENDS_PATH"};
 
-  std::string dns;
+  std::string dns{"sqlite://demo.db"};
+//  std::string dns{"memory://test"};
   auto s = std::make_shared<schema>();
   connection c(dns, s);
 
@@ -61,6 +63,8 @@ int main()
     .on("book.author_id"_col == "author.id"_col)
     .where("book.published_in"_col < 2008 && "author.name"_col == "Michael Crichton")
     .order_by("book.title").asc()
+    .offset(2)
+    .limit(5)
     .fetch_all<book>();
 
   // SELECT book.title, book.id, book.author_id, book.published_in, author.name
@@ -68,6 +72,7 @@ int main()
   // INNER JOIN author ON book.author_id = author.id
   // WHERE book.published_in < 2008 AND author.name = "Michael Crichton"
   // ORDER BY "book.title" ASC
+  // OFFSET 2 LIMIT 5
 
 
 //  char var[1024];

include/matador/sql/query_intermediates.hpp

@@ -73,6 +73,8 @@ public:
 
   statement prepare();
 
+  std::string str() const;
+
 private:
   std::unique_ptr<query_result_impl> fetch();
 };

src/sql/query_intermediates.cpp

@@ -23,6 +23,12 @@ record query_select_finish::fetch_one()
   return *connection_.fetch(compiler.compile(&data_)).begin().get();
 }
 
+std::string query_select_finish::str() const
+{
+  query_compiler compiler(connection_.dialect());
+  return compiler.compile(&data_).sql;
+}
+
 std::unique_ptr<query_result_impl> query_select_finish::fetch()
 {
   query_compiler compiler(connection_.dialect());