added sqlite db backend progress

backends/sqlite/src/sqlite_connection.cpp

@@ -5,9 +5,8 @@
 
 namespace matador::backends::sqlite {
 
-sqlite_connection::sqlite_connection(sql::connection_info info)
-: connection_impl(std::move(info)) {
-
+sqlite_connection::sqlite_connection(const sql::connection_info &info)
+: connection_impl(info) {
 }
 
 void sqlite_connection::open()
@@ -30,7 +29,7 @@ void sqlite_connection::close()
 
 bool sqlite_connection::is_open()
 {
-  return false;
+  return sqlite_db_ != nullptr;
 }
 
 void sqlite_connection::execute(const std::string &stmt)
@@ -43,4 +42,18 @@ void sqlite_connection::prepare(const std::string &stmt)
 
 }
 
-}
+}
+
+extern "C"
+{
+MATADOR_SQLITE_API matador::sql::connection_impl *create_database(const matador::sql::connection_info &info)
+{
+  return new matador::backends::sqlite::sqlite_connection(info);
+}
+
+MATADOR_SQLITE_API void destroy_database(matador::sql::connection_impl *db)
+{
+  delete db;
+}
+
+}

backends/sqlite/src/sqlite_dialect.cpp

@@ -2,7 +2,7 @@
 
 [[maybe_unused]] const matador::sql::dialect* get_dialect() {
   using namespace matador::sql;
-  static dialect d {{
+  const static dialect d{{
              { dialect::token_t::BEGIN, "BEGIN TRANSACTION"},
              { dialect::token_t::COMMIT, "COMMIT TRANSACTION"},
              { dialect::token_t::ROLLBACK, "ROLLBACK TRANSACTION"}