refactoring and minor changes

msql_acces.cpp

@@ -37,3 +37,18 @@ std::list<std::string> msql_acces::get_pinfo(){
   delete res;
   return ret;
 }
+
+void msql_acces::write_install(std::string package, std::string user){
+  sql::PreparedStatement *pstmt =
+      con->prepareStatement("insert into packages(name,user) values(?,(select id from users where username=?))");
+  pstmt->setString(1,package);
+  pstmt->setString(2,user);
+  pstmt->executeUpdate();
+}
+
+void msql_acces::write_remove(std::string package){
+  sql::PreparedStatement *pstmt =
+      con->prepareStatement("delete from packages where name=?");
+  pstmt->setString(1,package);
+  pstmt->executeUpdate();
+}