how to use make_column to create a field which like char[]、unchar[]

[SwordJoe]

i use c++ to create a struct which has a "char[]" member, so how shoud i create this member's fileld in SQLite whit sqlite_orm.
struct User{ int age; char name[20]; };

[fnc12]

You can try to make row_extractor for it but I am not sure whether it will work cause char[20] is not an object which has copy ctor and other useful stuff which is required for row_extractor. Usually row_extractor is used to add custom types bindings like enum or QString but all of them are C++ types which can be copied and moved. char[20] doesn't have copy and move ctor so I am not sure one can do this. Also assume char[20] can be copied and moved, you created row_extractor and other required extensions. But technically SQLite field may contain string with LENGTH > 20. What will your code do in this case?
So from my perspective the best approach for you is to use std::string instead of char[20]

[trueqbit]

You could attempt to use std::array<char, 20> and create relevant specializations of row_extractor and statement_binder just like for custom types.

[SwordJoe]

thanks, i got it