Macro query_as 

query_as!() { /* proc-macro */ }

Compile-time validated typed query macro.

Syntax: query_as!(Type, "SQL") or query_as!(Type, "SQL", arg1, arg2, …)

Returns a [hyperdb_api::QueryAs<Type>] builder. Type must implement [hyperdb_api::FromRow] and must be registered via #[derive(Table)] #[hyperdb(register)].

With the compile-time cargo feature enabled, validates at build time that the SQL is syntactically valid, all referenced tables are registered, and all struct fields appear in the projected columns.

Module ordering constraint (compile-time feature)

Registration happens at proc-macro expansion time in the proc-macro host process. Rust expands macros in the order modules are declared in mod statements (top-to-bottom in lib.rs/main.rs). If derive(Table) and query_as! are in different modules, the module containing derive(Table) structs must be declared (via mod) before the module containing query_as! calls, otherwise a false StructNotRegistered compile error is emitted.

Within a single file, struct-level derives always expand before function-body macros, so ordering within a file is not a concern.