Crate hyperdb_api_derive 

Procedural macros for hyperdb-api.

Currently exposes #[derive(FromRow)], which generates an hyperdb_api::FromRow impl for a struct by mapping each field to a column with the matching name.

Re-exported by hyperdb-api so callers don’t need to add this crate as a direct dependency. Use it as use hyperdb_api::FromRow; and #[derive(FromRow)] on a struct.

Example

use hyperdb_api::FromRow;

#[derive(FromRow)]
struct User {
    id: i32,
    name: String,
    // Map to a different column name with `rename`:
    #[hyperdb(rename = "email_address")]
    email: Option<String>,
}

Attributes

• #[hyperdb(rename = "...")] on a field uses the given column name instead of the field name.
• #[hyperdb(index = N)] on a field uses positional access (RowAccessor::position / RowAccessor::position_opt) at column index N instead of name-based lookup. Mutually exclusive with rename.
• Field types of Option<T> use RowAccessor::get_opt / RowAccessor::position_opt (NULL → None); other field types use RowAccessor::get / RowAccessor::position (NULL → error).

Derive Macros

FromRow

Derives hyperdb_api::FromRow for a struct.