At the moment, it is impossible to deriveFromSql orToSql for a data type with generic parameters.

#[derive(FromSql)]structData<'a>{id:i32,description:&'astr,}

Error: missing lifetime specifier

#[derive(ToSql)]structData<T:ToSql>{id:i32,description:String,links:Vec<T>,}

Error: wrong number of type arguments

The generated code forFromSql andToSql doesn't take into account the fact that a structure may have lifetime or type parameters:

https://github.com/sfackler/rust-postgres/blob/cc9b8232a858099e11f8b9e8632566f9b6103a81/postgres-derive/src/fromsql.rs#L62-L64
https://github.com/sfackler/rust-postgres/blob/cc9b8232a858099e11f8b9e8632566f9b6103a81/postgres-derive/src/tosql.rs#L59

Adding support for lifetimes should be relatively straightforward, not sure about type parameters though.