I would really like to see something similar to Slick (Scala) for Rust. This one says it's an ORM, but a simple query compile time type checker (an example: http://slick.typesafe.com/doc/3.0.0/sql.html) would already be great.
sflacker has a library that does this for Postgres: https://github.com/sfackler/rust-postgres is the connection/query/etc part, and https://github.com/sfackler/rust-postgres-macros actually links with the postgres query parser to provide compile-time SQL syntax checking.