esqueleto is a bare bones, type-safe EDSL for SQL queries
that works with unmodified persistent SQL backends. Its
language closely resembles SQL, so you don't have to learn
new concepts, just new syntax, and it's fairly easy to
predict the generated SQL and optimize it for your backend.
Most kinds of errors committed when writing SQL are caught as
compile-time errors---although it is possible to write
type-checked esqueleto queries that fail at runtime.
persistent is a library for type-safe data serialization. It
has many kinds of backends, such as SQL backends
(persistent-mysql, persistent-postgresql,
persistent-sqlite) and NoSQL backends (persistent-mongoDB).
While persistent is a nice library for storing and retrieving
records, including with filters, it does not try to support
some of the features that are specific to SQL backends. In
particular, esqueleto is the recommended library for
type-safe JOINs on persistent SQL backends. (The
alternative is using raw SQL, but that's error prone and does
not offer any composability.)
Currently, SELECTs, UPDATEs, INSERTs and DELETEs are supported.
Not all SQL features are available, but most of them can be easily added
(especially functions), so please open an issue or send a pull request if
you need anything that is not covered by esqueleto on
https://github.com/prowdsponsor/esqueleto/.
The name of this library means "skeleton" in Portuguese and
contains all three SQL letters in the correct order =). It was
inspired by Scala's Squeryl but created from scratch.
