My patches to the Haskell persistent library

Matt Parsons 3e88b423b0 bump persistent-test version (#905) 1 year ago
.github c3135c5881 Add Github templates and files to help with reproducing issues 2 years ago
bin e8dbafb099 Tidying up a few things 1 year ago
docs 3259636539 Sum type docs 1 year ago
experimental ecf0a52786 Up dependency on the base package to >= 4.6 (removes GHC 7.4 support) 5 years ago
persistent f18b5dcba0 Merge branch 'master' of github.com:yesodweb/persistent 1 year ago
persistent-mongoDB 700086e36d Releases 1 year ago
persistent-mysql 700086e36d Releases 1 year ago
persistent-postgresql fb29c8fd3a Persist.PostgreSQL.JSON haddock fix (#898) 1 year ago
persistent-qq 1e356ad119 Matt/build with cabal (#900) 1 year ago
persistent-redis a3eed2f7c5 Cleanup of pragmas, imports and dependencies (#888) 1 year ago
persistent-sqlite 1e356ad119 Matt/build with cabal (#900) 1 year ago
persistent-template 10ff69c7b9 mkEntityDefList (#904) 1 year ago
persistent-test 3e88b423b0 bump persistent-test version (#905) 1 year ago
persistent-zookeeper 3591de2525 Merge branch 'http-api-data-release' 4 years ago
travis 1e356ad119 Matt/build with cabal (#900) 1 year ago
.dockerignore ed25be45d3 improve Docker build 5 years ago
.gitattributes 4c582f1d99 Fix language stat(s) for persistent repo. (#663) 3 years ago
.gitignore e8dbafb099 Tidying up a few things 1 year ago
.gitmodules d99d6855de Remove scripts submodule 5 years ago
.travis.yml 10ff69c7b9 mkEntityDefList (#904) 1 year ago
CONTRIBUTING.md e8dbafb099 Tidying up a few things 1 year ago
LICENSE 62e3056a5d Update license with MIT license 8 years ago
README.md e8dbafb099 Tidying up a few things 1 year ago
cabal.project 1e356ad119 Matt/build with cabal (#900) 1 year ago
development.md e8dbafb099 Tidying up a few things 1 year ago
docker-compose.yml 2093ccb94b add testing setup for postgres 2 years ago
justfile b7eaba651d a better docker-based testing approach 2 years ago
sources.txt 722929f636 Add persistent-zookeeper for persistent-2.1.* 5 years ago
stack-docker.yaml 7c12ad4e9d Create separate persistent-qq (fixes #827) 2 years ago
stack.yaml 0d87a7c434 [CI] Add newer resolvers, update tested ones (#873) 1 year ago
stack_lts-10.yaml a3eed2f7c5 Cleanup of pragmas, imports and dependencies (#888) 1 year ago
stack_lts-12.yaml 28d4c2c987 JSON "question mark" operators for persistent-postgresql (#884) 1 year ago

README.md

Learn more: http://www.yesodweb.com/book/persistent

Build Status Hackage Hackage-Deps

A Haskell datastore. Datastores are often referred to as "ORM"s. While 'O' traditionally means object, the concept can be generalized as:

avoidance of boilerplate serialization

In addition , the ORM concept is a way to make what is usually an un-typed driver type-safe. In dynamic languages rather than compile time errors, safety comes from creating specific dynamic errors rather than sending nonsense queries to the database.

Persistent's goal is to catch every possible error at compile-time, and it comes close to that.

Backend agnostic

Supports PostgreSql, Sqlite, MongoDB, Redis, ZooKeeper, and many other databases via persistent-odbc. The MySQL backend is in need of a maintainer. Currently there are issues with migrations and support for composite and primary keys is lacking.

Persistent is designed to be adaptable to any datastore, and to allow multiple datastores to be used simultaneously. The serialization layer should be adaptable to any datastore.

Providing a universal query layer will always be limiting. A major limitation for SQL databases is that the persistent library does not directly provide joins. However, you can use Esqueleto with Persistent's serialization to write type-safe SQL queries. Key-value stores such as Redis can be used with persistent, but only fill out the key-value portion of the API (PersistStore) rather than the query portion (PersistQuery).

Persistent provides several hooks to create backend-specific functionality. One can always fall back to using the raw database driver or other lower-level or less type-safe libraries and can utilize Persistent for un-serializing the database response to a Haskell record.

Install from source

Clone the repo and run stack build to build all targets. Persistent supports many backends. If you have only some of these installed the development doc shows how to build against a subset of targets.