persistent

Type-safe, multi-backend data serialization.

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

Version on this page:2.7.0
LTS Haskell 23.21:2.14.6.3@rev:1
Stackage Nightly 2025-05-03:2.14.6.3@rev:1
Latest on Hackage:2.15.1.0

See all snapshots persistent appears in

MIT licensed by Michael Snoyman
Maintained by Michael Snoyman, Greg Weber
This version can be pinned in stack with:persistent-2.7.0@sha256:5e8d31eb48e5bf4954e6dd4ffb36ceb5c7d207cc6e88fc013a4d2b2d050ec4d6,5011

Module documentation for 2.7.0

  • Database
    • Database.Persist
      • Database.Persist.Class
      • Database.Persist.Quasi
      • Database.Persist.Sql
        • Database.Persist.Sql.Types
          • Database.Persist.Sql.Types.Internal
        • Database.Persist.Sql.Util
      • Database.Persist.Types

persistent

Type-safe, data serialization. You must use a specific backend in order to make this useful. For more information, see the chapter in the Yesod book.

Changes

2.7.0

  • Fix upsert behavior #613
  • Atomic upsert query fixed for arithmatic operations #662
  • Haddock and test coverage improved for upsert

2.6.1

  • Fix edge case for \<-. [Nothing]
  • Introduce connMaxParams
  • Add ‘getJustEntity’ and ‘insertRecord’ convenience function
  • Minor Haddock improvment

2.6

  • Add connUpsertSql type for providing backend-specific upsert sql support.

2.5

  • read/write typeclass split
  • add insertOrGet convenience function to PersistUnique

2.2.4.1

  • Documentation updates #515

2.2.4

  • Workaround for side-exiting transformers in runSqlConn #516

2.2.3

  • PersistField instance for Natural
  • better oracle support in odbc

2.2.2

  • Add liftSqlPersistMPool function
  • support http-api-data for url serialization

2.2.1

  • Migration failure message with context
  • Fix insertKey for composite keys

2.2

  • Add a RawSql instance for Key. This allows selecting primary keys using functions like rawSql. #407
  • SqlBackend support for an optimized insertMany

2.1.6

Important! If persistent-template is not upgraded to 2.1.3.3 you might need to make sure Int64 is in scope for your model declarations.

  • add showMigration function
  • explicitly use Int64 for foreign key references

2.1.5

Add dbIdColumnsEsc to Sql.Utils. Used in persistent-postgresql 2.1.5.2

2.1.4

  • Fix getBy with a primary key. #342

2.1.3

  • Break self-referencing cycles in the entity declarations

2.1.2

  • Error with Doubles without a decimal part #378
  • runSqlPool does not perform timeout checks.

2.1.1.6

  • One extra feature for #939: use logDebugN instead

2.1.1.5

2.1.1.3

Parse UTCTime in 8601 format #339

2.1.1.1

Support for monad-control 1.0