Database.Persist.Postgresql.Internal

Newtype used to avoid orphan instances for postgresql-simple classes.

Represent Postgres interval using NominalDiffTime

Note that this type cannot be losslessly round tripped through PostgreSQL. For example the value PgInterval 0.0000009 will truncate extra precision. And the value PgInterval 9223372036854.775808 will overflow. Use the Interval type if that is a problem for you.

Get the field parser corresponding to the given Oid.

For example, pass in the Oid of bool, and you will get back a field parser which parses boolean values in the table into PersistBools.

Represents a change to a Postgres DB in a statement.

Represents a change to a Postgres table in a DB statement.

Represents a change to a Postgres column in a DB statement.

Indicates whether a Postgres Column is safe to drop.

Returns a structured representation of all of the DB changes required to migrate the Entity from its current state in the database to the state described in Haskell.

Returns a structured representation of all of the DB changes required to migrate the listed entities from their current state in the database to the state described in Haskell. This function avoids N+1 queries, so if you have a lot of entities to migrate, it's much faster to use this rather than using migrateStructured in a loop.

Returns a structured representation of all of the DB changes required to migrate the Entity to the state described in Haskell, assuming it currently does not exist in the database.

Create a table if it doesn't exist.

Get the references to be added to a table for the given column.

Check if a column name is listed as the "safe to remove" in the entity list.