Package migration contains functions for generating and finding PostgreSQL database migrations.
Generator returns a function that creates migration files at the given base path.
LastRun returns the last migration directory by lexical order that exists in the database and on disk.
Setup creates a migrations table with the given name.
type RunStatus int
RunStatus is a type that indicates if a migration has been run, not run, or if we can't determine the status.
Valid RunStatus values. For more information see RunStatus.
WalkFunc is the type of the function called for each file or directory visited by a Walker.
Walker is a function that can be used to walk a filesystem and calls WalkFunc for each migration.
NewWalker queries the database for migration status information and returns a function that walks the migrations it finds on the filesystem in lexical order (mostly, keep reading) and calls a function for each discovered migration, passing in its name, status, and file information.
If a migration exists in the database but not on the filesystem, info will be nil and f will be called for it after the migrations that exist on the filesystem. No particular order is guaranteed for calls to f for migrations that do not exist on the filesystem.
If NewWalker returns an error and a non-nil function, the function may still be used to walk the migrations on the filesystem but the status information may be wrong since the DB may not have been queried successfully.