HGraphStorage-0.0.3: Graph database stored on disk

Safe Haskell	None
Language	Haskell98

Database.Graph.HGraphStorage.Query

Description

Higher level API for querying

Synopsis

Documentation

data RelationDir Source

Direction to follow

Constructors

OUT
IN
BOTH

Instances

Bounded RelationDir
Enum RelationDir
Eq RelationDir
Ord RelationDir
Read RelationDir
Show RelationDir
Typeable * RelationDir

data RelationStep Source

One step in the query

Constructors

RelationStep
Fields rsRelTypes :: [Text] Types of relations to follow (empty -> all) rsDirection :: RelationDir Direction of relation rsTgtTypes :: [Text] Types of objects to retrieve (empty -> all) rsTgtFilter :: GraphObject ObjectID -> Bool Condition to match on objects rsLimit :: Maybe Int Maximum number of relations to follow (limit applies after all other filters)

Instances

Default RelationStep	Default instance: navigates all out links
Typeable * RelationStep

data StepResult Source

Result of a query step

Constructors

StepResult
Fields srRelationID :: RelationID Relation id srDirection :: RelationDir Direction of relation srType :: Text Type of relation srProperties :: Map Text [PropertyValue] Properties of relation srObject :: GraphObject ObjectID Target object

Instances

Eq StepResult
Ord StepResult
Read StepResult
Show StepResult
Typeable * StepResult

queryStep :: GraphUsableMonad m => ObjectID -> RelationStep -> GraphStorageT m [StepResult] Source

Run a one step query on one given object