DataScript class

Constructors

DataScript()

Properties

connections → List
Returns connections ids.
no setter
context ↔ JsContext
getter/setter pair
databases → List
Returns database ids.
no setter
hashCode → int
The hash code for this object.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

connFromDatoms(dynamic dataoms, {Schema? schema}) → JsRef
Creates an empty JsRef and a mutable reference to it. See createConn.
connFromDb(JsRef db) → JsRef
Creates a mutable reference to a given immutable database. See createConn.
createConn({Schema? schema}) → JsRef
Creates a mutable reference (a “connection”) to an empty immutable database inside JsRuntime.
datoms(JsRef db, String index, Object? c1, Object? c2, Object? c3, Object? c4) → dynamic
Index lookup. Returns a sequence of datoms (lazy iterator over actual Db index) which components (e, a, v) match passed arguments.
db(JsRef conn) → JsRef
Creates the underlying immutable database from a connection.
dbWith(JsRef db, List entities) → Future<JsRef>
Applies transaction to an immutable db value, returning new immutable db value. Same as (:db-after (with db tx-data)).
emptyDb({Schema? schema}) → JsRef
Creates an empty database with an optional schema.
entity(JsRef db, dynamic eid) → Entity
Retrieves an entity by its id from database. Entities are lazy map-like structures to navigate DataScript database content.
entityDb(Entity e) → JsRef
Returns a db that entity was created from.
filter(dynamic db, dynamic pred) → Future
Returns a view over database that has same interface but only includes datoms for which the (pred db datom) is true. Can be applied multiple times.
fromSerializable(dynamic serializable, dynamic opts) → Future
Creates db from a data structure (not string!) produced by serializable.
indexRange(JsRef db, dynamic attr, dynamic start, dynamic end) → Future
Returns part of :avet index between [_ attr start] and [_ attr end] in AVET sort order.
initDb(dynamic datoms, {Schema? schema}) → JsRef
Low-level fn for creating database quickly from a trusted sequence of datoms.
isFiltered(JsRef db) → Future<bool>
Returns true if this database was filtered using [filter], false otherwise."
listen(JsRef conn, String key, void callback(dynamic)) → dynamic
Listen for changes on the given connection.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
pull(JsRef db, dynamic pattern, dynamic lookup) → Future
Fetches data from database using recursive declarative description. See docs.datomic.com/on-prem/pull.html.
pullMany(JsRef db, dynamic pattern, List lookup) → Future
Same as pull, but accepts sequence of ids and returns sequence of maps.
q(String query, List inputs) → Future
Executes a datalog query. See docs.datomic.com/on-prem/query.html
resetConn(JsRef conn, JsRef db, {dynamic txMeta}) → dynamic
Forces underlying conn value to become db. Will generate a TxReport that will remove everything from old value and insert everything from the new one."
resolveTempid(Map tempids, dynamic tempid) → dynamic
Does a lookup in tempids map, returning an entity id that tempid was resolved to.
seekDatoms(dynamic db, dynamic index, Object? c1, Object? c2, Object? c3, Object? c4) → dynamic
Similar to [datoms], but will return datoms starting from specified components and including rest of the database until the end of the index.
serializable(dynamic db, Object? opts) → Future
Converts db into a data structure (not string!) that can be fed to serializer of your choice (e.g. js/JSON.stringify in CLJS, cheshire.core/generate-string or jsonista.core/write-value-as-string in CLJ).
squuid({int? msec}) → Future<String>
Generates a UUID that grow with time. Such UUIDs will always go to the end of the index and that will minimize insertions in the middle.
squuidTimeMillis(dynamic uuid) → Future<int>
Returns time that was used in [squuid] call, in milliseconds, rounded to the closest second.
toString() → String
A string representation of this object.
inherited
touch(Entity e) → List
Forces all entity attributes to be eagerly fetched and cached. Only usable for debug output.
transact(JsRef conn, List txData, {dynamic txMeta}) → Future<TxReport>
Applies transaction the underlying database value and atomically updates connection reference to point to the result of that transaction, new db value.
unListen(JsRef conn, String key) → dynamic
Removes registered listener from connection. See also [listen!].

Operators

operator ==(Object other) → bool
The equality operator.
inherited