Struct indradb_postgres::PostgresTransaction

pub struct PostgresTransaction { /* fields omitted */ }

A postgres-backed datastore transaction.

Trait Implementations

impl Datastore<PostgresTransaction> for PostgresDatastore

fn transaction(&self) -> Result<PostgresTransaction>

Creates a new transaction.

impl Debug for PostgresTransaction

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Transaction for PostgresTransaction

fn create_vertex(&self, vertex: &Vertex) -> Result<bool>

Creates a new vertex. Returns whether the vertex was successfully created - if this is false, it's because a vertex with the same UUID already exists.

fn get_vertices(&self, q: &VertexQuery) -> Result<Vec<Vertex>>

Gets a range of vertices specified by a query.

fn delete_vertices(&self, q: &VertexQuery) -> Result<()>

Deletes existing vertices specified by a query.

fn get_vertex_count(&self) -> Result<u64>

Gets the number of vertices in the datastore..

fn create_edge(&self, key: &EdgeKey) -> Result<bool>

Creates a new edge. If the edge already exists, this will update it with a new update datetime. Returns whether the edge was successfully created - if this is false, it's because one of the specified vertices is missing.

fn get_edges(&self, q: &EdgeQuery) -> Result<Vec<Edge>>

Gets a range of edges specified by a query.

fn delete_edges(&self, q: &EdgeQuery) -> Result<()>

Deletes a set of edges specified by a query.

fn get_edge_count(     &self,     id: Uuid,     type_filter: Option<&Type>,     direction: EdgeDirection ) -> Result<u64>

Gets the number of edges associated with a vertex.

fn get_vertex_metadata(     &self,     q: &VertexQuery,     name: &str ) -> Result<Vec<VertexMetadata>>

Gets a vertex metadata value.

fn set_vertex_metadata(     &self,     q: &VertexQuery,     name: &str,     value: &JsonValue ) -> Result<()>

Sets a vertex metadata value.

fn delete_vertex_metadata(&self, q: &VertexQuery, name: &str) -> Result<()>

Deletes a vertex metadata value.

fn get_edge_metadata(     &self,     q: &EdgeQuery,     name: &str ) -> Result<Vec<EdgeMetadata>>

Gets an edge metadata value.

fn set_edge_metadata(     &self,     q: &EdgeQuery,     name: &str,     value: &JsonValue ) -> Result<()>

Sets an edge metadata value.

fn delete_edge_metadata(&self, q: &EdgeQuery, name: &str) -> Result<()>

Deletes an edge metadata value.

fn create_vertex_from_type(&self, t: Type) -> Result<Uuid, Error>

Creates a new vertex with just a type specification. As opposed to create_vertex, this is used when you do not want to manually specify the vertex's UUID. Returns the new vertex's UUID.