Overview

Label existence checking operations provide a lightweight and efficient way to verify whether specific labels exist in your graph database without retrieving their full data. This functionality is essential for validation, conditional operations, and optimizing API calls by avoiding unnecessary data transfer. Understanding label existence checking is crucial for building robust applications that need to validate label presence before performing operations.

Key capabilities include:

Checking label existence using lightweight HEAD requests
Validating label GUIDs before performing operations
Optimizing API calls by avoiding full label data retrieval
Supporting conditional logic based on label presence
Providing fast existence verification for large label datasets

These operations support various use cases such as label data validation, conditional processing, API optimization, and building robust error handling mechanisms.

Check Label Existence

Check if a label exists using HEAD: /v1.0/tenants/{tenant-guid}/labels/{label-guid}. This endpoint performs a lightweight existence check without returning the label data, making it ideal for validation and conditional operations.

curl --location --head 'http://localhost:8701/v1.0/tenants/00000000-0000-0000-0000-000000000000/labels/00000000-0000-0000-0000-000000000000' \
--header 'Authorization: ••••••'

import { LiteGraphSdk } from "litegraphdb";

var api = new LiteGraphSdk(
  "http://localhost:8701/",
  "<Tenant-Guid>",
  "*******"
);

const existsLabel = async () => {
  try {
    const data = await api.Label.exists("<label-guid>");
    console.log(data, "check data");
  } catch (err) {
    console.log("err:", JSON.stringify(err));
  }
};

import litegraph

sdk = litegraph.configure(
    endpoint="http://localhost:8701",
    tenant_guid="Tenant-Guid",
    access_key="******",
)

def exists_label():
    exists = litegraph.Label.exists(guid="label-guid")
    print(exists)

exists_label()

using LiteGraph;
using LiteGraph.GraphRepositories.Sqlite;

LiteGraphClient liteGraph = new LiteGraphClient(new SqliteGraphRepository("litegraph.db"));
liteGraph.InitializeRepository();
bool exists = liteGraph.Label.ExistsByGuid(Guid.Parse("<tenant-guid>"), 
                                           Guid.Parse("<lable-guid>"));

Response

The API returns different status codes based on label existence:

200 OK: Label exists and is accessible
404 Not Found: Label does not exist or is not accessible