deno example

Signed-off-by: Prabhu Subramanian <[email protected]>

Author: prabhu

Diff for: README.md

@@ -227,6 +227,10 @@ if db_lib.needs_update():
 
 Refer to the [readme](./contrib/mcp-server-vdb/README.md)
 
+## Read .vdb6 files in other languages
+
+.vdb6 files are standard SQLite database files. Use any modern sqlite library to read and query them. There is a mini [deno example](./contrib/deno-vdb/README.md) in this repo for demonstration.
+
 ## License
 
 MIT

Diff for: contrib/deno-vdb/README.md

@@ -0,0 +1,16 @@
+# Introduction
+
+Mini example to read sqlite data in deno.
+
+## Pre-requisites
+
+```shell
+export VDB_HOME=$HOME/vdb
+vdb --download-image
+```
+
+## Usage
+
+```shell
+deno run --allow-read --allow-write --allow-env --allow-net --allow-ffi main.ts
+```

Diff for: contrib/deno-vdb/deno.json

@@ -0,0 +1,9 @@
+{
+  "tasks": {
+    "dev": "deno run --watch main.ts"
+  },
+  "imports": {
+    "@std/assert": "jsr:@std/assert@1",
+    "@db/sqlite": "jsr:@db/[email protected]"
+  }
+}

Diff for: contrib/deno-vdb/deno.lock

@@ -0,0 +1,28 @@
+import { Database } from "@db/sqlite";
+import * as path from "jsr:@std/path";
+
+const vdbHome = Deno.env.get("VDB_HOME");
+const indexDBFile = path.join(vdbHome, "data.index.vdb6");
+const cveDBFile = path.join(vdbHome, "data.vdb6");
+
+const indexDB = new Database(indexDBFile);
+const cveDB = new Database(cveDBFile);
+
+if (import.meta.main) {
+  const [indexCount] = indexDB.prepare("SELECT count(*) FROM cve_index").value<number>()!;
+  const [cveDBCount] = cveDB.prepare("SELECT count(*) FROM cve_data").value<number>()!;
+  console.log(`Index count: ${indexCount}, VDB count: ${cveDBCount}`);
+
+  console.log("Index Data");
+  const rows = indexDB.prepare("SELECT cve_id, type, namespace, name, vers, purl_prefix FROM cve_index LIMIT 10").all();
+  for (const row of rows) {
+    console.log(row);
+  }
+
+  // Use json(source_data) to read jsonb columns
+  console.log("CVE Data");
+  const vrows = cveDB.prepare("SELECT cve_id, type, namespace, name, json(source_data) as source_data, source_data_hash FROM cve_data LIMIT 10").all();
+  for (const row of vrows) {
+    console.log(row);
+  }
+}