update examples

example/nodejs-commonjs/basic-persistent/index.js

@@ -0,0 +1,52 @@
+const { Index } = require("flexsearch");
+const Sqlite = require("flexsearch/db/sqlite");
+// const Postgres = require("flexsearch/db/postgres");
+// const MongoDB = require("flexsearch/db/mongodb");
+// const Redis = require("flexsearch/db/redis");
+// const Clickhouse = require("flexsearch/db/clickhouse");
+
+(async function(){
+
+    // create DB instance with namespace
+    const db = new Sqlite("my-store");
+
+    // create a simple index which can store id-content-pairs
+    const index = new Index({
+        tokenize: "forward"
+    });
+
+    // mount database to the index
+    await index.mount(db);
+    // await index.destroy();
+    // await index.mount(db);
+
+    // some test data
+    const data = [
+        'cats abcd efgh ijkl mnop qrst uvwx cute',
+        'cats abcd efgh ijkl mnop qrst cute',
+        'cats abcd efgh ijkl mnop cute',
+        'cats abcd efgh ijkl cute',
+        'cats abcd efgh cute',
+        'cats abcd cute',
+        'cats cute'
+    ];
+
+    // add data to the index
+    data.forEach((item, id) => {
+        index.add(id, item);
+    });
+
+    // transfer changes (bulk)
+    await index.commit();
+
+    // perform query
+    const result = await index.search({
+        query: "cute cat"
+    });
+
+    // display results
+    result.forEach(i => {
+        console.log(data[i]);
+    });
+
+}());