indexedDB_operations.js

var request=db.transaction(["books","users"],"readwrite");
var bookStore=request.objectStore("books");
bookStore.add({book_name:"Eloquent JavaScript"});
bookStore.add({book_name:"You don't know JS"});
var userStore=request.objectStore("users");
userStore.add({name:"javascript"});
request.oncomplete=()=>{

  let getReq=db.transaction("books","readonly");
  let bookStore=getReq.objectStore("books");
  let nameIndex=bookStore.index("book_name");
  let finalReq=nameIndex.get("Eloquent JavaScript");
  finalReq.onsuccess=()=>{
      console.log(finalReq.result)//The final result.
  }
}
request.onerror=()=>{
  console.log("transaction failed");
}