JavaScript Adding an index to an existing object store in IndexedDB adding index to existing table sql server,adding index to

How do I add an index to a previously created object store, within the upgrade needed event?

Doing this on a new object store is well documented:

request.onupgradeneeded = function(event) {
  var db = event.target.result;
  var objectStore = db.createObjectStore("my-store",
    { keyPath: "id" }
  );
  objectStore.createIndex("idx_name", "index_this", { unique: false });
};

But how can I add an index to an object store that I previously created?

request.onupgradeneeded = function(event) {
  var db = event.target.result;
  if (!db.objectStoreNames.contains("my-store")) {
    var objectStore = db.createObjectStore("my-store",
      { keyPath: "id" }
    );
  }
  var myStore = ?????????????;
  if (!myStore.indexNames.contains("idx_name")) {
    myStore.createIndex("idx_name", "index_this", { unique: false });
  }
};
Answer:1

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