javascript - Asking for help with a question about indexedDB

Question

As shown below, the primary key of a piece of data I stored is timeStamp. What I know is that this data can be found by getting the primary key value, but cannot the data be retrieved by querying other values ​​in it? Can query conditions similar to SQL statements not be implemented? (Find them all and then iterate through the results to eliminate them)

db.createObjectStore('book', {
    keyPath: "timeStamp"
});

store.get(1496251171844)

Some people say to use an index, but the index cannot be queried based on the value. I still need to make a judgment. What I
want is to directly store.get(group) to get the specified object storage. group

 var book = db.createObjectStore('book', {
        keyPath: "timeStamp"
    });
  // 建立索引
book.createIndex("groupId","groupId", {unique:false});
--------------------------------------------------------

html5.indexedDB.getFromId = function(groud, callback){
    var db = html5rocks.indexedDB.db;
    var tx = db.transaction(['book'],'readwrite');
    var store = tx.objectStore('book');

  
    var index = store.index("groupId");
    request = index.openCursor();
    request.onsuccess = function(event){
        var result = event.target.result;
        if(!result){return;}
        if(result.value.groupId == groud){
            callback(result.value);
        }
        result.continue();
    };
};

Answer 1

createIndex can add multiple indexes and set whether the index value is unique

Answer 2

indexedDB is similar to nosql, it can only rely on keyword indexing, and there is no way to query by sql. After obtaining the collection, you can use js method to search.