Programming HTML5 Applications by Zachary Kessin

Author:Zachary Kessin
Language: eng
Format: epub, pdf
ISBN: 9781449322724
Publisher: O'Reilly Media

Retrieving Data

After data has been added to an object store, there must be a way to query and display it. There are several ways of interest to query data. The program may wish to display all the data, a subset of the data, or just one row.

To retrieve one row, identified by its primary key, use the get method as shown in Example 5-7. This method returns a promise object which is accessed via the then method. The then takes two functions as callbacks: the first is called on success with the object from the database, and the second, in case of error, with an error object.

Example 5-7. Get one row

$.indexeddb(db).objectStore(objectStore).get(primaryKey).then(wrap, err);

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