Indexed db - the store in the browser
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IndexedDB allows for persistent storage of structured data in the browser. It is part of the HTML5 specifications and supports storing objects in an object store similar to tables in a database. Data can be accessed synchronously through web workers or asynchronously through the global window object. Transactions are used to ensure data consistency and cursors allow enumeration over objects.
Indexed db - the store in the browser
- 1. IndexedDBThe Store in your Browser
- 2. Rich Internet Applications (Offline)Should you be online to use Rich Internet Applications? Classes of Applications Intermittently connected applications – Calendar and mail clientsDisconnected applications – Todo Lists or Sticky NotesCaching Data – User profile and shopping catalog cached on the browserComplements AppCache standardsPossibilities todayCookiesLocal/Session StorageWebSQLDatabase / Gears
- 3. Hello {IndexedDB}Persistent Storage in the BrowserPart of the HTML5 set of specificationsStandard still in draftObject Store: non-relational Put and Get ObjectsIterate over objectsIndex on propertiesTwo FlavorsSynchronous – on WebWorkersAsynchronous – on Global Window object
- 4. Concepts + CodeInstallation and Pre RequisitesRequestsDatabase – the place where it is all storedObject StoreStores {Key: Javascript Object} (Structured Cloning Algorithm)Like Tables in the relational worldTransactionsTo ensure consistency Read, Read_Write and Version_ChangeCursorEnumerate over objects using “continue”IndexesStart cursors on other (non primary key) properties of the object