I os webkit sq-lite - ios 5.1 bug en
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SQLite is used as the backend database for WebKit features like cookies, localStorage. In iOS 5.1, the default directory for SQLite databases used by WebKit changed, but the path is not updated when an app is upgraded, causing the databases to no longer be found. Developers need to explicitly set the database directory to avoid this issue and ensure local data is not lost when users upgrade their device to iOS 5.1 or later.
![SQLite default directory
Previous to iOS 5.1
• [app path]/Library/Webkit/Databases
• Can be changed in NSUserDefaults
• WebDatabaseDirectory
• It used to be empty by default](https://image.slidesharecdn.com/ioswebkit-sqlite-ios5-1bugen-121030095319-phpapp01/85/I-os-webkit-sq-lite-ios-5-1-bug-en-4-320.jpg)
![SQLite default directory
From iOS 5.1
• WebDatabaseDirectory is now set to
• [app path]/Library/Caches
• You can still change it
• When iOS is upgraded the old version is not
moved. It's deleted! :(
• The problem also affects to LocalStorage](https://image.slidesharecdn.com/ioswebkit-sqlite-ios5-1bugen-121030095319-phpapp01/85/I-os-webkit-sq-lite-ios-5-1-bug-en-5-320.jpg)
I os webkit sq-lite - ios 5.1 bug en
- 1. SQLite & WebKit Ricardo Salazar @risalba
- 2. WebKit persistence • Cookies • LocalStorage • SQLite
- 3. WebKit & SQLite • Easy to use asynchronous SQL Api
- 4. SQLite default directory Previous to iOS 5.1 • [app path]/Library/Webkit/Databases • Can be changed in NSUserDefaults • WebDatabaseDirectory • It used to be empty by default
- 5. SQLite default directory From iOS 5.1 • WebDatabaseDirectory is now set to • [app path]/Library/Caches • You can still change it • When iOS is upgraded the old version is not moved. It's deleted! :( • The problem also affects to LocalStorage
- 6. iOS 5.1 bug related to WebKit persistence • When an App is updated it's absolute path changes • WebDatabaseDirectory setting doesn't update automatically to the new path :S • Your WebKit based apps can't open their BBDD • And again, the problem affects to LocalStorage too (WebKitLocalStorageDatabasePathPreferenceKey)
- 7. How to fix it? • Always set the WebDatabaseDirectory setting to something else than .../Library/Webkit/Databases or .../Library/Webkit/Databases • If the device is running iOS 5.1 change the LocalStorage Setting too (WebKitLocalStorageDatabasePathPreferenceKey) • You can't change it in previous versions, the data will be lost when the user upgrades :(