stillbargains.blogg.se - Android sqlite database example

ANDROID SQLITE DATABASE EXAMPLE INSTALL
ANDROID SQLITE DATABASE EXAMPLE UPGRADE
ANDROID SQLITE DATABASE EXAMPLE FOR ANDROID
ANDROID SQLITE DATABASE EXAMPLE ANDROID

This is where the Cursor comes in, the list of the items that you queries for are wrapped in a Cursor and the Cursor hands them over to you in batches of any number.

ANDROID SQLITE DATABASE EXAMPLE ANDROID

If that list is so long, your Android device may choke if you want to access all of the items in the returned result. That access is called a query and a successful query will return a list of the items you queried for.

Cursor – The reason you store your data in a database is so you can access them later.

And the way SQLiteOpenHelper knows that you are ready to use your database is when you access that database either with getReadableDatabase() or getWritableDatabase() for read and write operations respectively. When you created your database with SQLiteOpenHelper class, it sets everything in motion to create your database but holds off until you are ready to use that database.

SQLiteDatabase – this is the actual database where your data is stored.

ANDROID SQLITE DATABASE EXAMPLE INSTALL

In other words, SQLiteOpenHelper removes the effort required to install and configure database in other systems.

ANDROID SQLITE DATABASE EXAMPLE UPGRADE

You will use SQLiteOpenHelper to create and upgrade your SQLite Database.

SQLiteOpenHelper – this is the most important class that you will work with in Android SQLite.

This point is not lost on the designers of Android so they created helper classes that makes it easier to get started with SQLite in Android, so let us briefly examine those classes. So SQLite is easy – right? – yes, Android SQLite is easy to use! However “easy” maybe relative, what is relatively easy to you maybe challenging for me. These are called mobile backend as a service or MBASS.

MBASS – if you do not want to become a system admin in other to implement network storage in your Android app then you may want to save time and effort by using one of the available commercial services that provides network storage and some other utilities to mobile apps.

If the network that you want to access from your Android app is yours then that data has to be formatted into or presented by a web service.

REST – it is likely that you will be accessing your networked data store from Android using the internet. REpresentational State Transfer (REST) is a common standard that you can follow to access network resources from your Android app over HTTP which is the data transfer protocol of the internet.

There are a few terminology associated with network data access in Android.

Network – in some cases you may have data that is not efficient to store in the local device and in such case storing the data on the network is an option.Device Storage – if you want to save the pictures of your recent trip to your device? it maybe hard to reduce these to the units that Shared Preference can handle, in this case you can simple dump those large data on the device storage.If you place an order from an online store, your order number is a primitive because it is a Long, or Double, you cannot directly save your Order because it is not a native Java data type. Primitive data types are data that has been decomposed into units that are native to the programming language (Java in this case). Shared Preference – this tools is used to save primitive data in Android.SQLite is not the only way to save data in Android, there are other options and each has its own use case. For you as a developer the biggest benefit of using SQLite in Android is the small number of installation steps required to install SQLite in Android – the actual number of steps to install SQLite in Android is zero because it is already installed.

ANDROID SQLITE DATABASE EXAMPLE FOR ANDROID

The designers of Android chose SQLite to be the main data persistence component for Android because of its easy of use, cost, licensing among other reasons. SQLite predates Android, it is used in other major applications other than Android. And what is data persistence you may ask? data persistence is a fancy and more technically correct way of saying data storage. The data you persist are the data that you do not want to loose each time the users of your app close the app. So SQLite is some type of database, why do we need it in Android? well we use it for data persistence in Android.