#Sqlite database in android studio tutorial pdf code

Just like with serialization, deserialization involves much code that must be kept in sync with the SQL that defines the database manually.Ĭlearly, this approach of working with the database directly is non-optimal. Instantiate new AppMemoryInfo using the values from the previous step.Iterate over the entries stored in the Cursor and pull the stored values from it, one by one.Obtain an instance of Cursor object from the database.Then, when you’d want to deserialize the stored information back from the database, you’d have to go through these steps: Even bigger problem is that the raw SQL code and the serialization logic must be kept in sync with the implementation of AppMemoryInfo manually, by you. Steps #2 and #3 above involve quite a bit of code, and the amount of required code will grow linearly with the number of properties in AppMemoryInfo data structure. Manually serialize AppMemoryInfo into ContentValues data structure, and insert it into the database.Use raw SQL code to create a new table in SQLiteOpenHelper.onCreate() method.Define and initialize SQLiteOpenHelper object.You can use this data structure in your code, but, if you’d like to serialize this information into the database, you’d have to perform these steps, at the very least: Imagine that you have this data class that stores information about app’s memory consumption: data class AppMemoryInfo( To understand why most modern Android projects use Room, let me briefly describe the pain of working with Android’s database directly (the term “directly” might not be the most accurate here because you’d still use helper classes from the Android framework, but I didn’t find a better name). It’s a lightweight relational database that “speaks” SQL language. Direct Integration with a Database in Android AppsĪndroid devices come preinstalled with SQLite3 database.

#Sqlite database in android studio tutorial pdf update

This tutorial explains how you can set up Room in your Android application and perform the basic Create, Read, Update and Delete (CRUD) operations. It enables you to use the local, on-device SQLite database with less boilerplate code and offers runtime safety and a wide range of advanced features. OnCreate() invoked if the database doesn’t exist, meaning the very first time dealing with the SQLite database.Room is the official Object Relational Mapping library for Android, developed and maintained by Google. There are the onCreate() and onUpgrade() methods. It is responsible for opening the database if it exists, creating if it does not exists and upgrading if required. The SQLiteOpenHelper class is used to determine the name and version of the database used in this class.

Three main components are used to handle SQLite operations in Android: SQLiteOpenHelper Class To use the SQLite database in the Android application, the main package will be. For many applications in Android, SQLite is the backbone of the app, whether it’s used directly or via some third-party wrapper. It is better than any other repository systems like SharedPreferences or saving data in files. In Android, whenever an application needs to store a large amount of data the SQLite is the most preferred. You don’t need to establish any connections like JDBC, ODBC, or any other external connection for it, like what you will need to do in java applications. SQLite is a build-in database implementation that comes with Android.

SQLite database supports all the relational database features. SQLite database is an opensource, lightweight, no network access, and standalone SQL database that stores data to a text file on a device. Using android SQLite database I will show you how to perform all the crud operations like Create, Insert, Update, and Delete. In this article, you will learn about the Android SQLite Database in-depth with a good example.