Android database tutorial

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Android Database TutorialAndroid Database ToolsThe first tool is SQLiteOpenHelper – which is responsible for creating, opening, and upgrading a program’sdatabase.

Introduction

1. Android Application Development Training Tutorial For more info visit http://www.zybotech.in A7, Stephanos Tower, Eachamukku, Kakkanadu,Kochi

2. Android Database TutorialAndroid Database ToolsThe first tool is SQLiteOpenHelper – which is responsible for creating, opening, and upgrading a program’sdatabase. The other tool is SQLiteDatabase – which is responsible for communicating changes to the datawithin the database. In this tutorial, first go about creating a database manager class that can be modified andplugged into most apps. This program will make use of both the SQLiteOpenHelper and the SQLiteDatabaseclasses. Afterwards, create a simple application that will instantiate and use our new database manager class.Setting Up the SQLiteOpenHelper for UseHow our classes are layed outThe first thing is extend the SQLiteOpenHelper class so that it creates our database with the appropriatestructure that our application needs. The SQLiteOpenHelper class is abstract. This means we need to extend theclass with a concrete class, overriding the appropriate methods. We also need to make available to this class adatabase name, table name, and column names. The best way to handle the variables is with constants.Constants ensure that the correct names are always used.The SQLiteOpenHelper class internal to our database manager class. All of database constants will be insidethe database manager class so they are accessible from both our SQLiteOpenHelper class and our maindatabase class. This setup may not be common practice; easier to work with. The SQLDatabase object,responsible for communicating with the database, is also going to be in the database manager class. This wayall of our resources are available throughout the manager class.How our database is structuredIn this a single table with three columns: one column is the row id (id), and the other two columns are Strings(table_row_one and table_row_two). All of these column names as well as a database version number (more ondatabase version later) are going to be constants.Our base class containing database constants, a SQLDatabase object, and an internal class that extendsSQLiteOpenHelper. A7, Stephanos Tower, Eachamukku, Kakkanadu,Kochi

3. AABDatabaseManager.javaimport android.database.sqlite.SQLiteOpenHelper;public class AABDatabaseManager{ private SQLiteDatabase db; // a reference to the database manager class. private final String DB_NAME = "database_name"; // the name of our database private final int DB_VERSION = 1; // the version of the database // the names for our database columns private final String TABLE_NAME = "database_table"; private final String TABLE_ROW_ID = "id"; private final String TABLE_ROW_ONE = "table_row_one"; private final String TABLE_ROW_TWO = "table_row_two"; // TODO: write the constructor and methods for this class // the beginnings our SQLiteOpenHelper class private class CustomSQLiteOpenHelper extends SQLiteOpenHelper { // TODO: override the constructor and other methods for the parent class }}Now customize the helper class to create our database according to specification.Overriding the SQLiteOpenHelper methods.SQLiteOpenHelper has to know how to design the database. By overriding the onCreate() method with theproper code for creating the database. It’s as simple as creating a SQLite query string and passing it to theSQLiteDatabase object (db). SQLite query structure is out of scope for discussion here so I will not go intodetail here.The SQLite query String needs to read: A7, Stephanos Tower, Eachamukku, Kakkanadu,Kochi

Android database tutorial

Android database tutorial Posted on 23-03-2014  Android Database TutorialAndroid Database ToolsThe first tool is SQLiteOpenHelper – which is responsible for creating, opening, and upgrading a program’sdatabase. 5/10 727

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