selectionArgs String: You may include ?s in selection, which will be replaced by the values from selectionArgs, in order that theyĪppear in the selection.Null will return all rows for the given table.

selection String: A filter declaring which rows to return, formatted as an SQL WHERE clause (excluding the WHERE itself).Passing null will return all columns, which is discouraged to prevent reading dataįrom storage that isn't going to be used. columns String: A list of which columns to return.table String: The table name to compile the query against.new String Ĭursor cursor = db.query(table, columns, selection, selectionArgs, groupBy, having, orderBy, limit).null for all columns as in SELECT * FROM.Once loaded, modify the code to add the appropriate data members and methods: package com.ebookfrenzy. Once created the Product.java source file will automatically load into the Android Studio editor. From the popup menu, choose the New -> Java Class option and, in the Create New Class dialog, name the class Product before clicking on the OK button. Within Android Studio, navigate within the Project tool window to app -> java and right-click on the package name. Essentially, this class can be thought of as representing the database model.

Instances of this class can then be created within the activity and database handler and passed back and forth as needed. This is actually a very simple class capable of holding product ID, product name and product quantity values, together with getter and setter methods for accessing these values. In order to implement this interaction in a structured way, a third class will need to be implemented to hold the database entry data as it is passed between the activity and the handler.

The database handler will be a subclass of SQLiteOpenHelper and will provide an abstract layer between the underlying SQLite database and the activity class, with the activity calling on the database handler to interact with the database (adding, removing and querying database entries). Once completed, the application will consist of an activity and a database handler class.

Sqlitedatabase query