String WHERE clause: where clause, if none pass null.

String columns: The projection of the query, i.e., the columns to retrieve.

String Table Name: The name of the table to run the query against.

The db.query has the following parameters: Public void onCreate(SQLiteDatabase db) Ĭursor c=db.query(viewEmps, columns, colDeptName+ ' =?', Our class will have the following members:

onUpgrade(SQLiteDatabse db, int oldVersion, int newVersion): invoked when we make a modification to the database such as altering, dropping, creating new tables.

onCreate(SQLiteDatabase db): invoked when the database is created, this is where we can create tables and columns to them, create views or triggers.

This class provides two methods to override to deal with the database: The first step is to create a class that inherits from SQLiteOpenHelper class.

First, we will create a class that handles all the operations required to deal with the database such as creating the database, creating tables, inserting and deleting records and so on. ViewEmps: to display employees and their relative departments.īy default, SQLite on Android does not have a management interface or an application to create and manage databases from, so we're going to create the database ourselves by code.In this tutorial, we will create a simple database application to store employees data. SQLite Full Unicode support is optional and not installed by default.Referential integrity is not maintained in SQLite, there is no FOREIGN KEY constraints or JOIN statements.

Data type integrity is not maintained in SQLite, you can put a value of a certain data type in a column of another datatype (put string in an integer and vice versa).

Things to consider when dealing with SQLite: SQLite is a lightweight transactional database engine that occupies a small amount of disk storage and memory, so it's a perfect choice for creating databases on many mobile operating systems such as Android, iOS.

Sqlite database in android