[PDF] Android SQLite database and content provider

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Android SQLite database and content provider

- Tutorial

1. SQLite and Android

o 1.1. What is SQLite? o 1.2. SQLite in Android

2. SQLite architecture

o 2.1. Packages o 2.2. Creating and updating database with SQLiteOpenHelper o 2.3. SQLiteDatabase o 2.4. rawQuery() Example o 2.5. query() Example o 2.6. Cursor o 2.7. ListViews, ListActivities and SimpleCursorAdapter

3. Tutorial: Using SQLite

o 3.1. Introduction to the project o 3.2. Create Project o 3.3. Database and Data Model o 3.4. User Interface o 3.5. Running the apps

4. Content provider and sharing data

o 4.1. What is a content provider? o 4.2. Base URI of the content provider o 4.3. Accessing a content provider o 4.4. Custom content provider o 4.5. Security and content provider o 4.6. Thread Safety

5. Tutorial: Using ContentProvider

o 5.1. Overview o 5.2. Create contacts on your emulator o 5.3. Using the Contact Content Provider

6. Cursors and Loaders

7. Tutorial: SQLite, custom ContentProvider and Loader

o 7.1. Overview o 7.2. Project o 7.3. Database classes o 7.4. Create ContentProvider o 7.5. Resources o 7.6. Layouts o 7.7. Activities o 7.8. Start your application

8. Accessing SQLite databases directly

o 8.1. Storage location of the SQLite database o 8.2. Shell access to the database

9. More on ListViews

10. Performance

11. Get the Book

12. About this website

13. Android SQLite resources

o 13.1. vogella GmbH training and consulting support

Appendix A: Copyright and License

1. SQLite and Android

1.1. What is SQLite?

SQLite is an Open Source database. SQLite supports standard relational database features like SQL

syntax, transactions and prepared statements

SQLite supports the data types:

TEXT (similar to String in Java),

INTEGER (similar to long in Java) and

REAL (similar to double in Java).

All other types must be converted into one of these fields before getting saved in the database.

1.2. SQLite in Android

SQLite is embedded into every Android device. Using an SQLite database in Android does not require a setup procedure or administration of the database. You only have to define the SQL statements for creating and updating the database. Afterwards the database is automatically managed for you by the Android platform.

If your application creates a database, this database is by default saved in the directory

DATA/data/APP_NAME/databases/FILENAME.

The parts of the above directory are constructed based on the following rules. DATA is the path which

the Environment.getDataDirectory() method returns. APP_NAME is your application name. FILENAME is the name you specify in your application code for the database.

2. SQLite architecture

2.1. Packages

The android.database package contains all necessary classes for working with databases. The

android.database.sqlite package contains the SQLite specific classes.

2.2. Creating and updating database with SQLiteOpenHelper

To create and upgrade a database in your Android application you create a subclass of the

SQLiteOpenHelper class. In the constructor of your subclass you call the super() method of

SQLiteOpenHelper, specifying the database name and the current database version. In this class you need to override the following methods to create and update your database. onCreate() - is called by the framework, if the database is accessed but not yet created.

onUpgrade() - called, if the database version is increased in your application code. This

method allows you to update an existing database schema or to drop the existing database and recreate it via the onCreate() method. Both methods receive an SQLiteDatabase object as parameter which is the Java representation of the database. The SQLiteOpenHelper class provides the getReadableDatabase() and getWriteableDatabase() methods to get access to an SQLiteDatabase object; either in read or write mode. The database tables should use the identifier _id for the primary key of the table. Several Android functions rely on this standard. It is good practice to create a separate class per table. This class defines static onCreate() and onUpgrade() methods. These methods are called in the corresponding methods of SQLiteOpenHelper. This way your implementation of SQLiteOpenHelper stays readable, even if you have several tables.

Example

public class MySQLiteHelper extends SQLiteOpenHelper { public static final String TABLE_COMMENTS = "comments"; public static final String COLUMN_ID = "_id"; public static final String COLUMN_COMMENT = "comment"; private static final String DATABASE_NAME = "commments.db"; private static final int DATABASE_VERSION = 1; // Database creation sql statement private static final String DATABASE_CREATE = "create table " + TABLE_COMMENTS + "( " + COLUMN_ID + " integer primary key autoincrement, " + COLUMN_COMMENT + " text not null);"; public MySQLiteHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); @Override public void onCreate(SQLiteDatabase database) { database.execSQL(DATABASE_CREATE); @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

Log.w(MySQLiteHelper.class.getName(),

"Upgrading database from version " + oldVersion + " to " + newVersion + ", which will destroy all old data"); db.execSQL("DROP TABLE IF EXISTS " + TABLE_COMMENTS); onCreate(db);

2.3. SQLiteDatabase

SQLiteDatabase is the base class for working with a SQLite database in Android and provides methods to: open, query, update and close the database. More specifically SQLiteDatabase provides methods to: insert(), update() and delete(). In addition it provides the execSQL() method, which allows to execute an SQL statement directly. The object ContentValues allows to define key/values. The key represents the table column identifier and the value represents the content for the table record in this column. ContentValues can be used for inserts and updates of database entries. Queries can be created via the rawQuery() and query() methods or via the SQLiteQueryBuilder class . rawQuery() directly accepts an SQL select statement as input. query() provides a structured interface for specifying the SQL query. SQLiteQueryBuilder is a convenience class that helps to build SQL queries.

2.4. rawQuery() Example

The following gives an example of a rawQuery() call.

Cursor cursor = getReadableDatabase().

rawQuery("select * from todo where _id = ?", new String[] { id });

2.5. query() Example

The following gives an example of a query() call.

return database.query(DATABASE_TABLE, new String[] { KEY_ROWID, KEY_CATEGORY, KEY_SUMMARY, KEY_DESCRIPTION }, null, null, null, null, null);

The method query() has the following parameters.

Table 1. Parameters of the query() method

Parameter Comment

String dbName The table name to compile the query against.

String[]

columnNames A list of which table columns to return. Passing "null" will return all columns. String whereClause Where-clause, i.e. filter for the selection of data, null will select all data.

String[]

selectionArgs You may include ?s in the "whereClause"". These placeholders will get replaced by the values from the selectionArgs array. String[] groupBy A filter declaring how to group rows, null will cause the rows to not be grouped. String[] having Filter for the groups, null means no filter. String[] orderBy Table columns which will be used to order the data, null means no ordering. If a condition is not required you can pass null, e.g. for the group by clause. The "whereClause" is specified without the word "where", for example a "where" statement might look like: "_id=19 and summary=?".

If you specify placeholder values in the where clause via ?, you pass them as the selectionArgs

parameter to the query.

2.6. Cursor

A query returns a Cursor object. A Cursor represents the result of a query and basically points to one

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[PDF] [PDF] Android SQLite database and content provider - Tutorial

Android SQLite database and content provider

Table of Contents

1. SQLite and Android

2. SQLite architecture

3. Tutorial: Using SQLite

4. Content provider and sharing data

5. Tutorial: Using ContentProvider

6. Cursors and Loaders

7. Tutorial: SQLite, custom ContentProvider and Loader

8. Accessing SQLite databases directly

9. More on ListViews

10. Performance

11. Get the Book

12. About this website

13. Android SQLite resources

Appendix A: Copyright and License

1. SQLite and Android

1.1. What is SQLite?

SQLite supports the data types:

TEXT (similar to String in Java),

INTEGER (similar to long in Java) and

REAL (similar to double in Java).

1.2. SQLite in Android

DATA/data/APP_NAME/databases/FILENAME.

2. SQLite architecture

2.1. Packages

2.2. Creating and updating database with SQLiteOpenHelper

Example

Log.w(MySQLiteHelper.class.getName(),

2.3. SQLiteDatabase

2.4. rawQuery() Example

Cursor cursor = getReadableDatabase().

2.5. query() Example

The following gives an example of a query() call.

The method query() has the following parameters.

Table 1. Parameters of the query() method

Parameter Comment

String[]

String[]

2.6. Cursor