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Android SQLite Database
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Android SQLite Database

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Questions and Answers

What is SQLite used for on Android devices?

performing database operations such as storing, manipulating, or retrieving persistent data

Which class provides functionality to use SQLite database in Android?

  • SQLiteOpenHelper (correct)
  • SQLiteHandler
  • SQLiteManager
  • SQLiteDatabase

    • What are the two methods provided by SQLiteOpenHelper for database management?

  • createDB(), updateDB()
  • onCreate(), onUpgrade() (correct)
  • onCreate(), onUpdate()
  • initDB(), upgradeDB()

    • SQLiteOpenHelper is responsible for opening, creating, and upgrading databases in Android.

    <p>True</p> Signup and view all the answers

    _____ is a method in SQLiteDatabase class that executes a SQL query.

    <p>execSQL</p> Signup and view all the answers

    What is the primary purpose of the SQLiteOpenHelper class in Android?

    <p>To manage database creation and version management</p> Signup and view all the answers

    What are the two essential methods of the SQLiteOpenHelper class?

    <p>onCreate() and onUpgrade()</p> Signup and view all the answers

    What is the role of the onCreate() method in SQLiteOpenHelper?

    <p>To create a database if it does not exist</p> Signup and view all the answers

    What is the purpose of the onUpgrade() method in SQLiteOpenHelper?

    <p>To upgrade the database to a new version</p> Signup and view all the answers

    What is the significance of the constructor of the SQLiteOpenHelper class?

    <p>It creates an object for creating, opening, and managing the database</p> Signup and view all the answers

    What is the relationship between SQLiteOpenHelper and SQLiteDatabase?

    <p>SQLiteOpenHelper returns a SQLiteDatabase object instance</p> Signup and view all the answers

    Why do you need to subclass SQLiteOpenHelper?

    <p>To create your own custom database helper class</p> Signup and view all the answers

    What is the purpose of the CursorFactory parameter in the SQLiteOpenHelper constructor?

    <p>It specifies the error handler</p> Signup and view all the answers

    What is the purpose of the onCreate method in the SQLiteOpenHelper class?

    <p>It is called only once when the database is created for the first time.</p> Signup and view all the answers

    What is the difference between the onCreate and onUpgrade methods in the SQLiteOpenHelper class?

    <p>The <code>onCreate</code> method is called when the database is created for the first time, while the <code>onUpgrade</code> method is called when the database needs to be upgraded.</p> Signup and view all the answers

    What is the purpose of the close method in the SQLiteOpenHelper class?

    <p>It closes the database object.</p> Signup and view all the answers

    What is the purpose of the execSQL method in the SQLiteDatabase class?

    <p>It executes the SQL query, but not a select query.</p> Signup and view all the answers

    What is the purpose of the insert method in the SQLiteDatabase class?

    <p>It inserts a record into the database.</p> Signup and view all the answers

    What is the purpose of the update method in the SQLiteDatabase class?

    <p>It updates a row in the database.</p> Signup and view all the answers

    What is the purpose of the query method in the SQLiteDatabase class?

    <p>It returns a cursor over the result set.</p> Signup and view all the answers

    What is the purpose of calling moveToFirst() on a Cursor object?

    <p>It allows us to test whether the query returned an empty set and moves the cursor to the first result.</p> Signup and view all the answers

    Study Notes

    SQLite Database

    • SQLite is an open-source relational database used to perform database operations on Android devices, storing, manipulating, or retrieving persistent data from the database.
    • It is embedded in Android by default, eliminating the need for database setup or administration tasks.

    SQLiteOpenHelper Class

    • The SQLiteOpenHelper class provides functionality to use the SQLite database and manages database creation and version management.
    • It provides two methods: onCreate(SQLiteDatabase db) and onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion).
    • The SQLiteOpenHelper class is responsible for opening a database if it exists, creating a database if it doesn't, and upgrading if required.

    Constructors of SQLiteOpenHelper

    • SQLiteOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) creates an object for creating, opening, and managing the database.
    • SQLiteOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version, DatabaseErrorHandler errorHandler) creates an object for creating, opening, and managing the database, specifying an error handler.

    Methods of SQLiteOpenHelper Class

    • onCreate(SQLiteDatabase db) is called only once when the database is created for the first time.
    • onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) is called when the database needs to be upgraded.
    • close() closes the database object.

    SQLiteDatabase Class

    • The SQLiteDatabase class contains methods to be performed on the SQLite database, such as create, update, delete, and select.
    • execSQL(String sql) executes the SQL query, excluding select queries.
    • insert(String table, String nullColumnHack, ContentValues values) inserts a record into the database, specifying the table name and values to be stored.
    • update(String table, ContentValues values, String whereClause, String[] whereArgs) updates a row in the database.
    • query(String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy) returns a cursor over the result set.

    Android SQLite Cursor

    • A Cursor represents the entire result set of the query.
    • moveToFirst() allows us to test whether the query returned an empty set and moves the cursor to the first result when the set is not empty.

    SQLite Database

    • SQLite is an open-source relational database used to perform database operations on Android devices, storing, manipulating, or retrieving persistent data from the database.
    • It is embedded in Android by default, eliminating the need for database setup or administration tasks.

    SQLiteOpenHelper Class

    • The SQLiteOpenHelper class provides functionality to use the SQLite database and manages database creation and version management.
    • It provides two methods: onCreate(SQLiteDatabase db) and onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion).
    • The SQLiteOpenHelper class is responsible for opening a database if it exists, creating a database if it doesn't, and upgrading if required.

    Constructors of SQLiteOpenHelper

    • SQLiteOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) creates an object for creating, opening, and managing the database.
    • SQLiteOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version, DatabaseErrorHandler errorHandler) creates an object for creating, opening, and managing the database, specifying an error handler.

    Methods of SQLiteOpenHelper Class

    • onCreate(SQLiteDatabase db) is called only once when the database is created for the first time.
    • onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) is called when the database needs to be upgraded.
    • close() closes the database object.

    SQLiteDatabase Class

    • The SQLiteDatabase class contains methods to be performed on the SQLite database, such as create, update, delete, and select.
    • execSQL(String sql) executes the SQL query, excluding select queries.
    • insert(String table, String nullColumnHack, ContentValues values) inserts a record into the database, specifying the table name and values to be stored.
    • update(String table, ContentValues values, String whereClause, String[] whereArgs) updates a row in the database.
    • query(String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy) returns a cursor over the result set.

    Android SQLite Cursor

    • A Cursor represents the entire result set of the query.
    • moveToFirst() allows us to test whether the query returned an empty set and moves the cursor to the first result when the set is not empty.

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    Description

    SQLite database usage in Android devices, including database creation and version management. It explains the role of SQLiteOpenHelper class.

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