What is Android execSQL?

What does DB execSQL return?

Because execSQL() method has no return value. Alternatively, you can use rawQuery() or query() method of SQLiteDatabase class to select and query data.

What is the use of SQLite database in Android?

SQLite Database is an open-source database provided in Android which is used to store data inside the user’s device in the form of a Text file. We can perform so many operations on this data such as adding new data, updating, reading, and deleting this data.

What is RawQuery in Android SQLite?

Marks a method in a Dao annotated class as a raw query method where you can pass the query as a SupportSQLiteQuery . … On the other hand, RawQuery serves as an escape hatch where you can build your own SQL query at runtime but still use Room to convert it into objects. RawQuery methods must return a non-void type.

What is openOrCreateDatabase?

openOrCreateDatabase method is used to create a new database if it is not exists, or to open the existing database at the provided location. … It is recommended to keep the database file as a private file of the application. The third parameter is a reference for CursorFactory object.

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What is execSQL?

execSQL(String sql) Execute a single SQL statement that is NOT a SELECT or any other SQL statement that returns data. void. execSQL(String sql, Object[] bindArgs) Execute a single SQL statement that is NOT a SELECT/INSERT/UPDATE/DELETE.

What is the difference between query and RawQuery in Android?

RawQuery is for people who understand SQL and aren’t afraid of it, query is for people who don’t.

What are the advantages of using SQLite?

Cross-platform DBMS. Available on both UNIX (Linux, Mac OS-X, Android, iOS) and Windows (Win32, WinCE, WinRT). No compatibility issue with any programming languages.

Reliable:

  • Contents are continuously updated.
  • Less bug-prone than custom-written I/O code files.
  • Smaller queries than equivalent procedural codes.

Where does SQLite store data in Android?

The Android SDK provides dedicated APIs that allow developers to use SQLite databases in their applications. The SQLite files are generally stored on the internal storage under /data/data/<packageName>/databases.

What is SQLite vs MySQL?

SQLite is a server-less database and is self-contained. This is also referred to as an embedded database which means the DB engine runs as a part of the app. On the other hand, MySQL requires a server to run. MySQL will require a client and server architecture to interact over a network.

What is a cursor in Android?

Cursors are what contain the result set of a query made against a database in Android. The Cursor class has an API that allows an app to read (in a type-safe manner) the columns that were returned from the query as well as iterate over the rows of the result set.

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What is cursor factory in sqlite Android?

android.database.sqlite.SQLiteDatabase.CursorFactory. Used to allow returning sub-classes of Cursor when calling query.

What is selectionArgs Android?

selectionArgs replace any question marks in the selection string. for example: String[] args = { “first string”, “second@string.com” }; Cursor cursor = db.query(“TABLE_NAME”, null, “name=? AND email=?”, args, null);