Sql data base
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SQLite is an open-source embedded database initially designed by D. Richard Hipp for resource-constrained environments. It is the primary database used in Android due to its lightweight nature and built-in support, enabling simple queries and ease of implementation. Key features include ACID transactions, portability, and minimal size, although it faces limitations such as high concurrency and lack of access control interfaces.
![Feature of SQLite
• Application file format – Transactions guarantee ACID
[Atomicity, Consistency , Isolation, Durability] even after
system crashes and power failures.
• Temporary data analysis – Command line client, import
CSV files and use sql to analyze & generate reports .
• Embedded devices – Applicable to small, reliable and
portable like mobiles.
• Portable - uses only ANSI-standard C and VFS, file format
is cross platform (little vs. big endian, 32 vs. 64 bit)](https://image.slidesharecdn.com/sqldatabase-180713054513/85/Sql-data-base-4-320.jpg)
Sql data base
- 1. Android SQLite Created By S. Ali Jafar
- 2. History of SQLite • SQlite is an open source embedded database. The original implementation was designed by D. Richard Hipp. • Hipp was designing software used on board guided missile systems and thus had limited resources to work with. • The resulting design goals of SQLite were to allow the program to be operated without a database installation or administration.
- 3. Why Sqlite Only???? • In android we will use Sqlite database only . Because it is in built DB in Android SDK more over it is lite weighted relation DB suitable for Mobile Devices. • We need not to load any drivers and we need not to install the Sqlite separately . • The queries also simple to understand and easy to implement.
- 4. Feature of SQLite • Application file format – Transactions guarantee ACID [Atomicity, Consistency , Isolation, Durability] even after system crashes and power failures. • Temporary data analysis – Command line client, import CSV files and use sql to analyze & generate reports . • Embedded devices – Applicable to small, reliable and portable like mobiles. • Portable - uses only ANSI-standard C and VFS, file format is cross platform (little vs. big endian, 32 vs. 64 bit)
- 5. Feature of SQLite • Reliable – has 100% test coverage, open source code and bug database, transactions are ACID even if power fails. • Small – 300 kb library, runs in 16kb stack and 100kb heap. • Single Database File – An SQLite database is a single ordinary disk file that can be located anywhere in the directory hierarchy . • Readable source code – The source code to SQLite is designed to be readable and accessible to the average programmer .
- 6. Disadvantages High concurrency – reader/writer locks on the entire file. Huge datasets – DB file can’t exceed file system limit or 2TB. Access control – we don’t have any user interface to operate Sqlite database objects as in MYSQL / SQL Server/Oracle. All the objects are virtual. However there are few third party UI are available in the market.
- 7. SQLite Classes • SQLiteCloseable - An object created from a SQLiteDatabase that can be closed. • SQLiteCursor - A Cursor implementation that exposes results from a query on a SQLiteDatabase. • SQLiteDatabase - Exposes methods to manage a SQLite database. • SQLiteOpenHelper - A helper class to manage database creation and version management. • SQLiteProgram - A base class for compiled SQLite programs. • SQLiteQuery - A SQLite program that represents a query that reads the resulting rows into a CursorWindow. • SQLiteQueryBuilder - a convenience class that helps build SQL queries to be sent to SQLiteDatabase objects. • SQLiteStatement - A pre-compiled statement against a SQLiteDatabase that can be reused.
- 8. SQLite OpenHelper Class • SQLite OpenHelper is a class to manage database creation and version management. • This class take care of opening the database if it exists, creating it if it does not, and upgrading it as necessary. • This is for creating db “ onCreate(SQLiteDataBase)”. • When the database needs to be upgraded “ onUpgrade (SQLiteDataBase db, int oldVersion, int newVersion)”. • When the database has been opened “onOpen (SQLiteDataBase db)”.
- 14. Steps in working with Sqlite database: Creating Sqlite Object Creating Database Creating Table Working with Tab
- 15. Step:1 Importing package “android.database.sqlite.SQLiteDatabase”. Step:2 Creating object SQLiteDatabase object name= ;
- 16. Example To Do: • mydb=openOrCreateDatabase("DatabaseName5", MODE_PRIVATE,null); • Example • //mydb is sqlite object name . • //DatabaseName5 is nothing but database name • //MODE_PRIVATE is permissions of a table accessing
- 17. Example To Do: mydb.execSQL("CREATE TABLE IF NOT EXISTS “ +TableName+" (ColumnName DataType);")
- 18. Example To Do: Create: • mydb.execSQL("CREATE TABLE IF NOT EXISTS “ • +TableName+" (ColumnName DataType);"); Alter: • ALTER TABLE TableName RENAME TO new-table-name Drop: • DROP TABLE TableName • (View Source)
- 19. Example To Do: Select: • Cursor c=mydb.rawQuery("SELECT * FROM "+TableName+" • where Name='"+city+"'",null); Insert: • mydb.execSQL("INSERT INTO "+TableName+“ (Name, Area)“ + • "VALUES ('RedFort','40.8 acres‘);"); Delete: • mydb.execSQL(“Delete"+TableName);