{"id":26830,"date":"2024-03-16T07:24:40","date_gmt":"2024-03-16T07:24:40","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/using-sqlite-database-in-android\/"},"modified":"2024-03-22T09:32:37","modified_gmt":"2024-03-22T09:32:37","slug":"using-sqlite-database-in-android","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/using-sqlite-database-in-android\/","title":{"rendered":"Using SQLite database in Android"},"content":{"rendered":"

The following steps are required to use SQLite database in Android:<\/p>\n

    \n
  1. To create a database in an Android application, you can use the SQLiteOpenHelper class to create and manage the database. First, create a class that extends SQLiteOpenHelper and override the following methods:<\/li>\n
  2. In the onCreate() method, we create database tables.<\/li>\n
  3. Upgrade database tables in this method, onUpgrade().<\/li>\n
  4. Open the database: Before using the database in the application, it is necessary to open the database first. You can open the database using the getWritableDatabase() method or the getReadableDatabase() method.<\/li>\n
  5. Performing database operations: You can use the methods of the SQLiteDatabase class to perform database operations such as adding, deleting, modifying, and querying data. Some commonly used methods are as follows:<\/li>\n
  6. Execute SQL statement using execSQL().<\/li>\n
  7. insert(): to add data.<\/li>\n
  8. delete(): remove data.<\/li>\n
  9. update(): Data is being updated.<\/li>\n
  10. query(): retrieve data.<\/li>\n
  11. Close database: After the application finishes using the database, it should be closed to release resources. The close() method can be used to close the database.<\/li>\n<\/ol>\n

    Here is a simple example:<\/p>\n

    public<\/span> class<\/span> DBHelper<\/span> extends<\/span> SQLiteOpenHelper<\/span> {\r\n    private<\/span> static<\/span> final<\/span> String<\/span> DATABASE_NAME<\/span> =<\/span> \"mydatabase.db\"<\/span>;\r\n    private<\/span> static<\/span> final<\/span> int<\/span> DATABASE_VERSION<\/span> =<\/span> 1<\/span>;\r\n\r\n    public<\/span> DBHelper<\/span>(Context context)<\/span> {\r\n        super<\/span>(context, DATABASE_NAME, null<\/span>, DATABASE_VERSION);\r\n    }\r\n\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> onCreate<\/span>(SQLiteDatabase db)<\/span> {\r\n        String<\/span> createTableQuery<\/span> =<\/span> \"CREATE TABLE IF NOT EXISTS mytable (id INTEGER PRIMARY KEY, name TEXT)\"<\/span>;\r\n        db.execSQL(createTableQuery);\r\n    }\r\n\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> onUpgrade<\/span>(SQLiteDatabase db, int<\/span> oldVersion, int<\/span> newVersion)<\/span> {\r\n        String<\/span> dropTableQuery<\/span> =<\/span> \"DROP TABLE IF EXISTS mytable\"<\/span>;\r\n        db.execSQL(dropTableQuery);\r\n        onCreate(db);\r\n    }\r\n}\r\n\r\n\/\/ \u4f7f\u7528\u6570\u636e\u5e93<\/span>\r\nDBHelper<\/span> dbHelper<\/span> =<\/span> new<\/span> DBHelper<\/span>(context);\r\nSQLiteDatabase<\/span> db<\/span> =<\/span> dbHelper.getWritableDatabase();\r\n\r\n\/\/ \u63d2\u5165\u6570\u636e<\/span>\r\nContentValues<\/span> values<\/span> =<\/span> new<\/span> ContentValues<\/span>();\r\nvalues.put(\"name\"<\/span>, \"John\"<\/span>);\r\ndb.insert(\"mytable\"<\/span>, null<\/span>, values);\r\n\r\n\/\/ \u67e5\u8be2\u6570\u636e<\/span>\r\nCursor<\/span> cursor<\/span> =<\/span> db.query(\"mytable\"<\/span>, null<\/span>, null<\/span>, null<\/span>, null<\/span>, null<\/span>, null<\/span>);\r\nwhile<\/span> (cursor.moveToNext()) {\r\n    int<\/span> id<\/span> =<\/span> cursor.getInt(cursor.getColumnIndex(\"id\"<\/span>));\r\n    String<\/span> name<\/span> =<\/span> cursor.getString(cursor.getColumnIndex(\"name\"<\/span>));\r\n    Log.d(\"Database\"<\/span>, \"id: \"<\/span> + id + \", name: \"<\/span> + name);\r\n}\r\n\r\n\/\/ \u5173\u95ed\u6570\u636e\u5e93<\/span>\r\ndb.close();\r\n<\/code><\/pre>\n
    This is just a simple example, in actual use, more database operations may be needed. Additionally, attention should be paid to the design of data tables and data handling.<\/p>\n","protected":false},"excerpt":{"rendered":"
    The following steps are required to use SQLite database in Android: To create a database in an Android application, you can use the SQLiteOpenHelper class to create and manage the database. First, create a class that extends SQLiteOpenHelper and override the following methods: In the onCreate() method, we create database tables. Upgrade database tables in […]<\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-26830","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nUsing SQLite database in Android - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/using-sqlite-database-in-android\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Using SQLite database in Android\" \/>\n<meta property=\"og:description\" content=\"The following steps are required to use SQLite database in Android: To create a database in an Android application, you can use the SQLiteOpenHelper class to create and manage the database. 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